iOS 知識-經常使用小技巧大雜燴
1. 打印View全部子視圖
po [[self view]recursiveDescription]
2. layoutSubviews調用的調用時機
* 當視圖第一次顯示的時候會被調用 * 當這個視圖顯示到屏幕上了,點擊按鈕 * 添加子視圖也會調用這個方法 * 當本視圖的大小發生改變的時候是會調用的 * 當子視圖的frame發生改變的時候是會調用的 * 當刪除子視圖的時候是會調用的
3. NSString過濾特殊字符
// 定義一個特殊字符的集合
NSCharacterSet *set = [NSCharacterSet characterSetWithCharactersInString:
@"@／：；（）¥「」＂、[]{}#%-*+=_\\|~＜＞$€^•'@#$%^&*()_+'\""];
// 過濾字符串的特殊字符
NSString *newString = [trimString stringByTrimmingCharactersInSet:set];
4. TransForm屬性
//平移按鈕 CGAffineTransform transForm = self.buttonView.transform; self.buttonView.transform = CGAffineTransformTranslate(transForm, 10, 0); //旋轉按鈕 CGAffineTransform transForm = self.buttonView.transform; self.buttonView.transform = CGAffineTransformRotate(transForm, M_PI_4); //縮放按鈕 self.buttonView.transform = CGAffineTransformScale(transForm, 1.2, 1.2); //初始化復位 self.buttonView.transform = CGAffineTransformIdentity;
5. 去掉分割線多餘15像素
首先在viewDidLoad方法加入如下代碼：
if ([self.tableView respondsToSelector:@selector(setSeparatorInset:)]) {
[self.tableView setSeparatorInset:UIEdgeInsetsZero];
}
if ([self.tableView respondsToSelector:@selector(setLayoutMargins:)]) {
[self.tableView setLayoutMargins:UIEdgeInsetsZero];
}
而後在重寫willDisplayCell方法
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell
forRowAtIndexPath:(NSIndexPath *)indexPath{
if ([cell respondsToSelector:@selector(setSeparatorInset:)]) {
[cell setSeparatorInset:UIEdgeInsetsZero];
}
if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {
[cell setLayoutMargins:UIEdgeInsetsZero];
}
}
6. 計算方法耗時時間間隔
// 獲取時間間隔 #define TICK CFAbsoluteTime start = CFAbsoluteTimeGetCurrent(); #define TOCK NSLog(@"Time: %f", CFAbsoluteTimeGetCurrent() - start)
7. Color顏色宏定義
// 隨機顏色 #define RANDOM_COLOR [UIColor colorWithRed:arc4random_uniform(256) / 255.0 green:arc4random_uniform(256) / 255.0 blue:arc4random_uniform(256) / 255.0 alpha:1] // 顏色(RGB) #define RGBCOLOR(r, g, b) [UIColor colorWithRed:(r)/255.0f green:(g)/255.0f blue:(b)/255.0f alpha:1] // 利用這種方法設置顏色和透明值，可不影響子視圖背景色 #define RGBACOLOR(r, g, b, a) [UIColor colorWithRed:(r)/255.0f green:(g)/255.0f blue:(b)/255.0f alpha:(a)]
8. Alert提示宏定義
#define Alert(_S_, ...) [[[UIAlertView alloc] initWithTitle:@"提示" message:[NSString stringWithFormat:(_S_), ##__VA_ARGS__] delegate:nil cancelButtonTitle:@"肯定" otherButtonTitles:nil] show]
9. 讓iOS應用直接退出
- (void)exitApplication {
AppDelegate *app = [UIApplication sharedApplication].delegate;
UIWindow *window = app.window;
[UIView animateWithDuration:1.0f animations:^{
window.alpha = 0;
} completion:^(BOOL finished) {
exit(0);
}];
}
10. NSArray 快速求總和 最大值 最小值 和 平均值
NSArray *array = [NSArray arrayWithObjects:@"2.0", @"2.3", @"3.0", @"4.0", @"10", nil]; 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(@"%f\n%f\n%f\n%f",sum,avg,max,min);
10. 修改Label中不一樣文字顏色
- (void)touchesEnded:(NSSet<UITouch> *)touches withEvent:(UIEvent *)event
{
[self editStringColor:self.label.text editStr:@"好" color:[UIColor blueColor]];
}
- (void)editStringColor:(NSString *)string editStr:(NSString *)editStr color:(UIColor *)color {
// string爲總體字符串, editStr爲須要修改的字符串
NSRange range = [string rangeOfString:editStr];
NSMutableAttributedString *attribute = [[NSMutableAttributedString alloc] initWithString:string];
// 設置屬性修改字體顏色UIColor與大小UIFont
[attribute addAttributes:@{NSForegroundColorAttributeName:color} range:range];
self.label.attributedText = attribute;
}
11. 播放聲音
#import<AVFoundation> // 1.獲取音效資源的路徑 NSString *path = [[NSBundle mainBundle]pathForResource:@"pour_milk" ofType:@"wav"]; // 2.將路勁轉化爲url NSURL *tempUrl = [NSURL fileURLWithPath:path]; // 3.用轉化成的url建立一個播放器 NSError *error = nil; AVAudioPlayer *play = [[AVAudioPlayer alloc]initWithContentsOfURL:tempUrl error:&error]; self.player = play; // 4.播放 [play play];
12. 檢測是否IPad Pro
- (BOOL)isIpadPro
{
UIScreen *Screen = [UIScreen mainScreen];
CGFloat width = Screen.nativeBounds.size.width/Screen.nativeScale;
CGFloat height = Screen.nativeBounds.size.height/Screen.nativeScale;
BOOL isIpad =[[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad;
BOOL hasIPadProWidth = fabs(width - 1024.f) < DBL xss=removed xss=removed xss=removed xss=removed xss=removed xss=removed xss=removed xss=removed xss=removed>> ~/.lldbinit
echo target stop-hook add -o \"target stop-hook disable\" >> ~/.lldbinit
下次從新運行項目，而後就不報錯了。
25. Label行間距
-（void）test{
NSMutableAttributedString *attributedString =
[[NSMutableAttributedString alloc] initWithString:self.contentLabel.text];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
[paragraphStyle setLineSpacing:3];
//調整行間距
[attributedString addAttribute:NSParagraphStyleAttributeName
value:paragraphStyle
