iOS經常使用公共方法

1. 獲取磁盤總空間大小

//磁盤總空間
+ (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. 獲取磁盤可用空間大小

//磁盤可用空間
+ (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;
}

5. 獲取字符串(或漢字)首字母

//獲取字符串(或漢字)首字母
+ (NSString *)firstCharacterWithString:(NSString *)string{
    NSMutableString *str = [NSMutableString stringWithString:string];
    CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformMandarinLatin, NO);
    CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformStripDiacritics, NO);
    NSString *pingyin = [str capitalizedString];
    return [pingyin substringToIndex:1];
}

6. 將字符串數組按照元素首字母順序進行排序分組

//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 = [UILocalizedIndexedCollation 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;
}
 
//獲取字符串(或漢字)首字母
+ (NSString *)firstCharacterWithString:(NSString *)string{
    NSMutableString *str = [NSMutableString stringWithString:string];
    CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformMandarinLatin, NO);
    CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformStripDiacritics, NO);
    NSString *pingyin = [str capitalizedString];
    return [pingyin substringToIndex:1];
}

7. 獲取當前時間

//獲取當前時間
//format: @"yyyy-MM-dd HH:mm:ss"、@"yyyy年MM月dd日 HH時mm分ss秒"
+ (NSString *)currentDateWithFormat:(NSString *)format{
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:format];
    return [dateFormatter stringFromDate:[NSDate date]];
}

8. 計算上第二天期距離如今多久, 如 xx 小時前、xx 分鐘前等

/**
 *  計算上第二天期距離如今多久
 *
 *  @param lastTime    上第二天期(須要和格式對應)
 *  @param format1     上第二天期格式
 *  @param currentTime 最近日期(須要和格式對應)
 *  @param format2     最近日期格式
 *
 *  @return xx分鐘前、xx小時前、xx天前
 */
+ (NSString *)timeIntervalFromLastTime:(NSString *)lastTime
                        lastTimeFormat:(NSString *)format1
                         ToCurrentTime:(NSString *)currentTime
                     currentTimeFormat:(NSString *)format2{
    //上次時間
    NSDateFormatter *dateFormatter1 = [[NSDateFormatter alloc]init];
    dateFormatter1.dateFormat = format1;
    NSDate *lastDate = [dateFormatter1 dateFromString:lastTime];
    //當前時間
    NSDateFormatter *dateFormatter2 = [[NSDateFormatter alloc]init];
    dateFormatter2.dateFormat = format2;
    NSDate *currentDate = [dateFormatter2 dateFromString:currentTime];
    return [Utilities timeIntervalFromLastTime:lastDate ToCurrentTime:currentDate];
}
 
+ (NSString *)timeIntervalFromLastTime:(NSDate *)lastTime ToCurrentTime:(NSDate *)currentTime{
    NSTimeZone *timeZone = [NSTimeZone systemTimeZone];
    //上次時間
    NSDate *lastDate = [lastTime dateByAddingTimeInterval:[timeZone secondsFromGMTForDate:lastTime]];
    //當前時間
    NSDate *currentDate = [currentTime dateByAddingTimeInterval:[timeZone secondsFromGMTForDate:currentTime]];
    //時間間隔
    NSInteger intevalTime = [currentDate timeIntervalSinceReferenceDate] - [lastDate timeIntervalSinceReferenceDate];
 
    //秒、分、小時、天、月、年
    NSInteger minutes = intevalTime / 60;
    NSInteger hours = intevalTime / 60 / 60;
    NSInteger day = intevalTime / 60 / 60 / 24;
    NSInteger month = intevalTime / 60 / 60 / 24 / 30;
    NSInteger yers = intevalTime / 60 / 60 / 24 / 365;
 
    if (minutes <= 10) {
        return  @"剛剛";
    }else if (minutes < 60){
        return [NSString stringWithFormat: @"%ld分鐘前",(long)minutes];
    }else if (hours < 24){
        return [NSString stringWithFormat: @"%ld小時前",(long)hours];
    }else if (day < 30){
        return [NSString stringWithFormat: @"%ld天前",(long)day];
    }else if (month < 12){
        NSDateFormatter * df =[[NSDateFormatter alloc]init];
        df.dateFormat = @"M月d日";
        NSString * time = [df stringFromDate:lastDate];
        return time;
    }else if (yers >= 1){
        NSDateFormatter * df =[[NSDateFormatter alloc]init];
        df.dateFormat = @"yyyy年M月d日";
        NSString * time = [df stringFromDate:lastDate];
        return time;
    }
    return @"";
}

