iOS開發中經常使用的方法

系統彈窗:

過時方法：
UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"確認報價" message:@"報價不可修改" delegate:nil cancelButtonTitle:@"好的" otherButtonTitles: nil];
// 顯示出來
[alertView show];
新方法：
UIAlertController* alter = [UIAlertController alertControllerWithTitle:@"註銷帳戶" message:nil preferredStyle:UIAlertControllerStyleActionSheet];
UIAlertAction* action1 = [UIAlertAction actionWithTitle:@"確認退出" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {
      //填寫處理邏輯
    }];
UIAlertAction* action2 = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
      //填寫處理邏輯
    }];
[alter addAction:action1];
[alter addAction:action2];
//彈出選擇框
[self presentViewController:alter animated:YES completion:nil];

定時器:

延遲調用方法一:
[self performSelector:@selector(nextQuestion:) withObject:nil afterDelay:2.0];
延遲調用方法二：
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ 
    //須要調用的方法
});
定時器一：（精確度通常）:
NSTimer *timer = [NSTimer timerWithTimeInterval:2.0 target:self selector:@selector(方法名) userInfo:nil repeats:YES];
NSRunLoop *runLoop = [NSRunLoop mainRunLoop];
[runLoop addTimer:timer forMode:NSRunLoopCommonModes];
定時器二：（精確度高）:
//1.建立CADisplayLink
    CADisplayLink *link = [CADisplayLink displayLinkWithTarget:self selector:@selector(方法名)];
//2.添加到運行循環
    [link addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];

計算控件尺寸:

- (CGSize)stringSize:(NSString *) string andMaxSize:(CGSize)maxSize andFontNum:(NSInteger)fontNum{
// 最大尺寸   
  NSDictionary *dict = @{NSFontAttributeName : [UIFont systemFontOfSize:fontNum] };     
  CGRect labelFrame =  [string boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:dict context:nil];     
// 獲取 size並返回
  return labelFrame.size;
}

通知相關：

發送通知
    NSNotificationCenter* center = [NSNotificationCenter defaultCenter];
    [center postNotificationName:@"OpenButtonNotification" object:nil userInfo:@{@"headerView":self}];
接收通知
    NSNotificationCenter* center = [NSNotificationCenter defaultCenter];
    [center addObserver:self selector:@selector(方法名:) name::@"OpenButtonNotification" object:nil];
註銷通知
-(void)dealloc{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

 TableView相關:

自動行高(須要配合autolayout自動佈局)
self.tableView.estimatedRowHeight = 200; //預估行高
self.tableView.rowHeight = UITableViewAutomaticDimension;

tableViewCell左滑功能
//tableView向左滑的功能
-(void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath{   
  self.tableView.editing = !self.tableView.editing;
  ChangeInfosController* changeInfo = [[ChangeInfosController alloc]init];   
  [self.navigationController pushViewController:changeInfo animated:YES];
}
//修改左滑的文字
-(NSString*)tableView:(UITableView *)tableView titleForDeleteConfirmationButtonForRowAtIndexPath:(NSIndexPath *)indexPath{   
    return @"編輯";
}
取消重用
NSString*CellIdentifier = [NSStringstringWithFormat:@"Cell%ld%ld", (long)[indexPath section], (long)[indexPath row]];
//以indexPath來惟一肯定cell
FillOrderCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
//出列可重用的cell    if (cell == nil) {       
cell = [[FillOrderCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];

CollectionView相關：

自定義layout的三個步驟(流水佈局)：
1、準備數據,並保存到佈局對象數組
- (void)prepareLayout{   
    [super prepareLayout]; 
    //準備item的數據 
    //定義數組用來保存每一個item的frame
    NSMutableArray* marr = [NSMutableArray array];
    //給每一個item佈局   
    for (int i = 0; i < self.clothesInfos.count; i ++)  {       
    //建立佈局對象       
    NSIndexPath* indexPath = [NSIndexPath indexPathForRow:i inSection:0];       
    UICollectionViewLayoutAttributes* attr = [UICollectionViewLayoutAttributes layoutAttributesForCellWithIndexPath:indexPath];       
    //取出數據       
    ClothesModel* model = self.clothesInfos[i];
    //計算frame
    attr.frame = CGRectMake(itemX, itemY, itemWidth, itemHeight);
    //保存數據       
    [marr addObject:attr];
    }
    //計算footView的frame
    NSIndexPath* footPath = [NSIndexPath indexPathForRow:0 inSection:0];       
    UICollectionViewLayoutAttributes* footAtt = [UICollectionViewLayoutAttributes layoutAttributesForSupplementaryViewOfKind:UICollectionElementKindSectionFooter withIndexPath:footPath];
    footAtt.frame = CGRectMake(footX, footY, footW, footH);
    [marr addObject:footAtt];   
    // 把數據保存到佈局數組   
    self.layoutAttributeMarr = marr;
}
2、計算內容區域
- (CGSize)collectionViewContentSize{   
  CGFloat CVCWidth = [UIScreen mainScreen].bounds.size.width;                   
  UICollectionViewLayoutAttributes* lastAtt = self.layoutAttributeMarr.lastObject;   
  CGFloat CVCHeight = CGRectGetMaxY(lastAtt.frame)+_margin;//根據最大的Y值獲得佈局內容的高度   
  CGSize CVCSize = CGSizeMake(CVCWidth, CVCHeight);   
  return CVCSize;
}
3、返回佈局對象數組
- (NSArray<UICollectionViewLayoutAttributes *> *)layoutAttributesForElementsInRect:(CGRect)rect
{   
    return self.layoutAttributeMarr;
}

數據存儲方式：

1.writeToFile
寫入數據:
//1.1 你須要獲取路徑
  NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
// .XXX 尾椎 只是決定 以哪中方式查看數據, 對存入的數據自己沒有影響   
  NSString *fiflePath = [path stringByAppendingPathComponent:@"data.XXX"];
//1.2 寫數據
  NSArray *dataArray = @[@"亞洲國際舞王尼古拉斯趙四",@"小明",@"老王",@"霜霜"];      
//1.3 存    //atomically 原子性的,數據安全的, 百分之九十九都是YES
  [dataArray writeToFile:fiflePath atomically:YES];
讀取數據:
//1.讀取路徑   
  NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
  NSString *fiflePath = [path stringByAppendingPathComponent:@"data.XXX"];
//2.取出來
  NSArray *dataArray = [NSArray arrayWithContentsOfFile:fiflePath];
2.userDefault(偏好設置)
寫入數據:
//1. 獲取系統的偏好設置對象 
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
//2. 存儲數據
    [defaults setObject:@"小明" forKey:@"name"];   
    [defaults setInteger:100 forKey:@"age"];   
    [defaults setBool:NO forKey:@"isTrue"];   
//3.當即同步:  強制寫入
    [defaults synchronize];
讀取數據:
//1.獲取到偏好設置的路徑   
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
//2.讀取數據
    NSString *name =  [defaults objectForKey:@"name"];
    NSInteger age = [defaults integerForKey:@"age"];
    BOOL isTrue = [defaults boolForKey:@"isTrue"];
3.歸檔
寫入數據:
//1.文件路徑   
    NSString *filePath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"data.plist"];     
//1. 有個對象
    CZPserson *p = [[CZPserson alloc]init];
    p.name = @"小明";   
    p.age = 100;   
    p.sex = YES;     
//2.存儲  歸檔   
    [NSKeyedArchiver archiveRootObject:p toFile:filePath];
讀取數據:
注意點: 若是使用歸檔 *
1. 該對象必須遵照NSCoding 協議 編碼協議
2. 實現 encodeWithCoder方法
3. 實現:initWIthCoder方法
    NSString *filePath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"data.plist"];     
//反歸檔 ,解檔
    CZPserson *p = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath];
實現<NSCoding>協議方法:
- (void)encodeWithCoder:(NSCoder *)aCoder{   
  [aCoder encodeBool:self.sex forKey:@"sex"];   
  [aCoder encodeInteger:self.age forKey:@"age"];
  [aCoder encodeObject:self.name forKey:@"name"];   
}
//反歸檔只是個過程, 告訴系統你讀取的時候,想讓別人讀取哪些屬性
- (instancetype)initWithCoder:(NSCoder *)aDecoder{
    if (self = [super init]) {
        self.name = [aDecoder decodeObjectForKey:@"name"];
        self.age  = [aDecoder decodeIntegerForKey:@"age"];
        self.sex = [aDecoder decodeBoolForKey:@"sex"];
    }   
    return self;
}

