IOS 图片压缩保存

来源：互联网发布：sicp 知乎编辑：程序博客网时间：2024/05/23 13:40

创建一个UIImage+Category用于压缩图片处理/** *  @brief 压缩照片 *  @parma img:目标图片 *  @parma newSize:压缩至目标尺寸 */-(UIImage *)compressImageWithImage:(UIImage *)img scaleToSize:(CGSize)newsize{    UIGraphicsBeginImageContext(newsize);//    [img drawInRect:CGRectMake(0, 0,newsize.width, newsize.height)];    [img drawInRect:CGRectMake(0, 0,newsize.width + 1, newsize.height) blendMode:kCGBlendModeLuminosity alpha:1];    UIImage *resImge = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return resImge;}/** *  @brief 保存至相册 *  @parma newSize:压缩至目标尺寸 */-(void)saveImageToAlbumWithImage:(UIImage *)image{    UIImageWriteToSavedPhotosAlbum(image, nil, @selector(saveSuccess), nil);}

在需要压缩图片的地方使用：

//压缩图片- (UIImage *) saveImage:(UIImage *)currentImage{        NSData *imgaData = UIImageJPEGRepresentation(currentImage, 1);    if (imgaData == nil) {        return nil;    }    float imageSize = imgaData.length/1024.0;    if(imageSize < 300)    {        return currentImage;    }else{        //300为300k得到需要缩小的倍数关系传入宽高比进项压缩        CGFloat imgWidth = currentImage.size.width/sqrtf(imageSize/300);        CGFloat imgHeight = currentImage.size.height/sqrtf(imageSize/300);        UIImage *resImage = [currentImage compressImageWithImage:currentImage scaleToSize:CGSizeMake(imgWidth, imgHeight)];        return resImage;    }}

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