range:NSMakeRange(0, [self.contentLabel.text length])];
self.contentLabel.attributedText = attributedString;
}
26. UIImageView填充模式
@"UIViewContentModeScaleToFill", // 拉伸自適應填滿整個視圖 @"UIViewContentModeScaleAspectFit", // 自適應比例大小顯示 @"UIViewContentModeScaleAspectFill", // 原始大小顯示 @"UIViewContentModeRedraw", // 尺寸改變時重繪 @"UIViewContentModeCenter", // 中間 @"UIViewContentModeTop", // 頂部 @"UIViewContentModeBottom", // 底部 @"UIViewContentModeLeft", // 中間貼左 @"UIViewContentModeRight", // 中間貼右 @"UIViewContentModeTopLeft", // 貼左上 @"UIViewContentModeTopRight", // 貼右上 @"UIViewContentModeBottomLeft", // 貼左下 @"UIViewContentModeBottomRight", // 貼右下
27. 宏定義檢測block是否可用
#define BLOCK_EXEC(block, ...) if (block) { block(__VA_ARGS__); };
// 宏定義以前的用法
if (completionBlock) {
completionBlock(arg1, arg2);
}
// 宏定義以後的用法
BLOCK_EXEC(completionBlock, arg1, arg2);
28. Debug欄打印時自動把Unicode編碼轉化成漢字
// 有時候咱們在xcode中打印中文,會打印出Unicode編碼,還須要本身去一些在線網站轉換,有了插件就方便多了。 DXXcodeConsoleUnicodePlugin 插件
29. 設置狀態欄文字樣式顏色
[[UIApplication sharedApplication] setStatusBarHidden:NO]; [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];
30. 自動生成模型代碼的插件
// 可自動生成模型的代碼，省去寫模型代碼的時間 ESJsonFormat-for-Xcode
31. iOS中的一些手勢
輕擊手勢（TapGestureRecognizer） 輕掃手勢（SwipeGestureRecognizer） 長按手勢（LongPressGestureRecognizer） 拖動手勢（PanGestureRecognizer） 捏合手勢（PinchGestureRecognizer） 旋轉手勢（RotationGestureRecognizer）
32. iOS 開發中一些相關的路徑
模擬器的位置: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs 文檔安裝位置: /Applications/Xcode.app/Contents/Developer/Documentation/DocSets 插件保存路徑: ~/Library/ApplicationSupport/Developer/Shared/Xcode/Plug-ins 自定義代碼段的保存路徑: ~/Library/Developer/Xcode/UserData/CodeSnippets/ 若是找不到CodeSnippets文件夾，能夠本身新建一個CodeSnippets文件夾。 證書路徑 ~/Library/MobileDevice/Provisioning Profiles
33. 獲取 iOS 路徑的方法
獲取家目錄路徑的函數 NSString *homeDir = NSHomeDirectory(); 獲取Documents目錄路徑的方法 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *docDir = [paths objectAtIndex:0]; 獲取Documents目錄路徑的方法 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES); NSString *cachesDir = [paths objectAtIndex:0]; 獲取tmp目錄路徑的方法： NSString *tmpDir = NSTemporaryDirectory();
34. 字符串相關操做
去除全部的空格 [str stringByReplacingOccurrencesOfString:@" " withString:@""] 去除首尾的空格 [str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]; - (NSString *)uppercaseString; 所有字符轉爲大寫字母 - (NSString *)lowercaseString 所有字符轉爲小寫字母
35. CocoaPods pod install/pod update更新慢的問題
pod install --verbose --no-repo-update pod update --verbose --no-repo-update 若是不加後面的參數，默認會升級CocoaPods的spec倉庫，加一個參數能夠省略這一步，而後速度就會提高很多。
36. MRC和ARC混編設置方式
在XCode中targets的build phases選項下Compile Sources下選擇 不須要arc編譯的文件 雙擊輸入 -fno-objc-arc 便可 MRC工程中也可使用ARC的類，方法以下： 在XCode中targets的build phases選項下Compile Sources下選擇要使用arc編譯的文件 雙擊輸入 -fobjc-arc 便可
37. 把tableview裏cell的小對勾的顏色改爲別的顏色
_mTableView.tintColor = [UIColor redColor];
38. 調整tableview的separaLine線的位置
tableView.separatorInset = UIEdgeInsetsMake(0, 100, 0, 0);
39. 設置滑動的時候隱藏navigationbar
navigationController.hidesBarsOnSwipe = Yes
40. 自動處理鍵盤事件，實現輸入框防遮擋的插件
IQKeyboardManager https://github.com/hackiftekhar/IQKeyboardManager
41. Quartz2D相關
圖形上下是一個CGContextRef類型的數據。 圖形上下文包含： 1，繪圖路徑（各類各樣圖形） 2，繪圖狀態（顏色，線寬，樣式，旋轉，縮放，平移） 3，輸出目標（繪製到什麼地方去？UIView、圖片） 1，獲取當前圖形上下文 CGContextRef ctx = UIGraphicsGetCurrentContext(); 2，添加線條 CGContextMoveToPoint(ctx, 20, 20); 3，渲染 CGContextStrokePath(ctx); CGContextFillPath(ctx); 4，關閉路徑 CGContextClosePath(ctx); 5，畫矩形 CGContextAddRect(ctx, CGRectMake(20, 20, 100, 120)); 6，設置線條顏色 [[UIColor redColor] setStroke]; 7， 設置線條寬度 CGContextSetLineWidth(ctx, 20); 8，設置頭尾樣式 CGContextSetLineCap(ctx, kCGLineCapSquare); 9，設置轉折點樣式 CGContextSetLineJoin(ctx, kCGLineJoinBevel); 10，畫圓 CGContextAddEllipseInRect(ctx, CGRectMake(30, 50, 100, 100)); 11，指定圓心 CGContextAddArc(ctx, 100, 100, 50, 0, M_PI * 2, 1); 12，獲取圖片上下文 UIGraphicsGetImageFromCurrentImageContext(); 13，保存圖形上下文 CGContextSaveGState(ctx) 14，恢復圖形上下文 CGContextRestoreGState(ctx)
42. 屏幕截圖
// 1. 開啓一個與圖片相關的圖形上下文
UIGraphicsBeginImageContextWithOptions(self.view.bounds.size,NO,0.0);
// 2. 獲取當前圖形上下文
CGContextRef ctx = UIGraphicsGetCurrentContext();
// 3. 獲取須要截取的view的layer
[self.view.layer renderInContext:ctx];
// 4. 從當前上下文中獲取圖片
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
// 5. 關閉圖形上下文
UIGraphicsEndImageContext();
// 6. 把圖片保存到相冊
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
第二種寫法javascript
/**
*截圖功能
*/
-(void)screenShot{
CGRect rect = self.view.frame;
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
[self.view.layer renderInContext:context];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
i = [[UIImageView alloc]initWithFrame:CGRectMake(20, 70, 300, 500)];
i.layer.borderColor = [UIColor redColor].CGColor;
i.layer.borderWidth = 2;
i.image = img;
