关于iOS开发中长按保存图片到相册

 我们在做一些有图片的项目中，经常需要添加用户长按保存图片的功能，本人自己整理了一些方法如下：

 // 长按保存图片

//  添加手势

        UILongPressGestureRecognizer *longP = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longP)];

        imageView.userInteractionEnabled = YES; // 打开交互

        [imageView addGestureRecognizer:longP];

- (void)longP{

    

    UIAlertController *con = [UIAlertController alertControllerWithTitle:@"提示" message:@"保存图片" preferredStyle:1];

    UIAlertAction *action = [UIAlertAction actionWithTitle:@"确定" style:0 handler:^(UIAlertAction * _Nonnull action) {

        UIImageWriteToSavedPhotosAlbum(view1.image,self,@selector(imageSavedToPhotosAlbum:didFinishSavingWithError:contextInfo:),NULL); // 写入相册

    }];

 //  此处的image1为对应image的imageView 请自行修改

    UIAlertAction *action1 = [UIAlertAction actionWithTitle:@"取消" style:0 handler:nil];

    

    [con addAction:action];

    [con addAction:action1];

    

    [self presentViewController:con animated:YES completion:nil];

   

}

// 完善回调

-(void)imageSavedToPhotosAlbum:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo

{

    if(!error){

        UIAlertController *con = [UIAlertController alertControllerWithTitle:@"提示" message:@"图片保存成功！" preferredStyle:1];

         UIAlertAction *action = [UIAlertAction actionWithTitle:@"确定" style:1 handler:nil];

        [con addAction:action];

        [self presentViewController:con animated:YES completion:nil];

       

        

    

    }else{

        NSLog(@"savefailed");

    }

}