UICollectionView Objective-c的長按輕擊手勢識別器

Question

我在ViewController中使用UICollectionView來顯示圖像，我希望該用戶在長按時應能夠刪除照片，但是我無法檢測到長按手勢。 我已經閱讀了所有先前的討論，並試圖在我的項目中實施它們，但是沒有一個對我有用。

Answer 1

通過下面的行為您的imageview啟用用戶交互

imgview.userInteractionEnabled =YES;

//這里是示例代碼

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)
    {

    }

}