隨機色:

- (UIColor *)randomColor{ 
return [UIColor colorWithRed:((float)arc4random_uniform(256) / 255.0) green:((float)arc4random_uniform(256) / 255.0) blue:((float)arc4random_uniform(256) / 255.0) alpha:1.0]; 
}

手勢識別：

UITapGestureRecognizer(點按)
UILongPressGestureRecognizer(長按)
UISwipeGestureRecognizer(輕掃)
UIRotationGestureRecognizer(旋轉)
UIPanGestureRecognizer(拖動)
UIPinchGestureRecognizer(捏合，用於縮放)
//1.建立一個手勢 而且監聽 
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPress:)];     
//最小觸發 按壓的時間   
longPress.minimumPressDuration = 2.0;     
//容許多大範圍內 觸發   
longPress.allowableMovement =  20;   
//2.添加到當前你想 操做的控件上 
[self.myImageVIew addGestureRecognizer:longPress];

時間相關：

獲取當前時間:
1.獲取當天的日期
    NSDate *date = [NSDate date];
    //2.獲取當前日曆
    NSCalendar *lendar = [NSCalendar currentCalendar];
    //3.從日曆中獲取 秒數
    //(NSCalendarUnit)  單位
    NSInteger second = [lendar component:NSCalendarUnitSecond fromDate:date];
2.抓取系統時間
    NSDate* nowDate = [NSDate date];
    NSDateFormatter* formatter = [[NSDateFormatter alloc]init];
    formatter.dateFormat = @"yyyy年MM月dd日HH時mm分ss秒";
    NSString *time = [formatter stringFromDate:nowDate];
判斷當前時間
-(BOOL)isToday{     
NSCalendar *calendar=[NSCalendar currentCalendar];     
NSCalendarUnit unit=NSCalendarUnitYear | NSCalendarUnitMonth |NSCalendarUnitDay;     
NSDateComponents *selfCmps=[calendar components:unit fromDate:self];   
NSDateComponents *nowCmps=[calendar components:unit fromDate:[NSDate date]];         
return selfCmps.year==nowCmps.year    &&selfCmps.month==nowCmps.month    &&selfCmps.day==nowCmps.day; 
}
-(BOOL)isYesterday{   
//生成只有年月日的日期對象   
NSDateFormatter *fmt = [[NSDateFormatter alloc]init];   
fmt.dateFormat=@"yyyy-MM-dd";     
NSString *selfString =[fmt stringFromDate:self];   
NSDate * selfDate=[fmt dateFromString:selfString];     
NSString *nowString=[fmt stringFromDate:[NSDate date]];   
NSDate *nowDate=[fmt dateFromString:nowString];     
//比較差距   
NSCalendar *calendar=[NSCalendar currentCalendar];   
NSCalendarUnit  unit=NSCalendarUnitYear |
NSCalendarUnitMonth | NSCalendarUnitDay;   
NSDateComponents *cmps=[calendar components:unit fromDate:selfDate toDate:nowDate options:0];     
return  cmps.year==0    && cmps.month==0    && cmps.day==1 ; 
}
-(BOOL)isTomorrow{   
//生成只有年月日的日期對象   
NSDateFormatter *fmr=[[NSDateFormatter alloc]init];    fmr.dateFormat=@"yyyy-MM-dd";     
NSString *selfString=[fmr stringFromDate:self];   
NSDate  * selfDate=[fmr  dateFromString:selfString];     
NSString *nowString=[fmr stringFromDate:[NSDate date]];   
NSDate  *nowDate=[fmr dateFromString:nowString];     
NSCalendar *calendar =[NSCalendar  currentCalendar];     
NSCalendarUnit unit=NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay;   
NSDateComponents *cmps=[calendar  components:unit fromDate:selfDate toDate:nowDate options:0];     
return cmps.year==0    && cmps.month==0
    && cmps.day==-1; 
}
-(BOOL)isThisYeas{   
NSCalendar  *calendar=[NSCalendar currentCalendar];   
NSInteger  selfYear=[calendar component:NSCalendarUnitYear fromDate:self];   
NSInteger nowYear=[calendar component:NSCalendarUnitYear fromDate:[NSDate date]]; 
    return selfYear==nowYear;
}

動畫：

1.基礎動畫:
//基礎動畫(縮放)
    CABasicAnimation* basic1 = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
    basic1.toValue = @(0.1);
//基礎動畫(旋轉)
    CABasicAnimation* basic2 = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
    basic2.toValue = @(M_PI*2);
2.關鍵幀動畫:
  //建立路徑
    UIBezierPath* path = [UIBezierPath bezierPathWithArcCenter:self.view.center radius:150 startAngle:0 endAngle:M_PI*2 clockwise:YES];
    CAKeyframeAnimation* key = [CAKeyframeAnimation animationWithKeyPath:@"position"];
    key.path = path.CGPath;
3.轉場動畫:
     //3.添加轉場動畫
    CATransition *sition = [CATransition animation];
    //設置屬性
    //樣式
    sition.type = kCATransitionMoveIn;
    //方向
    sition.subtype = kCATransitionFromBottom;
   //添加動畫
    [self.myImageView.layer addAnimation:sition forKey:nil];
4.組動畫:
//建立路徑
    UIBezierPath* path = [UIBezierPath bezierPathWithArcCenter:self.view.center radius:150 startAngle:0 endAngle:M_PI*2 clockwise:YES];
//建立組動畫
    CAAnimationGroup* group = [CAAnimationGroup animation];
    //建立動畫1,關鍵幀動畫
    CAKeyframeAnimation* key = [CAKeyframeAnimation animationWithKeyPath:@"position"];
    key.path = path.CGPath;
    //建立動畫2,基礎動畫(縮放)
    CABasicAnimation* basic1 = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
    basic1.toValue = @(0.1);
    //建立動畫3,基礎動畫(旋轉)
    CABasicAnimation* basic2 = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
    basic2.toValue = @(M_PI*2);
    //設置組動畫
    group.animations = @[key,basic1,basic2];
    group.duration = 2.0;
    group.repeatCount = 10;
  [self.myLayer addAnimation:group forKey:nil];

