图片压缩的一则代码

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iOS 压缩图片分辨率

+ (UIImage *)imageWithMaxSide:(CGFloat)length sourceImage:(UIImage *)image{    CGFloat scale = [[UIScreen mainScreen] scale];    CGSize imgSize = CWSizeReduce(image.size, length);    UIImage *img = nil;    UIGraphicsBeginImageContextWithOptions(imgSize, YES, scale);      // 创建一个 bitmap context    [image drawInRect:CGRectMake(0, 0, imgSize.width, imgSize.height)    blendMode:kCGBlendModeNormal     alpha:1.0];              // 将图片绘制到当前的 context 上    img = UIGraphicsGetImageFromCurrentImageContext();     // 从当前 context 中获取刚绘制的图片     UIGraphicsEndImageContext();    return img;}static inline // 按比例减少尺寸{    CGFloat max = MAX(size.width, size.height);    if (max < limit) {        return size;    }    CGSize imgSize;    CGFloat ratio = size.height / size.width;    if (size.width > size.height) {        imgSize = CGSizeMake(limit, limit*ratio);    } else {        imgSize = CGSizeMake(limit/ratio, limit);    }    return imgSize;}

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