用於UICollectionView的長按水龍頭手勢識別器Objective-c

Question

我在我的ViewController中使用UICollectionView來顯示圖像，我希望該用戶應該能夠長按刪除照片，但我無法檢測長按手勢。我已閱讀了以前的所有討論，並試圖在我的項目中實施它們，但它們都沒有爲我工作。

Answer 1

通過以下線啓用您的ImageView的用戶交互

imgview.userInteractionEnabled =YES; 

//下面是示例代碼

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) 
    { 

    } 

}