NavigationController相關：

設置導航欄外觀
    NSDictionary *dict = @{                         
NSFontAttributeName:[UIFont systemFontOfSize:16],
                    NSForegroundColorAttributeName:[UIColor whiteColor]                         
                      }; 
    [self.navigationBar setTitleTextAttributes:dict];     
// 修改導航欄上的item的外觀
    [self.navigationBar setTintColor:[UIColor whiteColor]];
跳轉隱藏tabBar
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated{     
// 1.隱藏tabbar   
  viewController.hidesBottomBarWhenPushed = YES;     
// 2.調用父類方法執行跳轉   
  [super pushViewController:viewController animated:YES];
}
設置狀態欄
- (UIStatusBarStyle)preferredStatusBarStyle{
    return UIStatusBarStyleLightContent;
}

加載本地的html:

// 建立一個url 
// NSURL *url = [NSURL URLWithString:@"https://www.baidu.com"]; 
NSURL *url = [[NSBundle mainBundle] URLForResource:self.help.html withExtension:nil]; 
// 建立一個請求對象 
NSURLRequest *request = [NSURLRequest requestWithURL:url]; 
// 使用webView加載請求對象
 [webView loadRequest:request]; 
// 開始加載 
- (void)webViewDidStartLoad:(UIWebView *)webView{ NSLog(@"開始加載");} 
// 加載結束時執行Javascript代碼 
- (void)webViewDidFinishLoad:(UIWebView *)webView{ 
// 須要執行的JavaScript代碼 
NSString *jsCode = [NSString stringWithFormat:@"window.location.href = '#%@'",self.help.ID]; 
// webView執行js代碼 
[webView stringByEvaluatingJavaScriptFromString:jsCode]; }

字符串轉對象:

// 獲取accessoryType 
NSString *accessoryType = item[@"accessoryType"];
// 根據字符串建立類 
Class class = NSClassFromString(accessoryType);
 // 根據類實例化對象 
UIView *accessoryView = [[class alloc] init]; 
// 判斷是不是UIImageView 
if ([accessoryView isKindOfClass:[UIImageView class]]) { 
// 強轉成UIImageView 
UIImageView *imgView = (UIImageView *)accessoryView; 
// 設置ImgView的圖片 
imgView.image = [UIImage imageNamed:@"arrow_right"]; 
// 自適應大小
 [imgView sizeToFit];
}

撥打電話:

//1.獲取APP 對象
 UIApplication *app = [UIApplication sharedApplication]; 
//2.打電話 
NSURL *url = [NSURL URLWithString:@"tel://1234567890"]; 
[app openURL:url]; 
//簡寫: 
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"tel://1234567890"]];

應用程序之間跳轉:

NSURL *URL = [NSURL URLWithString:@"appB://ios.myapp.cn"]; 
[[UIApplication sharedApplication] openURL:URL];

裁剪圖片

//1.裁剪區域 
CGRect rect = CGRectMake(x, y, w, h); 
// 2.調用系統的裁剪方法裁剪圖片
 /* 參數: 1.被裁剪的大圖 CG類型 2.須要裁剪的區域 */ 
CGImageRef imageRef = CGImageCreateWithImageInRect(image.CGImage, rect); // 轉換成UIImage 
UIImage *img = [UIImage imageWithCGImage:imageRef]; 
// 釋放imageRef 
CGImageRelease(imageRef);

傳遞事件,判斷當前點是否在一個區域內

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event{
 // 1.描述一下按鈕上部分的區域 
CGRect rect = CGRectMake(0, 0, self.bounds.size.width, 100); 
// 2.判斷當前點擊的點在不在上部分(若是不在,就直接返回nil) 
if (!CGRectContainsPoint(rect, point)) { return nil; } 
// 3.繼續傳遞事件 
return [super hitTest:point withEvent:event]; }

從網絡獲取圖片

NSURL* url = [NSURL URLWithString:@"http://d.hiphotos.baidu.com/image/h%3D200/sign=c36bc6f3d32a28345ca6310b6bb4c92e/91ef76c6a7efce1b3e241e24a851f3deb58f65d5.jpg"]; 
NSData* data = [NSData dataWithContentsOfURL:url]; 
UIImage* image = [UIImage imageWithData:data];

開啓子線程

第一種方法
NSThread *thread1 = [[NSThread alloc]initWithTarget:self selector:@selector(buyTickets) object:nil];   
//設置名稱   
thread1.name = @"1111";   
//設置優先級   
thread1.threadPriority = 0.3;
[thread1s start];
第二種方法
  [NSThread detachNewThreadSelector:@selector(buyTickets) toTarget:self withObject:nil];
第三種方法
  [self performSelectorInBackground:@selector(buyTickets) withObject:nil];

url中文和特殊字符轉碼

- (NSString *)generateUrl:(NSString *)url{
/** 第一個參數:NULL 第二個參數:C語言的字符串 第三個參數:NULL 第四個參數:要轉義的字符串,不要亂轉 第五個參數:編碼 */ 
NSString *encodedString = (__bridge_transfer NSString *)CFURLCreateStringByAddingPercentEscapes( NULL,(__bridge CFStringRef)url,NULL,CFSTR("+"),CFStringConvertNSStringEncodingToEncoding(NSUTF8StringEncoding)); return encodedString; 
}

