IOS图片保存到本地相册

-(void)saveImage2<span style="font-family: Arial, Helvetica, sans-serif;">PhotosAlbum</span>
{
    UIImageWriteToSavedPhotosAlbum(_image.image, self, @selector(imageSavedToPhotosAlbum:didFinishSavingWithError:contextInfo:), nil);
}
- (void)imageSavedToPhotosAlbum:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
{
    NSString *message;
    if (!error) {
        message = @"成功保存到相册";
    }else
    {
        message = [error description];
    }
    NSLog(@"message is %@",message);
}