[self.view addSubview:i];
i.userInteractionEnabled = YES;
//tap手勢
UITapGestureRecognizer *tapGesture=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(event:)];
[i addGestureRecognizer:tapGesture];
[tapGesture setNumberOfTapsRequired:1];
}
43. 隱藏導航欄上的返回字體
//Swift UIBarButtonItem.appearance().setBackButtonTitlePositionAdjustment(UIOffsetMake(0, -60), forBarMetrics: .Default) //OC [[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60) forBarMetrics:UIBarMetricsDefault];
44. 解決tableview的分割線短一截
-(void)viewDidLayoutSubviews{
if ([self.tableView respondsToSelector:@selector(setSeparatorInset:)])
{
[self.tableView setSeparatorInset:UIEdgeInsetsMake(0,0,0,0)];
}
if ([self.tableView respondsToSelector:@selector(setLayoutMargins:)])
{
[self.tableView setLayoutMargins:UIEdgeInsetsMake(0,0,0,0)];
}
}
-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath{
if ([cell respondsToSelector:@selector(setSeparatorInset:)])
{
[cell setSeparatorInset:UIEdgeInsetsZero];
}
if ([cell respondsToSelector:@selector(setLayoutMargins:)])
{
[cell setLayoutMargins:UIEdgeInsetsZero];
}
}
45. 動態隱藏NavigationBar
//1.當咱們的手離開屏幕時候隱藏
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset
{
if(velocity.y > 0)
{
[self.navigationController setNavigationBarHidden:YES animated:YES];
} else {
[self.navigationController setNavigationBarHidden:NO animated:YES];
}
}
velocity.y這個量，在上滑和下滑時，變化極小（小數），可是由於方向不一樣，有正負之分，這就很好處理了。
//2.在滑動過程當中隱藏
//像safari
(1)
self.navigationController.hidesBarsOnSwipe = YES;
(2)
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
CGFloat offsetY = scrollView.contentOffset.y + __tableView.contentInset.top;
CGFloat panTranslationY = [scrollView.panGestureRecognizer translationInView:self.tableView].y;
if (offsetY > 64) {
if (panTranslationY > 0)
{
//下滑趨勢，顯示
[self.navigationController setNavigationBarHidden:NO animated:YES];
} else {
//上滑趨勢，隱藏
[self.navigationController setNavigationBarHidden:YES animated:YES];
}
} else {
[self.navigationController setNavigationBarHidden:NO animated:YES];
}
}
這裏的offsetY > 64只是爲了在視圖滑過navigationBar的高度以後纔開始處理，防止影響展現效果。panTranslationY是scrollView的pan手勢的手指位置的y值，可能不是太好，由於panTranslationY這個值在較小幅度上下滑動時，可能都爲正或都爲負，這就使得這一方式不太靈敏.
效果圖php
46. 設置導航欄透明
1第一種方式css
//方法一:設置透明度
[[[self.navigationController.navigationBar subviews]objectAtIndex:0] setAlpha:0.1];
//方法二:設置背景圖片
/**
* 設置導航欄,使其透明
*
*/
- (void)setNavigationBarColor:(UIColor *)color targetController:(UIViewController *)targetViewController{
//導航條的顏色 以及隱藏導航條的顏色targetViewController.navigationController.navigationBar.shadowImage = [[UIImage alloc]init];
CGRect rect=CGRectMake(0.0f, 0.0f, 1.0f, 1.0f); UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetFillColorWithColor(context, [color CGColor]); CGContextFillRect(context, rect);
UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); [targetViewController.navigationController.navigationBar setBackgroundImage:theImage forBarMetrics:UIBarMetricsDefault];
}
二、設置透明導航欄html
當即投資BG爲默認的導航欄 背景圖片 java
透明navbarBG 是一張純透明的png 圖片python
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
[self createNav];
}
- (void)createNav
{
//替換導航欄透明
UINavigationBar *navigationBar = self.navigationController.navigationBar;
[navigationBar setTitleTextAttributes:@{
NSForegroundColorAttributeName :[UIColor whiteColor]
}];
//navigationBar.alpha = 0;
[navigationBar setBackgroundImage:[UIImage imageNamed:@"透明navbarBG"] forBarMetrics:UIBarMetricsDefault];
[navigationBar setBackgroundImage:[UIImage imageNamed:@"透明navbarBG"] forBarMetrics:UIBarMetricsCompact];
//去黑線
[navigationBar setBackgroundImage:[UIImage imageNamed:@"透明navbarBG"] forBarPosition:UIBarPositionAny barMetrics:UIBarMetricsDefault];
[navigationBar setShadowImage:[UIImage new]];
}
//退出頁面時候 恢復不透明
-(void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
[self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"當即投資BG"] forBarMetrics:UIBarMetricsDefault];
[self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"當即投資BG"] forBarMetrics:UIBarMetricsCompact];
}
// 當滾動視圖滾動到最頂端後，執行該方法
//向上滾動時候不透明
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
// NSLog(@"scrollViewDidScroll");
CGPoint point=scrollView.contentOffset;
if(point.y>5){
[self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"當即投資BG"] forBarMetrics:UIBarMetricsDefault];
[self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"當即投資BG"] forBarMetrics:UIBarMetricsCompact];
self.navigationController.navigationBar.barTintColor=[UIColor colorWithRed:243/255.0 green:90.0/255.0 blue:3.0/255.0 alpha:1.0];
}else{
UINavigationBar *navigationBar = self.navigationController.navigationBar;
[navigationBar setTitleTextAttributes:@{
NSForegroundColorAttributeName :[UIColor whiteColor]