數據加密

base64加密
加密
- (NSString *)base64Encode:(NSString *)originalString{         
//1.將originalString轉成二進制   
NSData *data =  [originalString dataUsingEncoding:NSUTF8StringEncoding];     
//2.須要將二進制轉成Base64加密以後的字符串   
return [data base64EncodedStringWithOptions:0];
}
解密
- (NSString *)base64Decode:(NSString *)base64String{     
//1.Base64加密以後的字符串轉成 NSData   
NSData *data = [[NSData alloc] initWithBase64EncodedString:base64String options:0];     
//2.將二進制轉在字符串   
NSString *originalString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];     
return originalString;
}
鑰匙串
//設置鑰匙串
    self.bundleId = [NSBundle mainBundle].bundleIdentifier;
    NSString* value = [SSKeychain passwordForService:self.bundleId account:@"password"];
//保存密碼到鑰匙串
    [SSKeychain setPassword:password forService:self.bundleId account:@"password"];
MD5/SHA
//散列函數
- (NSString *)md5String {
    const char *str = self.UTF8String;
    uint8_t buffer[CC_MD5_DIGEST_LENGTH];
    CC_MD5(str, (CC_LONG)strlen(str), buffer);
    return [self stringFromBytes:buffer length:CC_MD5_DIGEST_LENGTH];
}
- (NSString *)sha1String {
    const char *str = self.UTF8String;
    uint8_t buffer[CC_SHA1_DIGEST_LENGTH];
    CC_SHA1(str, (CC_LONG)strlen(str), buffer);
    return [self stringFromBytes:buffer length:CC_SHA1_DIGEST_LENGTH];
}
- (NSString *)sha256String {
    const char *str = self.UTF8String;
    uint8_t buffer[CC_SHA256_DIGEST_LENGTH];
    CC_SHA256(str, (CC_LONG)strlen(str), buffer);
    return [self stringFromBytes:buffer length:CC_SHA256_DIGEST_LENGTH];
}
- (NSString *)sha512String {
    const char *str = self.UTF8String;
    uint8_t buffer[CC_SHA512_DIGEST_LENGTH];
    CC_SHA512(str, (CC_LONG)strlen(str), buffer);
    return [self stringFromBytes:buffer length:CC_SHA512_DIGEST_LENGTH];
}
#pragma mark - HMAC 散列函數
- (NSString *)hmacMD5StringWithKey:(NSString *)key {
    const char *keyData = key.UTF8String;
    const char *strData = self.UTF8String;
    uint8_t buffer[CC_MD5_DIGEST_LENGTH];
    CCHmac(kCCHmacAlgMD5, keyData, strlen(keyData), strData, strlen(strData), buffer);
    return [self stringFromBytes:buffer length:CC_MD5_DIGEST_LENGTH];
}
- (NSString *)hmacSHA1StringWithKey:(NSString *)key {
    const char *keyData = key.UTF8String;
    const char *strData = self.UTF8String;
    uint8_t buffer[CC_SHA1_DIGEST_LENGTH];
    CCHmac(kCCHmacAlgSHA1, keyData, strlen(keyData), strData, strlen(strData), buffer);
    return [self stringFromBytes:buffer length:CC_SHA1_DIGEST_LENGTH];
}
- (NSString *)hmacSHA256StringWithKey:(NSString *)key {
    const char *keyData = key.UTF8String;
    const char *strData = self.UTF8String;
    uint8_t buffer[CC_SHA256_DIGEST_LENGTH];
    CCHmac(kCCHmacAlgSHA256, keyData, strlen(keyData), strData, strlen(strData), buffer);
    return [self stringFromBytes:buffer length:CC_SHA256_DIGEST_LENGTH];
}
- (NSString *)hmacSHA512StringWithKey:(NSString *)key {
    const char *keyData = key.UTF8String;
    const char *strData = self.UTF8String;
    uint8_t buffer[CC_SHA512_DIGEST_LENGTH];
    CCHmac(kCCHmacAlgSHA512, keyData, strlen(keyData), strData, strlen(strData), buffer);
    return [self stringFromBytes:buffer length:CC_SHA512_DIGEST_LENGTH];
}
#pragma mark - 文件散列函數
#define FileHashDefaultChunkSizeForReadingData 4096
- (NSString *)fileMD5Hash {
    NSFileHandle *fp = [NSFileHandle fileHandleForReadingAtPath:self];
    if (fp == nil) {
        return nil;
    }
    CC_MD5_CTX hashCtx;
    CC_MD5_Init(&hashCtx);
    while (YES) {
        @autoreleasepool {
            NSData *data = [fp readDataOfLength:FileHashDefaultChunkSizeForReadingData];
            CC_MD5_Update(&hashCtx, data.bytes, (CC_LONG)data.length);
            if (data.length == 0) {
                break;
            }
        }
    }
    [fp closeFile];

    uint8_t buffer[CC_MD5_DIGEST_LENGTH];
    CC_MD5_Final(buffer, &hashCtx);
    return [self stringFromBytes:buffer length:CC_MD5_DIGEST_LENGTH];
}
- (NSString *)fileSHA1Hash {
    NSFileHandle *fp = [NSFileHandle fileHandleForReadingAtPath:self];
    if (fp == nil) {
        return nil;
    }
    CC_SHA1_CTX hashCtx;
    CC_SHA1_Init(&hashCtx);
    while (YES) {
        @autoreleasepool {
            NSData *data = [fp readDataOfLength:FileHashDefaultChunkSizeForReadingData];
            CC_SHA1_Update(&hashCtx, data.bytes, (CC_LONG)data.length);
            if (data.length == 0) {
                break;
            }
        }
    }
    [fp closeFile];
    uint8_t buffer[CC_SHA1_DIGEST_LENGTH];
    CC_SHA1_Final(buffer, &hashCtx);
    return [self stringFromBytes:buffer length:CC_SHA1_DIGEST_LENGTH];
}
- (NSString *)fileSHA256Hash {
    NSFileHandle *fp = [NSFileHandle fileHandleForReadingAtPath:self];
    if (fp == nil) {
        return nil;
    }
    CC_SHA256_CTX hashCtx;
    CC_SHA256_Init(&hashCtx);
    while (YES) {
        @autoreleasepool {
            NSData *data = [fp readDataOfLength:FileHashDefaultChunkSizeForReadingData];
            CC_SHA256_Update(&hashCtx, data.bytes, (CC_LONG)data.length);
            if (data.length == 0) {
                break;
            }
        }
    }
    [fp closeFile];
    uint8_t buffer[CC_SHA256_DIGEST_LENGTH];
    CC_SHA256_Final(buffer, &hashCtx);
    return [self stringFromBytes:buffer length:CC_SHA256_DIGEST_LENGTH];
}
- (NSString *)fileSHA512Hash {
    NSFileHandle *fp = [NSFileHandle fileHandleForReadingAtPath:self];
    if (fp == nil) {
        return nil;
    }
    CC_SHA512_CTX hashCtx;
    CC_SHA512_Init(&hashCtx);
    while (YES) {
        @autoreleasepool {
            NSData *data = [fp readDataOfLength:FileHashDefaultChunkSizeForReadingData];
            CC_SHA512_Update(&hashCtx, data.bytes, (CC_LONG)data.length);
            if (data.length == 0) {
                break;
            }
        }
    }
    [fp closeFile];
    uint8_t buffer[CC_SHA512_DIGEST_LENGTH];
    CC_SHA512_Final(buffer, &hashCtx);
    return [self stringFromBytes:buffer length:CC_SHA512_DIGEST_LENGTH];
}
#pragma mark - 助手方法
/**
*  返回二進制 Bytes 流的字符串表示形式
*
*  @param bytes  二進制 Bytes 數組
*  @param length 數組長度
*
*  @return 字符串表示形式
*/
- (NSString *)stringFromBytes:(uint8_t *)bytes length:(int)length {
    NSMutableString *strM = [NSMutableString string];
    for (int i = 0; i < length; i++) {
        [strM appendFormat:@"%02x", bytes[i]];
    }
    return [strM copy];
}

解壓縮文件

//下載完畢解壓到當前文件夾
 [SSZipArchive unzipFileAtPath:location.path toDestination:self.destinationPath uniqueId:nil];

數組排序

[marr sortUsingComparator:^NSComparisonResult(NewsModel* model1, NewsModel* model2) { return [model1.num compare: model2.num]; }];

數組倒序

NSArray* arr = [[ordersMarr reverseObjectEnumerator] allObjects];

NSArray 快速求總和、最大值、最小值、平均值

- (void)caculateArray:(NSArray *)array{ 
CGFloat sum = [[array valueForKeyPath:@"@sum.floatValue"] floatValue]; 
CGFloat avg = [[array valueForKeyPath:@"@avg.floatValue"] floatValue]; 
CGFloat max =[[array valueForKeyPath:@"@max.floatValue"] floatValue];
CGFloat min =[[array valueForKeyPath:@"@min.floatValue"] floatValue]; 
NSLog(@"%fn%fn%fn%f",sum,avg,max,min); 
return [NSString stringWithFormat:@"%f",sum];
 }

