压缩图片

- (NSData *)reSizeImageData:(UIImage *)sourceImage maxImageSize:(CGFloat)maxImageSize maxSizeWithKB:(CGFloat) maxSize{
    
    if (maxSize <= 0.0) maxSize = 1024.0;
    if (maxImageSize <= 0.0) maxImageSize = 1024.0;
    
    //先调整分辨率
    CGSize newSize = CGSizeMake(sourceImage.size.width, sourceImage.size.height);
    
    CGFloat tempHeight = newSize.height / maxImageSize;
    CGFloat tempWidth = newSize.width / maxImageSize;
    
    if (tempWidth > 1.0 && tempWidth > tempHeight) {
        newSize = CGSizeMake(sourceImage.size.width / tempWidth, sourceImage.size.height / tempWidth);
    }
    else if (tempHeight > 1.0){
        newSize = CGSizeMake(sourceImage.size.width / tempHeight, sourceImage.size.height / tempHeight);
    }
    
    UIGraphicsBeginImageContext(newSize);
    [sourceImage drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    //调整大小
    NSData *imageData = UIImageJPEGRepresentation(newImage,1.0);
    CGFloat sizeOriginKB = imageData.length / 1024.0;
    
    CGFloat resizeRate = 0.9;
    while (sizeOriginKB > maxSize && resizeRate > 0.1) {
        imageData = UIImageJPEGRepresentation(newImage,resizeRate);
        sizeOriginKB = imageData.length / 1024.0;
        resizeRate -= 0.1;
    }
    
    return imageData;
}