iOS常用公共方法

1. 获取磁盘总空间大小
//磁盘总空间

+ (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. 获取磁盘可用空间大小
//磁盘可用空间

+ (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;

}
3. 获取指定路径下某个文件的大小
//获取文件大小

+ (long long)fileSizeAtPath:(NSString *)filePath{

    NSFileManager *fileManager = [NSFileManager defaultManager];

    if (![fileManager fileExistsAtPath:filePath]) return 0;

    return [[fileManager attributesOfItemAtPath:filePath error:nil] fileSize];

}
4. 获取文件夹下所有文件的大小
//获取文件夹下所有文件的大小

+ (long long)folderSizeAtPath:(NSString *)folderPath{

    NSFileManager *fileManager = [NSFileManager defaultManager];

    if (![fileManager fileExistsAtPath:folderPath]) return 0;

    NSEnumerator *filesEnumerator = [[fileManager subpathsAtPath:folderPath] objectEnumerator];

    NSString *fileName;

    long long folerSize = 0;

    while ((fileName = [filesEnumerator nextObject]) != nil) {

        NSString *filePath = [folderPath stringByAppendingPathComponent:fileName];

        folerSize += [self fileSizeAtPath:filePath];

    }

    return folerSize;

}
5. 将字符串数组按照元素首字母顺序进行排序分组
//将字符串数组按照元素首字母顺序进行排序分组

+ (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];

    //创建27个分组数组

    for (int i = 0; i < indexedCollation.sectionTitles.count; i++) {

        NSMutableArray *obj = [NSMutableArray array];

        [objects addObject:obj];

    }

    NSMutableArray *keys = [NSMutableArray arrayWithCapacity:objects.count];

    //按字母顺序进行分组

    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;

    }

    //去掉空数组

    for (int i = 0; i < objects.count; i++) {

        NSMutableArray *obj = objects[i];

        if (obj.count == 0) {

            [objects removeObject:obj];

        }

    }

    //获取索引字母

    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;

}

//获取字符串(或汉字)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];

}

使用如下:

NSArray *arr = @[@"guangzhou", @"shanghai", @"北京", @"henan", @"hainan"];

NSDictionary *dic = [Utilities dictionaryOrderByCharacterWithOriginalArray:arr];

NSLog(@"\n\ndic: %@", dic);
6. 获取当前时间
//获取当前时间

//format: @"yyyy-MM-dd HH:mm:ss"、@"yyyy年MM月dd日 HH时mm分ss秒"

+ (NSString *)currentDateWithFormat:(NSString *)format{

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

    [dateFormatter setDateFormat:format];

    return [dateFormatter stringFromDate:[NSDate date]];

}
7. 计算上次日期距离现在多久, 如 xx 小时前、xx 分钟前等
/**

 *  计算上次日期距离现在多久

 *

 *  @param lastTime    上次日期(需要和格式对应)

 *  @param format1     上次日期格式

 *  @param currentTime 最近日期(需要和格式对应)

 *  @param format2     最近日期格式

 *

 *  @return xx分钟前、xx小时前、xx天前

 */

+ (NSString *)timeIntervalFromLastTime:(NSString *)lastTime

                        lastTimeFormat:(NSString *)format1

                         ToCurrentTime:(NSString *)currentTime

                     currentTimeFormat:(NSString *)format2{

    //上次时间

    NSDateFormatter *dateFormatter1 = [[NSDateFormatter alloc]init];

    dateFormatter1.dateFormat = format1;

    NSDate *lastDate = [dateFormatter1 dateFromString:lastTime];

    //当前时间

    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];

    //上次时间

    NSDate *lastDate = [lastTime dateByAddingTimeInterval:[timeZone secondsFromGMTForDate:lastTime]];

    //当前时间

    NSDate *currentDate = [currentTime dateByAddingTimeInterval:[timeZone secondsFromGMTForDate:currentTime]];

    //时间间隔

    NSInteger intevalTime = [currentDate timeIntervalSinceReferenceDate] - [lastDate timeIntervalSinceReferenceDate];

    //秒、分、小时、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  @"刚刚";

    }else if (minutes < 60){

        return [NSString stringWithFormat: @"%ld分钟前",(long)minutes];

    }else if (hours < 24){

        return [NSString stringWithFormat: @"%ld小时前",(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 @"";

}

使用如下:

NSLog(@"\n\nresult: %@", [Utilities timeIntervalFromLastTime:@"2015年12月8日 15:50"

                                           lastTimeFormat:@"yyyy年MM月dd日 HH:mm"

                                            ToCurrentTime:@"2015/12/08 16:12"

                                        currentTimeFormat:@"yyyy/MM/dd HH:mm"]);
7. 获取当前时间
//获取当前时间

//format: @"yyyy-MM-dd HH:mm:ss"、@"yyyy年MM月dd日 HH时mm分ss秒"

