图片压缩

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//图片大小缩放 + (UIImage *) scaleImage:(UIImage *)image toSize:(CGSize)size {     UIGraphicsBeginImageContext(size);          //size 为CGSize类型，即你所需要的图片尺寸     [image drawInRect:CGRectMake(0, 0, size.width, size.height)];     UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();     UIGraphicsEndImageContext();     return scaledImage;   //返回的就是已经改变的图片 }    //压缩图片,并返回成数据格式的 + (NSData *) zipImage:(UIImage *)img rate:(CGFloat)rate{     NSData *retImg = UIImageJPEGRepresentation(img, 0.5);     if (retImg==nil) {         retImg = UIImagePNGRepresentation(img);     }     return retImg; }