ios - UICollectionView Objective-c的长按点击手势识别器

Question

我在 ViewController 中使用 UICollectionView 来显示图像，我希望用户应该能够在长按时删除照片，但我无法检测到长按手势。我已经阅读了之前的所有讨论，并尝试在我的项目中实施它们，但没有一个对我有用。

Answer 1

通过以下行为您的 imageview 启用用户交互

imgview.userInteractionEnabled =YES;

//这里是示例代码

UILongPressGestureRecognizer *gestureRecognizer = [[UILongPressGestureRecognizer alloc] init];
[gestureRecognizer addTarget:self action:@selector(imgLongPressed:)];
gestureRecognizer.delegate = self;
imgview.userInteractionEnabled =YES;
[imgview addGestureRecognizer: gestureRecognizer];

- (void) imgLongPressed:(UILongPressGestureRecognizer*)sender
{
    UIImageView *view_ =(UIImageView*) sender.view;
    CGPoint point = [sender locationInView:view_.superview];

    if (sender.state == UIGestureRecognizerStateBegan)
    {

    }
    else if (sender.state == UIGestureRecognizerStateChanged)
    {

    }
    else if (sender.state == UIGestureRecognizerStateEnded)
    {

    }

}