iOS 保存图片的回调方法

#pragma mark - 存图片到相册- (void)saveToPhotoLibrary:(UIButton *)sender{    [ToolsObject showLoadingMessage:@"正在保存到相册"];    sender.enabled = NO;    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum])    {        //得到正在展示的是哪一张图片        ZJCollectionViewCell *cell = self.ImageBrowsCollection.visibleCells[0];        UIImageWriteToSavedPhotosAlbum(cell.worksImageView.image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);    }}- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{    if (error)    {        ZJLog(@"保存图片失败信息：%@", error);        [ToolsObject showErrorMessage:@"保存失败"];    }    else    {        [ToolsObject showSuccessMessage:@"保存成功"];    }    _photoButton.enabled = YES;}