}];
//navigationBar.alpha = 0;
[navigationBar setBackgroundImage:[UIImage imageNamed:@"透明navbarBG"] forBarMetrics:UIBarMetricsDefault];
[navigationBar setBackgroundImage:[UIImage imageNamed:@"透明navbarBG"] forBarMetrics:UIBarMetricsCompact];
}
// NSLog(@"%f,%f",point.x,point.y);
// 從中能夠讀取contentOffset屬性以肯定其滾動到的位置。
// 注意：當ContentSize屬性小於Frame時，將不會出發滾動
}
47. 設置字體和行間距
//設置字體和行間距
UILabel * lable = [[UILabel alloc]initWithFrame:CGRectMake(50, 100, 300, 200)];
lable.text = @"你們好,我是Frank_chun,在這裏咱們一塊兒學習新的知識,總結咱們遇到的那些坑,共同的學習,共同的進步,共同的努力,只爲美好的明天!!!有問題一塊兒相互的探討--438637472!!!";
lable.numberOfLines = 0;
lable.font = [UIFont systemFontOfSize:12];
lable.backgroundColor = [UIColor grayColor];
[self.view addSubview:lable];
//設置每一個字體之間的間距
//NSKernAttributeName 這個對象所對應的值是一個NSNumber對象(包含小數),做用是修改默認字體之間的距離調整,值爲0的話表示字距調整是禁用的; NSMutableAttributedString * str = [[NSMutableAttributedString alloc]initWithString:lable.text attributes:@{NSKernAttributeName:@(5.0)}];
//設置某寫字體的顏色
//NSForegroundColorAttributeName 設置字體顏色
NSRange blueRange = NSMakeRange([[str string] rangeOfString:@"Frank_chun"].location, [[str string] rangeOfString:@"Frank_chun"].length);
[str addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:blueRange];
NSRange blueRange1 = NSMakeRange([[str string] rangeOfString:@"438637472"].location, [[str string] rangeOfString:@"438637472"].length);
[str addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:blueRange1];
//設置每行之間的間距
//NSParagraphStyleAttributeName 設置段落的樣式
NSMutableParagraphStyle * par = [[NSMutableParagraphStyle alloc]init];
[par setLineSpacing:20];
//爲某一範圍內文字添加某個屬性
//NSMakeRange表示所要的範圍,從0到整個文本的長度
[str addAttribute:NSParagraphStyleAttributeName value:par range:NSMakeRange(0, lable.text.length)]; [lable setAttributedText:str];
效果圖git
48. 點擊button倒計時
//第一種方法
//點擊button倒計時
#import "ViewController.h"
@interface ViewController ()
@property (nonatomic, strong) UIButton * timeButton;
@property (nonatomic, strong) NSTimer * timer;
@property (nonatomic, strong)UIButton * btn;
@end@implementation ViewController
{
NSInteger _time;
}
- (void)viewDidLoad {
[super viewDidLoad];
_time = 5;
self.btn = [UIButton buttonWithType:UIButtonTypeCustom]; _btn.backgroundColor = [UIColor orangeColor];
[_btn setTitle:@"獲取驗證碼" forState:UIControlStateNormal]; _btn.titleLabel.font = [UIFont systemFontOfSize:15];
[_timeButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[_btn addTarget:self action:@selector(btnAction:) forControlEvents:UIControlEventTouchUpInside];
[self refreshButtonWidth];
[self.view addSubview:self.btn];
}
- (void)refreshButtonWidth{
CGFloat width = 0;
if (_btn.enabled){
width = 100;
} else {
width = 200;
}
_btn.center = CGPointMake(self.view.frame.size.width/2, 200);
_btn.bounds = CGRectMake(0, 0, width, 40);
//每次刷新，保證區域正確
[_btn setBackgroundImage:[self imageWithColor:[UIColor orangeColor] andSize:_btn.frame.size] forState:UIControlStateNormal];
[_btn setBackgroundImage:[self imageWithColor:[UIColor lightGrayColor] andSize:_btn.frame.size] forState:UIControlStateDisabled];
}
- (UIImage *)imageWithColor:(UIColor *)color andSize:(CGSize)aSize{
CGRect rect = CGRectMake(0.0f, 0.0f, aSize.width, aSize.height); UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetFillColorWithColor(context, [color CGColor]); CGContextFillRect(context, rect);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext();
return image;
}
- (void)btnAction:(UIButton *)sender{
sender.enabled = NO;
[self refreshButtonWidth];
[sender setTitle:[NSString stringWithFormat:@"獲取驗證碼(%zi)", _time] forState:UIControlStateNormal];
_timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(timeDown) userInfo:nil repeats:YES];
}
- (void)timeDown{
_time --;
if (_time == 0) {
[_btn setTitle:@"從新獲取" forState:UIControlStateNormal]; _btn.enabled = YES;
[self refreshButtonWidth];
[_timer invalidate];
_timer = nil;
_time = 5 ;
return;
}
[_btn setTitle:[NSString stringWithFormat:@"獲取驗證碼(%zi)", _time] forState:UIControlStateNormal];
}
//第二種方法
#pragma mark -點擊發送驗證碼
- (void)sendMessage:(UIButton *)btn{
if (self.phoneField.text.length == 0) {
[self remindMessage:@"請輸入正確的手機號"];
}else{
__block int timeout=60;
//倒計時時間
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); dispatch_source_t _timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0,queue); dispatch_source_set_timer(_timer,dispatch_walltime(NULL, 0),1.0*NSEC_PER_SEC, 0);
//每秒執行
dispatch_source_set_event_handler(_timer, ^{
if(timeout<=0){
//倒計時結束，關閉
dispatch_source_cancel(_timer); dispatch_async(dispatch_get_main_queue(), ^{
// 設置界面的按鈕顯示 根據本身需求設置
[btn setTitle:@"發送驗證碼" forState:UIControlStateNormal]; btn.userInteractionEnabled = YES;