字符串排序分組

將字符串數組按照元素首字母順序進行排序分組
+ (NSDictionary *)dictionaryOrderByCharacterWithOriginalArray:(NSArray *)array{   
    if (array.count == 0)
    {       
        return nil;   
    }   
    for (id obj in array) {       
          if (![obj isKindOfClass:[NSString class]])
          {           
            return nil;       
          }   
    }   
  UILocalizedIndexedCollation *indexedCollation = [UILocalizedInd  exedCollation currentCollation];   
  NSMutableArray *objects = [NSMutableArray arrayWithCapacity:indexedCollation.sectionTitles.count];   
//建立27個分組數組   
  for (int i = 0; i < indexedCollation.sectionTitles.count; i++) {       
      NSMutableArray *obj = [NSMutableArray array];       
      [objects addObject:obj];   
  }   
  NSMutableArray *keys = [NSMutableArray arrayWithCapacity:objects.count];   
//按字母順序進行分組   
  NSInteger lastIndex = -1;   
  for (int i = 0; i < array.count; i++) {       
    NSInteger index = [indexedCollation sectionForObject:array[i] collationStringSelector:@selector(uppercaseString)];       
    [[objects objectAtIndex:index] addObject:array[i]];       
    lastIndex = index;   
  }   
//去掉空數組   
  for (int i = 0; i < objects.count; i++) {       
    NSMutableArray *obj = objects[i];       
    if (obj.count == 0) {           
        [objects removeObject:obj];       
    }   
  }   
//獲取索引字母   
  for (NSMutableArray *obj in objects) {       
      NSString *str = obj[0];       
      NSString *key = [self firstCharacterWithString:str];       
      [keys addObject:key];   
  }   
  NSMutableDictionary *dic = [NSMutableDictionary dictionary];   
  [dic setObject:objects forKey:keys];   
  return dic;
}

計算磁盤大小

1.磁盤總空間大小
+ (CGFloat)diskOfAllSizeMBytes{   
CGFloat size = 0.0;   
NSError *error;   
NSDictionary *dic = [[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:&error];   
  if (error) {
    #ifdef DEBUG       
    NSLog(@"error: %@", error.localizedDescription);
    #endif   
  }else{       
    NSNumber *number = [dic objectForKey:NSFileSystemSize];       
    size = [number floatValue]/1024/1024;   
  }   
return size;
}
2.磁盤可用空間大小
+ (CGFloat)diskOfFreeSizeMBytes{   
CGFloat size = 0.0;   
NSError *error;   
NSDictionary *dic = [[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:&error];   
  if (error) {
    #ifdef DEBUG       
    NSLog(@"error: %@", error.localizedDescription);
    #endif   
  }else{       
    NSNumber *number = [dic objectForKey:NSFileSystemFreeSize];       
    size = [number floatValue]/1024/1024;   
  }   
return size;
}

相冊選擇多文件(ZLPhotos)

//進入相冊   
ZLPhotoPickerViewController* imgPickerController = [[ZLPhotoPickerViewController alloc]init];   
imgPickerController.status = PickerViewShowStatusSavePhotos;   
imgPickerController.maxCount = 3;    //設置最大可選擇數
[self presentViewController:imgPickerController animated:YES completion:nil];
//block傳值
__weak typeof(self) weakSelf = self;
imgPickerController.callBack = ^(NSArray *assets){             
    for (ZLPhotoAssets *photoAsset in assets) {                     
    UIImage *image = photoAsset.originImage;                     
    NSData *imageData  =UIImagePNGRepresentation(image);                     
//隨機生成的文件名稱           
    NSString *fileName = [NSString stringWithFormat:@"%d.png",arc4random_uniform(100)];                      
//將每次獲取到的圖片,加入到字典中
    [weakSelf.fileDict setObject:imageData forKey:fileName];
    }
};

圖片處理

對圖片進行濾鏡處理
// 懷舊 --> CIPhotoEffectInstant                       
單色 --> CIPhotoEffectMono
// 黑白 --> CIPhotoEffectNoir                           
褪色 --> CIPhotoEffectFade
// 色調 --> CIPhotoEffectTonal                         
沖印 --> CIPhotoEffectProcess
// 歲月 --> CIPhotoEffectTransfer                       
鉻黃 --> CIPhotoEffectChrome
// CILinearToSRGBToneCurve, CISRGBToneCurveToLinear, CIGaussianBlur, CIBoxBlur, CIDiscBlur, CISepiaTone, CIDepthOfField
+ (UIImage *)filterWithOriginalImage:(UIImage *)image filterName:(NSString *)name{   
CIContext *context = [CIContext contextWithOptions:nil];   
CIImage *inputImage = [[CIImage alloc] initWithImage:image];   
CIFilter *filter = [CIFilter filterWithName:name];   
[filter setValue:inputImage forKey:kCIInputImageKey];   
CIImage *result = [filter valueForKey:kCIOutputImageKey];   
CGImageRef cgImage = [context createCGImage:result fromRect:[result extent]];   
UIImage *resultImage = [UIImage imageWithCGImage:cgImage];   
CGImageRelease(cgImage);   
return resultImage;
}
對圖片進行模糊處理
// CIGaussianBlur ---> 高斯模糊
// CIBoxBlur      ---> 均值模糊(Available in iOS 9.0 and later)
// CIDiscBlur    ---> 環形卷積模糊(Available in iOS 9.0 and later)
// CIMedianFilter ---> 中值模糊, 用於消除圖像噪點, 無需設置radius(Available in iOS 9.0 and later)
// CIMotionBlur  ---> 運動模糊, 用於模擬相機移動拍攝時的掃尾效果(Available in iOS 9.0 and later)
+ (UIImage *)blurWithOriginalImage:(UIImage *)image blurName:(NSString *)name radius:(NSInteger)radius{   
CIContext *context = [CIContext contextWithOptions:nil];   
CIImage *inputImage = [[CIImage alloc] initWithImage:image];   
CIFilter *filter;   
  if (name.length != 0) {       
    filter = [CIFilter filterWithName:name];       
    [filter setValue:inputImage forKey:kCIInputImageKey];       
    if (![name isEqualToString:@"CIMedianFilter"]) {           
      [filter setValue:@(radius) forKey:@"inputRadius"];     
    }       
  CIImage *result = [filter valueForKey:kCIOutputImageKey];       
  CGImageRef cgImage = [context createCGImage:result fromRect:  [result extent]];       
  UIImage *resultImage = [UIImage imageWithCGImage:cgImage];   
  CGImageRelease(cgImage);       
  return resultImage;   
  } else {       
    return nil;   
  }
}
毛玻璃效果
//Avilable in iOS 8.0 and later
+ (UIVisualEffectView *)effectViewWithFrame:(CGRect)frame{   
UIBlurEffect *effect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];   
UIVisualEffectView *effectView = [[UIVisualEffectView alloc] initWithEffect:effect];   
effectView.frame = frame;   
return effectView;
}
給image設置尺寸(縮放圖片)
- (UIImage *)imageByScalingToSize:(CGSize)targetSize{   
UIImage *sourceImage = self;   
UIImage *newImage = nil;   
CGSize imageSize = sourceImage.size;   
CGFloat width = imageSize.width;   
CGFloat height = imageSize.height;   
CGFloat targetWidth = targetSize.width;   
CGFloat targetHeight = targetSize.height;   
CGFloat scaleFactor = 0.0;   
CGFloat scaledWidth = targetWidth;   
CGFloat scaledHeight = targetHeight;   
CGPoint thumbnailPoint = CGPointMake(0.0,0.0);   
if (CGSizeEqualToSize(imageSize, targetSize) ==NO) {        CGFloat widthFactor = targetWidth / width;       
CGFloat heightFactor = targetHeight / height;       
if (widthFactor < heightFactor)           
scaleFactor = widthFactor;       
else           
scaleFactor = heightFactor;       
scaledWidth  = width * scaleFactor;       
scaledHeight = height * scaleFactor;             
if (widthFactor < heightFactor) {                     
thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5;     
} else if (widthFactor > heightFactor) {         
thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5;     
}   
}     
UIGraphicsBeginImageContext(targetSize);   
CGRect thumbnailRect = CGRectZero;   
thumbnailRect.origin = thumbnailPoint;   
thumbnailRect.size.width  = scaledWidth;   
thumbnailRect.size.height = scaledHeight;   
[sourceImage drawInRect:thumbnailRect];   
newImage =UIGraphicsGetImageFromCurrentImageContext();   
UIGraphicsEndImageContext();   
if(newImage == nil)       
NSLog(@"could not scale image");   
return newImage ;
}