+ (NSString *)currentDateWithFormat:(NSString *)format{

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

    [dateFormatter setDateFormat:format];

    return [dateFormatter stringFromDate:[NSDate date]];

}
8. 计算上次日期距离现在多久, 如 xx 小时前、xx 分钟前等
/**

 *  计算上次日期距离现在多久

 *

 *  @param lastTime    上次日期(需要和格式对应)

 *  @param format1     上次日期格式

 *  @param currentTime 最近日期(需要和格式对应)

 *  @param format2     最近日期格式

 *

 *  @return xx分钟前、xx小时前、xx天前

 */

+ (NSString *)timeIntervalFromLastTime:(NSString *)lastTime

                        lastTimeFormat:(NSString *)format1

                         ToCurrentTime:(NSString *)currentTime

                     currentTimeFormat:(NSString *)format2{

    //上次时间

    NSDateFormatter *dateFormatter1 = [[NSDateFormatter alloc]init];

    dateFormatter1.dateFormat = format1;

    NSDate *lastDate = [dateFormatter1 dateFromString:lastTime];

    //当前时间

    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];

    //上次时间

    NSDate *lastDate = [lastTime dateByAddingTimeInterval:[timeZone secondsFromGMTForDate:lastTime]];

    //当前时间

    NSDate *currentDate = [currentTime dateByAddingTimeInterval:[timeZone secondsFromGMTForDate:currentTime]];

    //时间间隔

    NSInteger intevalTime = [currentDate timeIntervalSinceReferenceDate] - [lastDate timeIntervalSinceReferenceDate];

    //秒、分、小时、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  @"刚刚";

    }else if (minutes < 60){

        return [NSString stringWithFormat: @"%ld分钟前",(long)minutes];

    }else if (hours < 24){

        return [NSString stringWithFormat: @"%ld小时前",(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 @"";

}

使用如下:

NSLog(@"\n\nresult: %@", [Utilities timeIntervalFromLastTime:@"2015年12月8日 15:50"

                                           lastTimeFormat:@"yyyy年MM月dd日 HH:mm"

                                            ToCurrentTime:@"2015/12/08 16:12"

                                        currentTimeFormat:@"yyyy/MM/dd HH:mm"]);
9. 判断手机号码格式是否正确
//判断手机号码格式是否正确

+ (BOOL)valiMobile:(NSString *)mobile{

    mobile = [mobile stringByReplacingOccurrencesOfString:@" " withString:@""];

    if (mobile.length != 11)

    {

        return NO;

    }else{

        /**

         * 移动号段正则表达式

         */

        NSString *CM_NUM = @"^((13[4-9])|(147)|(15[0-2,7-9])|(178)|(18[2-4,7-8]))\\d{8}|(1705)\\d{7}$";

        /**

         * 联通号段正则表达式

         */

        NSString *CU_NUM = @"^((13[0-2])|(145)|(15[5-6])|(176)|(18[5,6]))\\d{8}|(1709)\\d{7}$";

        /**

         * 电信号段正则表达式

         */

        NSString *CT_NUM = @"^((133)|(153)|(177)|(18[0,1,9]))\\d{8}$";

        NSPredicate *pred1 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM_NUM];

        BOOL isMatch1 = [pred1 evaluateWithObject:mobile];

        NSPredicate *pred2 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU_NUM];

        BOOL isMatch2 = [pred2 evaluateWithObject:mobile];

        NSPredicate *pred3 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT_NUM];

        BOOL isMatch3 = [pred3 evaluateWithObject:mobile];

        if (isMatch1 || isMatch2 || isMatch3) {

            return YES;

        }else{

            return NO;

        }

    }

}
10. 判断邮箱格式是否正确
//利用正则表达式验证

+ (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];

}
11. 将十六进制颜色转换为 UIColor 对象
//将十六进制颜色转换为 UIColor 对象

+ (UIColor *)colorWithHexString:(NSString *)color{

    NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];

    // String should be 6 or 8 characters

    if ([cString length] < 6) {

        return [UIColor clearColor];

    }

    // strip "0X" or "#" if it appears

    if ([cString hasPrefix:@"0X"])

        cString = [cString substringFromIndex:2];

    if ([cString hasPrefix:@"#"])

        cString = [cString substringFromIndex:1];

    if ([cString length] != 6)

        return [UIColor clearColor];

    // Separate into r, g, b substrings

    NSRange range;

    range.location = 0;

    range.length = 2;

    //r

    NSString *rString = [cString substringWithRange:range];

    //g

    range.location = 2;

    NSString *gString = [cString substringWithRange:range];

    //b

    range.location = 4;

    NSString *bString = [cString substringWithRange:range];

    // Scan values

    unsigned int r, g, b;

