UIGestureRecognizer中的UILabel子類不會被調用

Question

我有UILabel一個子類，看起來像這樣：

class GestureLabel: UILabel { 

    override init(frame: CGRect) { 
     super.init(frame: frame) 
     initialize() 
    } 

    required init?(coder aDecoder: NSCoder) { 
     super.init(coder: aDecoder) 
     initialize() 
    } 

    func initialize() { 
     self.addGestureRecognizer(UILongPressGestureRecognizer(target: self, action: Selector("longPressGestureRecognizer:"))) 
    } 

    deinit { 
     gestureRecognizers?.removeAll() 
    } 

    func longPressGestureRecognizer(sender: AnyObject) {     
     print("this is never called") 
    } 
} 

但longPressGestureRecognizer永遠不會被調用。難道我做錯了什麼？

Answer 1

默認userInteractionEnabled在UILabels上被禁用，所以您必須在添加手勢識別器時手動啓用它。

確保您設置self.userInteractionEnabled = true