設置Label的行間距

+ (void)setLineSpaceWithString:(UILabel *)label{     
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:label.text];   
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];   
[paragraphStyle setLineSpacing:3];     
//調整行間距   
[attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [label.text length])];   
label.attributedText = attributedString;
}
設置Label裏的字符有不一樣的顏色
//可根據本身的需求進行增刪改
- (void)stringColorSet {   
NSString*string = @"如何使得Label裏的字符有不一樣的顏色？";   
NSRange range = [string rangeOfString: @"Label"];   
NSMutableAttributedString*attribute = [[NSMutableAttributedString alloc] initWithString: string];   
[attribute addAttributes: @{NSForegroundColorAttributeName: [UIColor redColor]}range: range];   
[attribute addAttributes: @{NSForegroundColorAttributeName: [UIColor greenColor]}range: NSMakeRange(0, range.location)];   
[attribute addAttributes: @{NSForegroundColorAttributeName: [UIColor cyanColor]}range: NSMakeRange(range.location+ range.length, 5)];   
UILabel *label = [[UILabel alloc] initWithFrame: CGRectMake(0.0f, 100.0f, 320.0f, 100.0f)];   
[label setText: string];   
[label setAttributedText: attribute];}
設置label顯示多行文字
let lab = UILabel()       
let title = "立刻登錄\n\n開啓個人奇妙之旅~"             
//富文本單獨設置後面的名稱       
let attr = NSMutableAttributedString(string: title)       
//獲取名字範圍       
let range = (title as NSString).rangeOfString("開啓個人奇妙之旅~")       
//單獨設置制定範圍的字符串       
attr.addAttributes([NSForegroundColorAttributeName : UIColor.lightGrayColor(),NSFontAttributeName : UIFont.systemFontOfSize(12)], range: range)             
//賦值       
lab.attributedText = attire             
//設置換行       
lab.numberOfLines = 0       
//設置文字大小     
lab.font = UIFont.systemFontOfSize(14)       
//文字顏色       
lab.textColor = UIColor.grayColor()       
//文字居中       
lab.textAlignment = .Center