12. 對圖片進行濾鏡處理

#pragma mark - 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;
}

13. 對圖片進行模糊處理

#pragma mark - 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;
    }
}

14. 調整圖片飽和度、亮度、對比度

/**
 *  調整圖片飽和度, 亮度, 對比度
 *
 *  @param image      目標圖片
 *  @param saturation 飽和度
 *  @param brightness 亮度: -1.0 ~ 1.0
 *  @param contrast   對比度
 *
 */
+ (UIImage *)colorControlsWithOriginalImage:(UIImage *)image
                                 saturation:(CGFloat)saturation
                                 brightness:(CGFloat)brightness
                                   contrast:(CGFloat)contrast{
    CIContext *context = [CIContext contextWithOptions:nil];
    CIImage *inputImage = [[CIImage alloc] initWithImage:image];
    CIFilter *filter = [CIFilter filterWithName:@"CIColorControls"];
    [filter setValue:inputImage forKey:kCIInputImageKey];
 
    [filter setValue:@(saturation) forKey:@"inputSaturation"];
    [filter setValue:@(brightness) forKey:@"inputBrightness"];// 0.0 ~ 1.0
    [filter setValue:@(contrast) forKey:@"inputContrast"];
 
    CIImage *result = [filter valueForKey:kCIOutputImageKey];
    CGImageRef cgImage = [context createCGImage:result fromRect:[result extent]];
    UIImage *resultImage = [UIImage imageWithCGImage:cgImage];
    CGImageRelease(cgImage);
    return resultImage;
}

15. 建立一張實時模糊效果 View (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;
}

16. 全屏截圖

//全屏截圖
+ (UIImage *)shotScreen{
    UIWindow *window = [UIApplication sharedApplication].keyWindow;
    UIGraphicsBeginImageContext(window.bounds.size);
    [window.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

17. 截取一張 view 生成圖片

//截取view生成一張圖片
+ (UIImage *)shotWithView:(UIView *)view{
    UIGraphicsBeginImageContext(view.bounds.size);
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

18. 截取view中某個區域生成一張圖片

//截取view中某個區域生成一張圖片
+ (UIImage *)shotWithView:(UIView *)view scope:(CGRect)scope{
    CGImageRef imageRef = CGImageCreateWithImageInRect([self shotWithView:view].CGImage, scope);
    UIGraphicsBeginImageContext(scope.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGRect rect = CGRectMake(0, 0, scope.size.width, scope.size.height);
    CGContextTranslateCTM(context, 0, rect.size.height);//下移
    CGContextScaleCTM(context, 1.0f, -1.0f);//上翻
    CGContextDrawImage(context, rect, imageRef);
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    CGImageRelease(imageRef);
    CGContextRelease(context);
    return image;
}

19. 壓縮圖片到指定尺寸大小

//壓縮圖片到指定尺寸大小
+ (UIImage *)compressOriginalImage:(UIImage *)image toSize:(CGSize)size{
    UIImage *resultImage = image;
    UIGraphicsBeginImageContext(size);
    [resultImage drawInRect:CGRectMake(0, 0, size.width, size.height)];
    UIGraphicsEndImageContext();
    return resultImage;
}

26. 繪製虛線

/*   ** lineFrame:     虛線的 frame   ** length:        虛線中短線的寬度   ** spacing:       虛線中短線之間的間距   ** color:         虛線中短線的顏色 */ + (UIView *)createDashedLineWithFrame:(CGRect)lineFrame                            lineLength:(int)length                           lineSpacing:(int)spacing                             lineColor:(UIColor *)color{     UIView *dashedLine = [[UIView alloc] initWithFrame:lineFrame];     dashedLine.backgroundColor = [UIColor clearColor];     CAShapeLayer *shapeLayer = [CAShapeLayer layer];     [shapeLayer setBounds:dashedLine.bounds];     [shapeLayer setPosition:CGPointMake(CGRectGetWidth(dashedLine.frame) / 2, CGRectGetHeight(dashedLine.frame))];     [shapeLayer setFillColor:[UIColor clearColor].CGColor];     [shapeLayer setStrokeColor:color.CGColor];     [shapeLayer setLineWidth:CGRectGetHeight(dashedLine.frame)];     [shapeLayer setLineJoin:kCALineJoinRound];     [shapeLayer setLineDashPattern:[NSArray arrayWithObjects:[NSNumber numberWithInt:length], [NSNumber numberWithInt:spacing], nil]];     CGMutablePathRef path = CGPathCreateMutable();     CGPathMoveToPoint(path, NULL, 0, 0);     CGPathAddLineToPoint(path, NULL, CGRectGetWidth(dashedLine.frame), 0);     [shapeLayer setPath:path];     CGPathRelease(path);     [dashedLine.layer addSublayer:shapeLayer];     return dashedLine; }