});
}else{
int seconds = timeout % 60;
NSString *strTime = [NSString stringWithFormat:@"%d", seconds];
if ([strTime isEqualToString:@"0"]) {
strTime = [NSString stringWithFormat:@"%d",60];
}
dispatch_async(dispatch_get_main_queue(), ^{
//設置界面的按鈕顯示 根據本身需求設置
//NSLog(@"____%@",strTime);
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1];
[btn setTitle:[NSString stringWithFormat:@"%@秒後從新發送",strTime] forState:UIControlStateNormal];
[UIView commitAnimations];
btn.userInteractionEnabled = NO;
});
timeout--;
}
});
dispatch_resume(_timer);
}
效果圖github
49. UITextField默認佔位符是居中顯示,讓其居上顯示
textField.contentVerticalAlignment = UIControlContentVerticalAlignmentTop;
50. 解決同時按兩個按鈕進兩個view的問題
[button setExclusiveTouch:YES];
51. 圖片拉伸
UIImage* img=[UIImage imageNamed:@"2.png"];//原圖 UIEdgeInsets edge=UIEdgeInsetsMake(0, 10, 0,10); //UIImageResizingModeStretch：拉伸模式，經過拉伸UIEdgeInsets指定的矩形區域來填充圖片 //UIImageResizingModeTile：平鋪模式，經過重複顯示UIEdgeInsets指定的矩形區域來填充圖 img= [img resizableImageWithCapInsets:edge resizingMode:UIImageResizingModeStretch]; self.imageView.image=img;
52. 修改textFieldplaceholder字體顏色和大小
textField.placeholder = @"username is in here!"; [textField setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"]; [textField setValue:[UIFont boldSystemFontOfSize:16] forKeyPath:@"_placeholderLabel.font"];
53. 修改狀態欄字體顏色
只能設置兩種顏色，黑色和白色，系統默認黑色 設置爲白色方法： （1）在plist裏面添加Status bar style，值爲UIStatusBarStyleLightContent（白色）或UIStatusBarStyleDefault（黑 色） （2）在Info.plist中設置UIViewControllerBasedStatusBarAppearance 爲NO
54. 去掉導航欄下邊的黑線
[self.navigationController.navigationBar setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault]; self.navigationController.navigationBar.shadowImage = [[UIImage alloc] init];
55. 修改pagecontrol顏色
_pageControl.currentPageIndicatorTintColor=SFQRedColor; _pageControl.pageIndicatorTintColor=SFQGrayColor;
56. 去掉UITableView的section的粘性，使其不會懸停
//有時候使用UITableView所實現的列表，會使用到section，可是又不但願它粘在最頂上而是跟隨滾動而消失或者出現
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
if (scrollView == _tableView) {
CGFloat sectionHeaderHeight = 36;
if (scrollView.contentOffset.y <= sectionHeaderHeight && scrollView.contentOffset.y >= 0) {
scrollView.contentInset = UIEdgeInsetsMake(-scrollView.contentOffset.y, 0, 0, 0);
} else if (scrollView.contentOffset.y >= sectionHeaderHeight) {
scrollView.contentInset = UIEdgeInsetsMake(-sectionHeaderHeight, 0, 0, 0);
}
}
}
57. 經過2D仿射函數實現小的動畫效果(變大縮小) --可用於自定義pageControl中
[UIView animateWithDuration:0.3 animations:^{
imageView.transform = CGAffineTransformMakeScale(2, 2);
} completion:^(BOOL finished) {
imageView.transform = CGAffineTransformMakeScale(1.0, 1.0);
}];
58. UIImage與字符串互轉
//圖片轉字符串
-(NSString *)UIImageToBase64Str:(UIImage *) image
{
NSData *data = UIImageJPEGRepresentation(image, 1.0f);
NSString *encodedImageStr = [data base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
return encodedImageStr;
}
//字符串轉圖片
-(UIImage *)Base64StrToUIImage:(NSString *)_encodedImageStr
{
NSData *_decodedImageData = [[NSData alloc] initWithBase64Encoding:_encodedImageStr];
UIImage *_decodedImage = [UIImage imageWithData:_decodedImageData];
return _decodedImage;
}
59. 判斷NSString中是否包含中文
-(BOOL)isChinese:(NSString *)str{
NSString *match=@"(^[\u4e00-\u9fa5]+$)";
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF matches %@", match];
return [predicate evaluateWithObject:str];
}
60. NSDate與NSString的相互轉化
-(NSString *)dateToString:(NSDate *)date {
// 初始化時間格式控制器
NSDateFormatter *matter = [[NSDateFormatter alloc] init];
// 設置設計格式
[matter setDateFormat:@"yyyy-MM-dd hh:mm:ss zzz"];
// 進行轉換
NSString *dateStr = [matter stringFromDate:date];
return dateStr;
}
-(NSDate *)stringToDate:(NSString *)dateStr {
// 初始化時間格式控制器
NSDateFormatter *matter = [[NSDateFormatter alloc] init];
// 設置設計格式
[matter setDateFormat:@"yyyy-MM-dd hh:mm:ss zzz"];
// 進行轉換
NSDate *date = [matter dateFromString:dateStr];
return date;
}
6一、imageView添加手勢
imageview.userInteractionEnabled = YES;
//tap手勢
UITapGestureRecognizer *tapGesture=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(event:)];
[imageview addGestureRecognizer:tapGesture];
[tapGesture setNumberOfTapsRequired:1];
- (void)event:(UITapGestureRecognizer *)gesture
{
NSLog(@"單擊");
}
6二、獲取請求鏈接裏邊的cookies
#pragma mark //獲取請求鏈接的cookies
[manager POST:urlStr parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) {
if (success) {
success(responseObject);
NSDictionary *fields = [operation.response allHeaderFields]; //afnetworking寫法
NSLog(@"fields = %@",[fields description]);
// NSURL *url = [NSURL URLWithString:@"http://api.skyfox.org/api-test.php"];
NSURL *url = [NSURL URLWithString:urlStr];
//獲取cookie方法1