信息驗證

判斷手機號碼格式是否正確，利用正則表達式驗證
+ (BOOL)isMobileNumber:(NSString *)mobileNum{
    if (mobileNum.length != 11) {
    return NO;
    }
/** * 手機號碼:
* 13[0-9], 14[5,7], 15[0, 1, 2, 3, 5, 6, 7, 8, 9], 17[6, 7, 8], 18[0-9], 170[0-9]
* 移動號段:
134,135,136,137,138,139,150,151,152,157,158,159,182,183,184,187,188,147,178,1705
* 聯通號段: 130,131,132,155,156,185,186,145,176,1709
* 電信號段: 133,153,180,181,189,177,1700 *
/ NSString *MOBILE = @"^1(3[0-9]|4[57]|5[0-35-9]|8[0-9]|70)\d{8}$";
/**
* 中國移動：China Mobile * 134,135,136,137,138,139,150,151,152,157,158,159,182,183,184,187,188,147,178,1705 */
NSString *CM = @"(^1(3[4-9]|4[7]|5[0-27-9]|7[8]|8[2-478])\d{8}$)|(^1705\d{7}$)";
/** * 中國聯通：China Unicom * 130,131,132,155,156,185,186,145,176,1709 */
NSString *CU = @"(^1(3[0-2]|4[5]|5[56]|7[6]|8[56])\d{8}$)|(^1709\d{7}$)";
/**
* 中國電信：China Telecom * 133,153,180,181,189,177,1700 */ NSString *CT = @"(^1(33|53|77|8[019])\d{8}$)|(^1700\d{7}$)";
NSPredicate *regextestmobile = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", MOBILE];
NSPredicate *regextestcm = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM];
NSPredicate *regextestcu = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU];
NSPredicate *regextestct = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT];
if (([regextestmobile evaluateWithObject:mobileNum] == YES) || ([regextestcm evaluateWithObject:mobileNum] == YES) || ([regextestct evaluateWithObject:mobileNum] == YES) || ([regextestcu evaluateWithObject:mobileNum] == YES))
    {
      return YES;
    } else {
      return NO;
    }
}
2. 判斷郵箱格式是否正確，利用正則表達式驗證
+ (BOOL)isAvailableEmail:(NSString *)email{ 
NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}"; 
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex]; 
return [emailTest evaluateWithObject:email];
}
3. 判斷字符串中是否含有空格
+ (BOOL)isHaveSpaceInString:(NSString *)string{
NSRange _range = [string rangeOfString:@" "];
if (_range.location != NSNotFound) {
    return YES;
  }else {
    return NO;
  }
}
4. 判斷字符串中是否含有中文
+ (BOOL)isHaveChineseInString:(NSString *)string{
  for(NSInteger i = 0; i < [string length]; i++){
  int a = [string characterAtIndex:i];
    if (a > 0x4e00 && a < 0x9fff) {
      return YES;
    }
  }
  return NO;
}
判斷身份證格式
+ (BOOL)checkIdentityCardNo:(NSString*)value {
    value = [value stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
    NSInteger length =0;
    if (!value) {
        return NO;
    }else {
        length = value.length;
        if (length !=15 && length !=18) {
            return NO;
        }
    }
    // 省份代碼
    NSArray *areasArray =@[@"11",@"12", @"13",@"14", @"15",@"21", @"22",@"23", @"31",@"32", @"33",@"34", @"35",@"36", @"37",@"41", @"42",@"43", @"44",@"45", @"46",@"50", @"51",@"52", @"53",@"54", @"61",@"62", @"63",@"64", @"65",@"71", @"81",@"82", @"91"];
    NSString *valueStart2 = [value substringToIndex:2];
    BOOL areaFlag =NO;
    for (NSString *areaCode in areasArray) {
        if ([areaCode isEqualToString:valueStart2]) {
            areaFlag =YES;
            break;
        }
    }
    if (!areaFlag) {
        return false;
    }
    NSRegularExpression *regularExpression;
    NSUInteger numberofMatch;
    NSInteger year =0;
    switch (length) {
        case 15:
            year = [[value substringWithRange:NSMakeRange(6,2)] integerValue] +1900;
            if (year %4 ==0 || (year 0 ==0 && year %4 ==0)) {
                regularExpression = [[NSRegularExpression alloc]initWithPattern:@"^[1-9][0-9]{5}[0-9]{2}((01|03|05|07|08|10|12)(0[1-9]|[1-2][0-9]|3[0-1])|(04|06|09|11)(0[1-9]|[1-2][0-9]|30)|02(0[1-9]|[1-2][0-9]))[0-9]{3}$" options:NSRegularExpressionCaseInsensitive error:nil];//測試出生日期的合法性
            }else {
                regularExpression = [[NSRegularExpression alloc]initWithPattern:@"^[1-9][0-9]{5}[0-9]{2}((01|03|05|07|08|10|12)(0[1-9]|[1-2][0-9]|3[0-1])|(04|06|09|11)(0[1-9]|[1-2][0-9]|30)|02(0[1-9]|1[0-9]|2[0-8]))[0-9]{3}$" options:NSRegularExpressionCaseInsensitive error:nil];//測試出生日期的合法性
            }
            numberofMatch = [regularExpression numberOfMatchesInString:value options:NSMatchingReportProgress range:NSMakeRange(0, value.length)];
            if(numberofMatch >0) {
                return YES;
            }else {
                return NO;
            }
        case 18:
            year = [value substringWithRange:NSMakeRange(6,4)].intValue;
            if (year %4 ==0 || (year 0 ==0 && year %4 ==0)) {
                regularExpression = [[NSRegularExpression alloc]initWithPattern:@"^[1-9][0-9]{5}19[0-9]{2}((01|03|05|07|08|10|12)(0[1-9]|[1-2][0-9]|3[0-1])|(04|06|09|11)(0[1-9]|[1-2][0-9]|30)|02(0[1-9]|[1-2][0-9]))[0-9]{3}[0-9Xx]$" options:NSRegularExpressionCaseInsensitive error:nil];//測試出生日期的合法性
            }else {
                regularExpression = [[NSRegularExpression alloc]initWithPattern:@"^[1-9][0-9]{5}19[0-9]{2}((01|03|05|07|08|10|12)(0[1-9]|[1-2][0-9]|3[0-1])|(04|06|09|11)(0[1-9]|[1-2][0-9]|30)|02(0[1-9]|1[0-9]|2[0-8]))[0-9]{3}[0-9Xx]$" options:NSRegularExpressionCaseInsensitive error:nil];//測試出生日期的合法性
            }
            numberofMatch = [regularExpression numberOfMatchesInString:value options:NSMatchingReportProgress range:NSMakeRange(0, value.length)];
            if(numberofMatch >0) {
                int S = ([value substringWithRange:NSMakeRange(0,1)].intValue + [value substringWithRange:NSMakeRange(10,1)].intValue) *7 + ([value substringWithRange:NSMakeRange(1,1)].intValue + [value substringWithRange:NSMakeRange(11,1)].intValue) *9 + ([value substringWithRange:NSMakeRange(2,1)].intValue + [value substringWithRange:NSMakeRange(12,1)].intValue) *10 + ([value substringWithRange:NSMakeRange(3,1)].intValue + [value substringWithRange:NSMakeRange(13,1)].intValue) *5 + ([value substringWithRange:NSMakeRange(4,1)].intValue + [value substringWithRange:NSMakeRange(14,1)].intValue) *8 + ([value substringWithRange:NSMakeRange(5,1)].intValue + [value substringWithRange:NSMakeRange(15,1)].intValue) *4 + ([value substringWithRange:NSMakeRange(6,1)].intValue + [value substringWithRange:NSMakeRange(16,1)].intValue) *2 + [value substringWithRange:NSMakeRange(7,1)].intValue *1 + [value substringWithRange:NSMakeRange(8,1)].intValue *6 + [value substringWithRange:NSMakeRange(9,1)].intValue *3;
                int Y = S ;
                NSString *M =@"F";
                NSString *JYM =@"10X98765432";
                M = [JYM substringWithRange:NSMakeRange(Y,1)];// 判斷校驗位
                if ([M isEqualToString:[value substringWithRange:NSMakeRange(17,1)]]) {
                    return YES;// 檢測ID的校驗位
                }else {
                    return NO;
                }
            }else {
                return NO;
            }
        default:
            return false;
    }
}

經常使用函數:

rand() ----隨機數
abs() / labs() ----整數絕對值
fabs() / fabsf() / fabsl() ----浮點數絕對值
floor() / floorf() / floorl() ----向下取整
ceil() / ceilf() / ceill() ----向上取整
round() / roundf() / roundl() ----四捨五入
sqrt() / sqrtf() / sqrtl() ----求平方根
fmax() / fmaxf() / fmaxl() ----求最大值
fmin() / fminf() / fminl() ----求最小值
hypot() / hypotf() / hypotl() ----求直角三角形斜邊的長度
fmod() / fmodf() / fmodl() ----求兩數整除後的餘數
modf() / modff() / modfl() ----浮點數分解爲整數和小數
frexp() / frexpf() / frexpl() ----浮點數分解尾數和二爲底的指數
sin() / sinf() / sinl() ----求正弦值
sinh() / sinhf() / sinhl() ----求雙曲正弦值
cos() / cosf() / cosl() ----求餘弦值
cosh() / coshf() / coshl() ----求雙曲餘弦值
tan() / tanf() / tanl() ----求正切值
tanh() / tanhf() / tanhl() ----求雙曲正切值
asin() / asinf() / asinl() ----求反正弦值
asinh() / asinhf() / asinhl() ----求反雙曲正弦值
acos() / acosf() / acosl() ----求反餘弦值
acosh() / acoshf() / acoshl() ----求反雙曲餘弦值
atan() / atanf() / atanl() ----求反正切值
atan2() / atan2f() / atan2l() ----求座標值的反正切值
atanh() / atanhf() / atanhl() ----求反雙曲正切值

判斷手勢方向:

CGPoint translation = [scrollView.panGestureRecognizer translationInView:scrollView.superview]; 
if (translation.y>0) { 
// NSLog(@"----------下-----------"); 
}else if(translation.y<0){ 
// NSLog(@"----------上-----------"); 
}

獲取路徑下文件大小

- (unsigned long long)fileSizes{ 
// 得到文件管理者 
NSFileManager *mgr = [NSFileManager defaultManager]; 
// 是否爲文件夾 
BOOL isDirectory = NO; 
// 先判斷路徑的存在性 
BOOL exists = [mgr fileExistsAtPath:self isDirectory:&isDirectory];
 // 路徑不存在 
if (!exists) return 0; 
// 若是是文件夾 
if (isDirectory) { 
// 文件總大小 
unsigned long long fileSize = 0; 
// 遍歷全部文件 
NSDirectoryEnumerator *enumerator = [mgr enumeratorAtPath:self]; for (NSString *subpath in enumerator) { 
// 完整的子路徑 
NSString *fullSubpath = [self stringByAppendingPathComponent:subpath]; 
fileSize += [mgr attributesOfItemAtPath:fullSubpath error:nil].fileSize; } 
return fileSize; 
} 
// 若是是文件 
return [mgr attributesOfItemAtPath:self error:nil].fileSize; 
}

