tapGesture沒有被執行

Question

我已經添加tapGesture到我的UIImageView rDot。問題是，當我點擊rDot時，什麼也沒有發生，並且它不打印「它工作」。 rDot與其他元素處於堆棧視圖，我不知道這是否與它無關。 rDot和redDot是兩個獨立的UIImageViews。

override func viewDidLoad() { 
    super.viewDidLoad() 

     rDot.isUserInteractionEnabled = true 
     let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(rdotimageTapped(tapGestureRecognizer:))) 
     rDot.addGestureRecognizer(tapGestureRecognizer)       
} 

func rdotimageTapped(tapGestureRecognizer: UITapGestureRecognizer) { 
     whiteD?.isHidden = true 
     redDot?.isHidden = false 
     print("It worked") 
    } 

Answer 1

您需要攜帶subView向前，因爲你已經把imageView內stackView。有時候，視圖層次結構不能識別分接subviews。

override func viewDidLoad() { 
    super.viewDidLoad() 

    rDot.isUserInteractionEnabled = true 
    let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(rdotimageTapped(tapGestureRecognizer:))) 
    rDot.addGestureRecognizer(tapGestureRecognizer) 
    view.bringSubview(toFront: rDot)     
}