iOS 保存图片（UIImageWriteToSavedPhotosAlbum）

iOS 将图片保存到相册，调用的API：

UIImageWriteToSavedPhotosAlbum(UIImage *image, id completionTarget, SEL completionSelector, void *contextInfo)

 

示例：
UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);

图片保存成功或失败后的处理

- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error
  contextInfo:(void *)contextInfo {
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil
                                                    message:@"保存图片成功"
                                                   delegate:nil
                                          cancelButtonTitle:NSLocalizedString(@"CO_ALERT_OK", nil)
                                          otherButtonTitles:nil, nil];
    if (error != nil) {
        alert.message = @"保存图片失败";
    }
    [alert show];
    [alert release];
}

 

遇到的问题:

曾经试过用：UIImageWriteToSavedPhotosAlbum(image, self, @selector(saveImageCompleted), nil); 去保存图片，原本想当图片保存成功或失败后，调用saveImageCompleted，结果直接崩溃。

- (void) saveImageCompleted {//图片保存后的处理

}

为什么会有这个error，目前没有弄明白