NSArray *cookies = [NSHTTPCookie cookiesWithResponseHeaderFields:fields forURL:url];
NSLog(@"11--%@",cookies);
//獲取cookie方法2
//NSString *cookieString = [[HTTPResponse allHeaderFields] valueForKey:@"Set-Cookie"];
}
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
// NSLog(@"%@", error);
if (fail) {
fail();
}
}];
63圖片旋轉
imageView1 .transform=CGAffineTransformMakeRotation(M_PI_2);
6四、獲取字符串在label中須要的寬度
#pragma mark //獲取字符串須要的寬度
+(CGFloat)ZFYtextWidthFromTextString:(NSString *)text fontSize:(CGFloat)size{
CGSize size1 = [text sizeWithAttributes:@{NSFontAttributeName: [UIFont systemFontOfSize:size]}]; //返回計算出的行高
return size1.width;
}
6五、獲取字符串在label中須要的高度
#pragma mark//獲取字符串須要的高度
+(CGFloat)ZFYtextHeightFromTextString:(NSString *)text width:(CGFloat)textWidth fontSize:(CGFloat)size{
NSDictionary *dict = @{NSFontAttributeName:[UIFont systemFontOfSize:size]};
CGRect rect = [text boundingRectWithSize:CGSizeMake(textWidth, MAXFLOAT) options:NSStringDrawingTruncatesLastVisibleLine|NSStringDrawingUsesFontLeading|NSStringDrawingUsesLineFragmentOrigin attributes:dict context:nil];
//返回計算出的行高
return rect.size.height;
}
6六、漢字和Unicode編碼轉換
#pragma mark//Unicode轉漢字 \u5f20\u4e09 → 張三
- (NSString *)replaceUnicode:(NSString *)unicodeStr {
//張三 \u5f20\u4e09
NSString *tempStr1 = [unicodeStr stringByReplacingOccurrencesOfString:@"\\u" withString:@"\\U"];
NSString *tempStr2 = [tempStr1 stringByReplacingOccurrencesOfString:@"\"" withString:@"\\\""];
NSString *tempStr3 = [[@"\"" stringByAppendingString:tempStr2] stringByAppendingString:@"\""];
NSData *tempData = [tempStr3 dataUsingEncoding:NSUTF8StringEncoding];
NSString* returnStr = [NSPropertyListSerialization propertyListFromData:tempData
mutabilityOption:NSPropertyListImmutable
format:NULL
errorDescription:NULL];
// NSLog(@"Output = %@", returnStr);
return [returnStr stringByReplacingOccurrencesOfString:@"\\r\\n" withString:@"\n"];
}
#pragma mark//漢字轉 Unicode 張三 → \u5f20\u4e09
-(NSString *) utf8ToUnicode:(NSString *)string{
NSUInteger length = [string length];
NSMutableString *s = [NSMutableString stringWithCapacity:0];
for (int i = 0;i < length; i++){
unichar _char = [string characterAtIndex:i];
//判斷是否爲英文和數字
if (_char <= '9' && _char >='0'){
[s appendFormat:@"%@",[string substringWithRange:NSMakeRange(i,1)]];
}else if(_char >='a' && _char <= 'z'){
[s appendFormat:@"%@",[string substringWithRange:NSMakeRange(i,1)]];
}else if(_char >='A' && _char <= 'Z')
{
[s appendFormat:@"%@",[string substringWithRange:NSMakeRange(i,1)]];
}else{
[s appendFormat:@"\\u%x",[string characterAtIndex:i]];
}
}
return s;
}
6七、獲取間隔一天 一年一秒以後的時間
#pragma mark //獲取相對時間 獲取兩個月前的時間 -2 爲兩個月前時間 2爲兩個月後時間
- (void)RelativeTime {
NSDateComponents * components = [[NSDateComponents alloc] init];
components.month = -2;
// components.day = 10;
// components.hour = 10;
NSCalendar * calendar = [NSCalendar currentCalendar];
NSDate * currentDate = [NSDate date];
NSDate * nextData = [calendar dateByAddingComponents:components toDate:currentDate options:NSCalendarMatchStrictly];
NSDateFormatter * formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = @"yyyy年MM月dd日HH時mm分ss秒";
NSString * str = [formatter stringFromDate:nextData];
NSLog(@"%@",str);
}
6八、打印系統字體庫名字
#pragma mark 打印系統字體庫 名字
NSArray *familyNames = [UIFont familyNames];
for( NSString *familyName in familyNames )
{
printf( "Family: %s \n", [familyName UTF8String]);
NSArray *fontNames = [UIFont fontNamesForFamilyName:familyName];
for( NSString *fontName in fontNames )
{
printf( "\tFont: %s \n", [fontName UTF8String] );
}
}
6九、 截取正方形的圖片
//截取正方形的圖片 centerBool爲YES 表示從中心開始截取
+(UIImage*)getSubImage:(UIImage *)image mCGRect:(CGRect)mCGRect centerBool:(BOOL)centerBool{
/*如若centerBool爲Yes則是由中心點取mCGRect範圍的圖片*/
float imgWidth = image.size.width;
float imgHeight = image.size.height;
float viewWidth = mCGRect.size.width;
float viewHidth = mCGRect.size.height;
CGRect rect;
if(centerBool)
rect = CGRectMake((imgWidth-viewWidth)/2,(imgHeight-viewHidth)/2,viewWidth,viewHidth);
else{
if(viewHidth<viewWidth)
{
if(imgWidth<= imgHeight)
{
rect=CGRectMake(0, 0,imgWidth, imgWidth*viewHidth/viewWidth);
}else
{
float width = viewWidth*imgHeight/viewHidth;
float x = (imgWidth - width)/2;
if(x>0)
{
rect = CGRectMake(x,0, width, imgHeight);
}else
{
rect = CGRectMake(0, 0, imgWidth, imgWidth*viewHidth/viewWidth);
}
}
}else
{
if(imgWidth <= imgHeight)
{
float height = viewHidth*imgWidth/viewWidth;
if(height< imgHeight)
{
rect =CGRectMake(0, 0, imgWidth, height);
}else
{
rect = CGRectMake(0, 0,viewWidth*imgHeight/viewHidth, imgHeight);
}
}else
{
float width = viewWidth*imgHeight/viewHidth;
if(width< imgWidth)
{
float x = (imgWidth - width)/2;
