UILabel UILongPressGestureRecognizer不工作？

Question

如何在uilabel上获取UILongPressGestureRecognizer？当我实现下面的代码时，它不会调用该函数。所以请告诉我我做了什么错误？

UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]  initWithTarget:self action:@selector(LabelLongPressed:)]; 
longPress.minimumPressDuration = 0.5; // Seconds 
longPress.numberOfTapsRequired = 0; 

[objlblDuplicate addGestureRecognizer:longPress]; 
[longPress release]; 

Answer 1

默认情况下，UILabel无法获取触摸事件。

objlblDuplicate.userInteractionEnabled = YES;