IOS图片压缩上传服务器最终解决方案

IOS图片压缩上传服务器终极解决方案

我最终才去的方案如下：

/**
 *  动态发布图片压缩
 *
 *  @param source_image 原图image
 *  @param maxSize      限定的图片大小
 *
 *  @return 返回处理后的图片
 */
- (NSData *)resetSizeOfImageData:(UIImage *)source_image maxSize:(NSInteger)maxSize;

先调整分辨率，分辨率可以自己设定一个值，大于的就缩小到这分辨率，小余的就保持原本分辨率。然后在判断图片数据大小，传入范围maxSize = 100 ，大于的再压缩，小的就保持原样

- (NSData *)resetSizeOfImageData:(UIImage *)source_image maxSize:(NSInteger)maxSize
{
    //先调整分辨率
    CGSize newSize = CGSizeMake(source_image.size.width, source_image.size.height);

    CGFloat tempHeight = newSize.height / 1024;
    CGFloat tempWidth = newSize.width / 1024;

    if (tempWidth > 1.0 && tempWidth > tempHeight) {
        newSize = CGSizeMake(source_image.size.width / tempWidth, source_image.size.height / tempWidth);
    }
    else if (tempHeight > 1.0 && tempWidth < tempHeight){
        newSize = CGSizeMake(source_image.size.width / tempHeight, source_image.size.height / tempHeight);
    }
    
    UIGraphicsBeginImageContext(newSize);
    [source_image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    //调整大小
    NSData *imageData = UIImageJPEGRepresentation(newImage,1.0);
    NSUInteger sizeOrigin = [imageData length];
    NSUInteger sizeOriginKB = sizeOrigin / 1024;
    if (sizeOriginKB > maxSize) {
        NSData *finallImageData = UIImageJPEGRepresentation(newImage,0.50);
        return finallImageData;
    }
    
    return imageData;
}