rect =CGRectMake(x, 0,width, imgHeight);
}else
{
rect =CGRectMake(0, 0,imgWidth, imgHeight);
}
}
}
}
CGImageRef subImageRef = CGImageCreateWithImageInRect(image.CGImage,rect);
CGRect smallBounds =CGRectMake(0, 0,CGImageGetWidth(subImageRef),CGImageGetHeight(subImageRef));
UIGraphicsBeginImageContext(smallBounds.size); CGContextRef context =UIGraphicsGetCurrentContext();CGContextDrawImage(context, smallBounds, subImageRef);
UIImage *smallImage =[UIImage imageWithCGImage:subImageRef];
UIGraphicsEndImageContext();
return smallImage;
}
70、跳轉APPstore
//APPid就是上面的那串數字 NSString *urlStr = [NSString stringWithFormat:@"itms-apps://itunes.apple.com/app/id%@",APPID]; NSURL *url = [NSURLURLWithString:urlStr]; [[UIApplicationsharedApplication]openURL:url];
7一、 獲取本機APP 版本號
#pragma mark -- //獲取本地版本號
//獲取本地版本號
NSString* thisVersion = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleShortVersionString"];
7二、獲取APP store 項目版本號
#pragma mark -- 獲取appstore版本號
-(void)Postpath:(NSString *)path
{
NSString *url = [[NSString alloc] initWithFormat:@"http://itunes.apple.com/lookup?id=%@",@"414478124"];
NSURL *url = [NSURL URLWithString:path];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url
cachePolicy:NSURLRequestReloadIgnoringCacheData
timeoutInterval:10];
[request setHTTPMethod:@"POST"];
NSOperationQueue *queue = [NSOperationQueue new];
[NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse *response,NSData *data,NSError *error){
NSMutableDictionary *receiveStatusDic=[[NSMutableDictionary alloc]init];
if (data) {
NSDictionary *receiveDic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];
if ([[receiveDic valueForKey:@"resultCount"] intValue]>0) {
[receiveStatusDic setValue:@"1" forKey:@"status"];
[receiveStatusDic setValue:[[[receiveDic valueForKey:@"results"] objectAtIndex:0] valueForKey:@"version"] forKey:@"version"];
}else{
[receiveStatusDic setValue:@"-1" forKey:@"status"];
}
}else{
[receiveStatusDic setValue:@"-1" forKey:@"status"];
}
[self performSelectorOnMainThread:@selector(receiveData:) withObject:receiveStatusDic waitUntilDone:NO];
}];
}
-(void)receiveData:(id)sender
{
NSLog(@"receiveData=%@",sender); //打印獲取到的版本號
}
7三、取消全部響應者（關閉全部鍵盤）
//取消窗口第一響應 [[[UIApplication sharedApplication] keyWindow] endEditing:YES];
7四、加載html時候 讓大圖不超出屏幕
//css 控制
<head><style>img{width:100%% !important;}</style></head>
//js 控制
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
[webView stringByEvaluatingJavaScriptFromString: @"var script = document.createElement('script');"
"script.type = 'text/javascript';"
"script.text = /"function ResizeImages() { "
"var myimg,oldwidth,oldheight;"
"var maxwidth=320;"// 圖片寬度
"for(i=0;i maxwidth){"
"myimg.width = maxwidth;"
"}"
"}"
"}/";"
"document.getElementsByTagName('head')[0].appendChild(script);"];
[webView stringByEvaluatingJavaScriptFromString:@"ResizeImages();"];
}
7五、監聽textfiled的輸入狀況
#pragma mark UITextField ----監聽
[timesField addTarget:self
action:@selector(textFieldDidChange:)
forControlEvents:UIControlEventEditingChanged]; // 監聽事件
監聽事件:
// 監聽改變按鈕
- (void) textFieldDidChange:(UITextField*) textField {
}
7六、頁面跳轉返回按鈕的文字
///設置push 以後返回按鈕的 字體 UIBarButtonItem *backbutton = [[UIBarButtonItem alloc]init]; backbutton.title = @""; self.navigationItem.backBarButtonItem = backbutton;
7七、/跳轉以後隱藏 返回鍵
life.navigationItem.hidesBackButton = YES;
7八、計算webview的高
- (void)webViewDidFinishLoad:(UIWebView *)aWebView {
CGRect frame = aWebView.frame;
frame.size.height = 1;
aWebView.frame = frame;
CGSize fittingSize = [aWebView sizeThatFits:CGSizeZero];
frame.size = fittingSize;
aWebView.frame = frame;
NSLog(@"size: %f, %f", fittingSize.width, fittingSize.height);
}
7九、設置陰影
#pragma mark //設置 陰影
[[self.calendarView layer] setShadowOffset:CGSizeMake(0, 0)];
[[self.calendarView layer] setShadowRadius:3];
[[self.calendarView layer] setShadowOpacity:0.4] ;
[[self.calendarView layer] setShadowColor:[UIColor blackColor].CGColor];
80、對鍵盤的監聽
#pragma mark 鍵盤監聽
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWasShown:)
name:UIKeyboardWillShowNotification object:nil];
//註冊鍵盤消失的通知
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillBeHidden:)
name:UIKeyboardWillHideNotification object:nil];
- (void)keyboardWasShown:(NSNotification*)aNotification
{
//鍵盤高度
NSDictionary *userInfo = [aNotification userInfo];
//NSLog(@"%@",userInfo);
NSValue *aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
CGRect keyboardRect = [aValue CGRectValue];
NSInteger height = keyboardRect.size.height;
CGFloat time = [[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];
}
-(void)keyboardWillBeHidden:(NSNotification*)aNotification
{
}
8一、禁止webview 滾動
#pragma mark //禁止微webview 上下拖動