    [[NSScanner scannerWithString:rString] scanHexInt:&r];

    [[NSScanner scannerWithString:gString] scanHexInt:&g];

    [[NSScanner scannerWithString:bString] scanHexInt:&b];

    return [UIColor colorWithRed:((float) r / 255.0f) green:((float) g / 255.0f) blue:((float) b / 255.0f) alpha:1.0f];

}
12. 对图片进行滤镜处理
#pragma mark - 对图片进行滤镜处理

// 怀旧 --> CIPhotoEffectInstant                         单色 --> CIPhotoEffectMono

// 黑白 --> CIPhotoEffectNoir                            褪色 --> CIPhotoEffectFade

// 色调 --> CIPhotoEffectTonal                           冲印 --> CIPhotoEffectProcess

// 岁月 --> CIPhotoEffectTransfer                        铬黄 --> 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. 对图片进行模糊处理
#pragma mark - 对图片进行模糊处理

// CIGaussianBlur ---> 高斯模糊

// CIBoxBlur      ---> 均值模糊(Available in iOS 9.0 and later)

// CIDiscBlur     ---> 环形卷积模糊(Available in iOS 9.0 and later)

// CIMedianFilter ---> 中值模糊, 用于消除图像噪点, 无需设置radius(Available in iOS 9.0 and later)

// CIMotionBlur   ---> 运动模糊, 用于模拟相机移动拍摄时的扫尾效果(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. 调整图片饱和度、亮度、对比度
/**

 *  调整图片饱和度, 亮度, 对比度

 *

 *  @param image      目标图片

 *  @param saturation 饱和度

 *  @param brightness 亮度: -1.0 ~ 1.0

 *  @param contrast   对比度

 *

 */

+ (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"];

    [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. 创建一张实时模糊效果 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;

}
全屏截图
//全屏截图

+ (UIImage *)shotScreen{

    UIWindow *window = [UIApplication sharedApplication].keyWindow;

    UIGraphicsBeginImageContext(window.bounds.size);

    [window.layer renderInContext:UIGraphicsGetCurrentContext()];

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return image;

}
17. 截取一张 view 生成图片
//截取view生成一张图片

+ (UIImage *)shotWithView:(UIView *)view{

    UIGraphicsBeginImageContext(view.bounds.size);

    [view.layer renderInContext:UIGraphicsGetCurrentContext()];

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return image;

}
18. 截取view中某个区域生成一张图片
//截取view中某个区域生成一张图片

+ (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. 压缩图片到指定尺寸大小
//压缩图片到指定尺寸大小

+ (UIImage *)compressOriginalImage:(UIImage *)image toSize:(CGSize)size{

    UIImage *resultImage = image;

    UIGraphicsBeginImageContext(size);

    [resultImage drawInRect:CGRectMake(0, 0, size.width, size.height)];

    UIGraphicsEndImageContext();

    return resultImage;

}
20. 压缩图片到指定文件大小
//压缩图片到指定文件大小

+ (NSData *)compressOriginalImage:(UIImage *)image toMaxDataSizeKBytes:(CGFloat)size{

    NSData *data = UIImageJPEGRepresentation(image, 1.0);

    CGFloat dataKBytes = data.length/1000.0;

    CGFloat maxQuality = 0.9f;

    CGFloat lastData = dataKBytes;

    while (dataKBytes > size && maxQuality > 0.01f) {

        maxQuality = maxQuality - 0.01f;

        data = UIImageJPEGRepresentation(image, maxQuality);

        dataKBytes = data.length/1000.0;

        if (lastData == dataKBytes) {

            break;

        }else{

            lastData = dataKBytes;

        }

    }

    return data;

}
26. 绘制虚线
/*

  ** lineFrame:     虚线的 frame

  ** length:        虚线中短线的宽度

  ** spacing:       虚线中短线之间的间距

  ** color:         虚线中短线的颜色

*/

+ (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;

}
27. 将字典对象转换为 JSON 字符串
+ (NSString *)jsonPrettyStringEncoded:(NSDictionary *)dictionary{

    if ([NSJSONSerialization isValidJSONObject:dictionary ]) {

        NSError *error;

        NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dictionary options:NSJSONWritingPrettyPrinted error:&error];

        if (!error) {

            NSString *json = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];

            return json;

        }

    }

    return nil;

}
28.将数组对象转换为 JSON 字符串
+ (NSString *)jsonPrettyStringEncoded:(NSArray *)array{

    if ([NSJSONSerialization isValidJSONObject:array]) {

        NSError *error;

        NSData *jsonData = [NSJSONSerialization dataWithJSONObject:array options:NSJSONWritingPrettyPrinted error:&error];

        if (!error) {

            NSString *json = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];

            return json;

        }

    }

    return nil;

}

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