獲取設備型號

+ (NSString *)platform{ 
size_t size; 
sysctlbyname("hw.machine", NULL, &size, NULL, 0); 
char *machine = malloc(size); sysctlbyname("hw.machine", machine, &size, NULL, 0); 
NSString *platform = [NSString stringWithCString:machine encoding:NSUTF8StringEncoding]; 
free(machine); 
if ([platform isEqualToString:@"iPhone1,1"]) return @"iPhone 1G"; 
if ([platform isEqualToString:@"iPhone1,2"]) return @"iPhone 3G"; 
if ([platform isEqualToString:@"iPhone2,1"]) return @"iPhone 3GS"; 
if ([platform isEqualToString:@"iPhone3,1"]) return @"iPhone 4 (GSM)"; 
if ([platform isEqualToString:@"iPhone3,3"]) return @"iPhone 4 (CDMA)"; 
if ([platform isEqualToString:@"iPhone4,1"]) return @"iPhone 4S"; 
if ([platform isEqualToString:@"iPhone5,1"]) return @"iPhone 5 (GSM)"; 
if ([platform isEqualToString:@"iPhone5,2"]) return @"iPhone 5 (GSM+CDMA)"; 
if ([platform isEqualToString:@"iPhone5,3"]) return @"iPhone 5c (GSM)"; 
if ([platform isEqualToString:@"iPhone5,4"]) return @"iPhone 5c (GSM+CDMA)"; 
if ([platform isEqualToString:@"iPhone6,1"]) return @"iPhone 5s (GSM)"; 
if ([platform isEqualToString:@"iPhone6,2"]) return @"iPhone 5s (GSM+CDMA)"; 
if ([platform isEqualToString:@"iPhone7,1"]) return @"iPhone 6Plus GSM"; 
if ([platform isEqualToString:@"iPhone7,2"]) return @"iPhone 6 GSM+CDMA"; 
if ([platform isEqualToString:@"iPhone8,1"]) return @"iPhone 6s GSM"; 
if ([platform isEqualToString:@"iPhone8,2"]) return @"iPhone 6s Plus Global"; 
if ([platform isEqualToString:@"iPhone8,4"]) return @"iPhone SE"; 
if ([platform isEqualToString:@"iPod1,1"]) return @"iPod Touch 1G"; 
if ([platform isEqualToString:@"iPod2,1"]) return @"iPod Touch 2G"; 
if ([platform isEqualToString:@"iPod3,1"]) return @"iPod Touch 3G"; 
if ([platform isEqualToString:@"iPad2,1"]) return @"iPad 2 (WiFi)"; 
if ([platform isEqualToString:@"iPad2,2"]) return @"iPad 2 (GSM)"; 
if ([platform isEqualToString:@"iPad2,3"]) return @"iPad 2 (CDMA)"; 
if ([platform isEqualToString:@"iPad2,4"]) return @"iPad 2 (WiFi)"; 
if ([platform isEqualToString:@"iPad2,5"]) return @"iPad Mini (WiFi)"; 
if ([platform isEqualToString:@"iPad2,6"]) return @"iPad Mini (GSM)"; 
if ([platform isEqualToString:@"iPad2,7"]) return @"iPad Mini (GSM+CDMA)"; 
if ([platform isEqualToString:@"iPad3,1"]) return @"iPad 3 (WiFi)"; 
if ([platform isEqualToString:@"iPad3,2"]) return @"iPad 3 (GSM+CDMA)"; 
if ([platform isEqualToString:@"iPad3,3"]) return @"iPad 3 (GSM)"; 
if ([platform isEqualToString:@"iPad3,4"]) return @"iPad 4 (WiFi)"; 
if ([platform isEqualToString:@"iPad3,5"]) return @"iPad 4 (GSM)"; 
if ([platform isEqualToString:@"iPad3,6"]) return @"iPad 4 (GSM+CDMA)"; 
if ([platform isEqualToString:@"iPad4,1"]) return @"iPad Air (WiFi)"; 
if ([platform isEqualToString:@"iPad4,2"]) return @"iPad Air (GSM)"; 
if ([platform isEqualToString:@"iPad4,4"]) return @"iPad Mini Retina (WiFi)"; 
if ([platform isEqualToString:@"iPad4,5"]) return @"iPad Mini Retina (GSM)"; 
if ([platform isEqualToString:@"i386"]) return @"Simulator"; 
if ([platform isEqualToString:@"x86_64"]) return @"Simulator"; 
return platform; }

緩存處理

緩存路徑
#define CacheFilePath [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject]
清空緩存
+(BOOL)CleanCacheFilePath{   
//拿到path路徑的下一級目錄的子文件夾   
NSArray *subPathArr = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:CacheFilePath error:nil];     
NSString *filePath = nil;     
NSError *error = nil;     
for (NSString *subPath in subPathArr)    {       
filePath = [CacheFilePath stringByAppendingPathComponent:subPath];             
//刪除子文件夾        [[NSFileManager defaultManager] removeItemAtPath:filePath error:&error];     
if (error) {         
  NSLog(@"%@",error);         
  continue;     
}         
}   
return YES; 
}
緩存計算
//轉換B/KB/MB/GB
+(NSString *)SetCacheSize:(unsigned long long)fileSize{   
// 單位   
double unit = 1000.0;   
// 標籤文字   
NSString *fileSizeText = nil;   
if (fileSize >= pow(unit, 3)) {
// fileSize >= 1GB       
fileSizeText = [NSString stringWithFormat:@"%.2fGB", fileSize / pow(unit, 3)];   
} else if (fileSize >= pow(unit, 2)) {
// fileSize >= 1MB       
fileSizeText = [NSString stringWithFormat:@"%.2fMB", fileSize / pow(unit, 2)]; 
} else if (fileSize >= unit) {
// fileSize >= 1KB       
fileSizeText = [NSString stringWithFormat:@"%.2fKB", fileSize / unit];   
} else { // fileSize < 1KB       
fileSizeText = [NSString stringWithFormat:@"%zdB", fileSize]; 
}    return fileSizeText;
}

給TabBarController添加滑動切換

//添加滑動手勢 
 UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(tappedRightButton:)];
 [swipeLeft setDirection:UISwipeGestureRecognizerDirectionLeft];
 [self.view addGestureRecognizer:swipeLeft];
 UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(tappedLeftButton:)];
 [swipeRight setDirection:UISwipeGestureRecognizerDirectionRight];
 [self.view addGestureRecognizer:swipeRight]; 

- (void) tappedRightButton:(id)sender{
 NSUInteger selectedIndex = [self.tabBarController selectedIndex]; 
NSArray *aryViewController = self.tabBarController.viewControllers; 
if (selectedIndex < aryViewController.count - 1) {
 [self.tabBarController setSelectedIndex:selectedIndex + 1];
 } 
} 
- (void) tappedLeftButton:(id)sender{
 NSUInteger selectedIndex = [self.tabBarController selectedIndex];
 if (selectedIndex > 0) {
 [self.tabBarController setSelectedIndex:selectedIndex - 1];
 } 
}