UIWebView * d_intro = [[UIWebView alloc] init];
d_intro.delegate = self;
d_intro.dataDetectorTypes = UIDataDetectorTypeLink;
//取消右側，下側滾動條，去處上下滾動邊界的黑色背景
d_intro.backgroundColor=[UIColor clearColor];
for (UIView *_aView in [d_intro subviews])
{
if ([_aView isKindOfClass:[UIScrollView class]])
{
[(UIScrollView *)_aView setShowsVerticalScrollIndicator:NO];
//右側的滾動條
[(UIScrollView *)_aView setShowsHorizontalScrollIndicator:NO];
//下側的滾動條
for (UIView *_inScrollview in _aView.subviews)
{
if ([_inScrollview isKindOfClass:[UIImageView class]])
{
_inScrollview.hidden = YES; //上下滾動出邊界時的黑色的圖片
}
}
}
}
[self.view addSubview:d_intro];
8二、圖片保存本地沙盒、
#pragma mark 圖片保存沙盒
- (void)setHeadBgImage
{
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
//NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths firstObject];
NSString *imageFilePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"selfPhoto%d.jpg", [LoginManager sharedManager].userBasicInfo.uid]];
success = [fileManager fileExistsAtPath:imageFilePath];
UIImage *image1 = nil;
if ([LoginManager sharedManager].loginSucess) {
if (success) {
NSData *data = [fileManager contentsAtPath:imageFilePath];
image1 = [UIImage imageWithData:data];
}
}else{
image1 = [UIImage imageNamed:@"account_head_bg"];
}
// NSLog(@"%@-%u",imageFilePath,success);
[self setHeadBGImage:image1];
}
- (void)saveImage:(UIImage *)image
{
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths firstObject];
NSString *imageFilePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"selfPhoto%d.jpg", [LoginManager sharedManager].userBasicInfo.uid]];
success = [fileManager fileExistsAtPath:imageFilePath];
if (success) {
success = [fileManager removeItemAtPath:imageFilePath error:&error];
}
BOOL result = [UIImagePNGRepresentation(image)writeToFile: imageFilePath atomically:YES]; // 保存成功會返回YES
//UIImage *smallImage = [self thumbnailWithImageWithoutScale:image size:CGSizeMake(self.view.frame.size.width, 315)];
NSLog(@"%@-%u",imageFilePath,result);
[self setHeadBGImage:image];
}
8三、圖片旋轉360度
#pragma mark //旋轉360 度 動畫
-(void) startAnimation
{
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.01];
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:@selector(endAnimation)];
_rechargeCover.transform = CGAffineTransformMakeRotation(angle * (M_PI / 180.0f));
NSLog(@"%f",angle * (M_PI / 180.0f));
[UIView commitAnimations];
}
-(void)endAnimation
{
angle += 10;
if (angle < 360) {
[self startAnimation];
}
}
8四、經常使用宏
#define DeviceMaxHeight ([UIScreen mainScreen].bounds.size.height) #define DeviceMaxWidth ([UIScreen mainScreen].bounds.size.width) #define widthRate DeviceMaxWidth/320 #define IOS8 ([[UIDevice currentDevice].systemVersion intValue] >= 8 ? YES : NO) // RGB顏色 #define UIColorFromRGB1(r, g, b) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:1.0] #define UIColorFromRGB(rgbValue) [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]
8五、獲取故事版的 vc
UIStoryboard *login = [UIStoryboard storyboardWithName:@"LoginModule" bundle:nil]; AlsNoticeController* alsNoticeController = [login instantiateViewControllerWithIdentifier:@"LoginVC"]; [self.navigationController pushViewController:alsNoticeController animated:YES];
8六、設置windows覆蓋層
#pragma mark //設置覆蓋層視圖
if (![[NSUserDefaults standardUserDefaults] boolForKey:@"guideFirst"]) {
_guideCoverView =[[UIView alloc]initWithFrame:self.view.bounds];
_guideCoverView.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.6];
UIWindow* currentWindow = [UIApplication sharedApplication].keyWindow;
[currentWindow addSubview:_guideCoverView];
}
8七、設置透明度而且不影響子視圖
#pragma mark 視圖透明度 不影響子視圖 alterView.backgroundColor=[[UIColor whiteColor] colorWithAlphaComponent:1];
8八、剪切板的複製
#pragma mark 複製到系統剪切版 UIPasteboard *pasteboard = [UIPasteboard generalPasteboard]; pasteboard.string = self.label.text;
8九、cocoPods經常使用指令
#pragma mark cocosPods指令 pod install --verbose --no-repo-update pod list 列出全部可用的第三方庫 pod search query 搜包含query的第三方庫 注意:這兩個命令只搜存在於本地 /Users/yohunl/.cocoapods/ 下的文件 若是搜索網絡的,能夠先更新本地 pod repo update master,而後再搜索 pod lib create frameworkName 建立一個framework工程 pod lib lint 驗證一個podspec文件是否有錯誤 podinstall --no-repo-update錯誤 這裏的參數—no-repo-update,是告訴cocoapods不要更新repo.有麼有感受每次pod install都很慢,那是由於每一次都會先更新本地的repo,加上此參數,就跳過了這個過程,將會很快 pod init 能夠創建一個空的podfile 創建pod的spec文件 pod spec create spec名字 http://www.theonlylars.com/blog/2013/01/20/cocoapods-creating-a-pod-spec/ pod install 命令時會引起許多操做。要想深刻了解這個命令執行的詳細內容，能夠在這個命令後面加上 --verbose
90、背景圖片按照某個像素拉伸web
self.messageImage.image = [[UIImage imageNamed:@"bbs_meaasge_frame"] stretchableImageWithLeftCapWidth:150 topCapHeight:20];
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