ios - UITapGestureRecognizer 不适用于 UIImageView

Question

可能之前有人回答过，但是我找不到了。我正在创建随机 UIImageView 实例并将它们作为 subview 添加到 viewController 的 View 中。

我以同样的方式创建 UITapGestureRecognizer 实例并将它们添加到 UIImageView 实例。但是 Tap 不起作用。

for _ in 0..<20 {
        let iv = UIImageView()
        iv.isUserInteractionEnabled = true
        iv.frame.origin = CGPoint(x: randomXGenerator(), y: randomYGenerator())
        iv.frame.size.width = randomGenerator()
        iv.frame.size.height = iv.frame.width
        iv.tintColor = UIColor.random() //To color the image inside the imageView
        iv.image = bubble
        view.addSubview(iv)
        animateBubblesRandom(bubble: iv)
        let tap = UITapGestureRecognizer(target: self, action: #selector(tappedOnBubble(object:)))
        iv.addGestureRecognizer(tap)
    }

下面是创建的 TapGesture 实例:

<UITapGestureRecognizer: 0x6000012b5b00; state = Possible; view = <UIImageView 0x7fdf4e507660>; target= <(action=tappedOnBubbleWithObject:, target=<FloatingBubbles.ViewController 0x7fdf4e605440>)>>
<UITapGestureRecognizer: 0x6000012bed00; state = Possible; view = <UIImageView 0x7fdf4e70b0b0>; target= <(action=tappedOnBubbleWithObject:, target=<FloatingBubbles.ViewController 0x7fdf4e605440>)>>
<UITapGestureRecognizer: 0x6000012bf000; state = Possible; view = <UIImageView 0x7fdf4e6041f0>; target= <(action=tappedOnBubbleWithObject:, target=<FloatingBubbles.ViewController 0x7fdf4e605440>)>>
<UITapGestureRecognizer: 0x6000012bf100; state = Possible; view = <UIImageView 0x7fdf4e605fa0>; target= <(action=tappedOnBubbleWithObject:, target=<FloatingBubbles.ViewController 0x7fdf4e605440>)>>
<UITapGestureRecognizer: 0x6000012bf200; state = Possible; view = <UIImageView 0x7fdf4e6079c0>; target= <(action=tappedOnBubbleWithObject:, target=<FloatingBubbles.ViewController 0x7fdf4e605440>)>>
<UITapGestureRecognizer: 0x6000012bf300; state = Possible; view = <UIImageView 0x7fdf4e607d20>; target= <(action=tappedOnBubbleWithObject:, target=<FloatingBubbles.ViewController 0x7fdf4e605440>)>>
<UITapGestureRecognizer: 0x6000012bf500; state = Possible; view = <UIImageView 0x7fdf4e608080>; target= <(action=tappedOnBubbleWithObject:, target=<FloatingBubbles.ViewController 0x7fdf4e605440>)>>
<UITapGestureRecognizer: 0x6000012bf600; state = Possible; view = <UIImageView 0x7fdf4e6083e0>; target= <(action=tappedOnBubbleWithObject:, target=<FloatingBubbles.ViewController 0x7fdf4e605440>)>>
<UITapGestureRecognizer: 0x6000012bf700; state = Possible; view = <UIImageView 0x7fdf4e414520>; target= <(action=tappedOnBubbleWithObject:, target=<FloatingBubbles.ViewController 0x7fdf4e605440>)>>
<UITapGestureRecognizer: 0x6000012b5f00; state = Possible; view = <UIImageView 0x7fdf4e414750>; target= <(action=tappedOnBubbleWithObject:, target=<FloatingBubbles.ViewController 0x7fdf4e605440>)>>
<UITapGestureRecognizer: 0x6000012b6000; state = Possible; view = <UIImageView 0x7fdf4e70b2e0>; target= <(action=tappedOnBubbleWithObject:, target=<FloatingBubbles.ViewController 0x7fdf4e605440>)>>
<UITapGestureRecognizer: 0x6000012bef00; state = Possible; view = <UIImageView 0x7fdf4e608b40>; target= <(action=tappedOnBubbleWithObject:, target=<FloatingBubbles.ViewController 0x7fdf4e605440>)>>
<UITapGestureRecognizer: 0x6000012bee00; state = Possible; view = <UIImageView 0x7fdf4e608ea0>; target= <(action=tappedOnBubbleWithObject:, target=<FloatingBubbles.ViewController 0x7fdf4e605440>)>>
<UITapGestureRecognizer: 0x6000012bf800; state = Possible; view = <UIImageView 0x7fdf4e609200>; target= <(action=tappedOnBubbleWithObject:, target=<FloatingBubbles.ViewController 0x7fdf4e605440>)>>
<UITapGestureRecognizer: 0x6000012bf900; state = Possible; view = <UIImageView 0x7fdf4e6096b0>; target= <(action=tappedOnBubbleWithObject:, target=<FloatingBubbles.ViewController 0x7fdf4e605440>)>>
<UITapGestureRecognizer: 0x6000012bfa00; state = Possible; view = <UIImageView 0x7fdf4e609a10>; target= <(action=tappedOnBubbleWithObject:, target=<FloatingBubbles.ViewController 0x7fdf4e605440>)>>
<UITapGestureRecognizer: 0x6000012bfb00; state = Possible; view = <UIImageView 0x7fdf4e609d70>; target= <(action=tappedOnBubbleWithObject:, target=<FloatingBubbles.ViewController 0x7fdf4e605440>)>>
<UITapGestureRecognizer: 0x6000012bfc00; state = Possible; view = <UIImageView 0x7fdf4e60a0d0>; target= <(action=tappedOnBubbleWithObject:, target=<FloatingBubbles.ViewController 0x7fdf4e605440>)>>
<UITapGestureRecognizer: 0x6000012bf400; state = Possible; view = <UIImageView 0x7fdf4e60a630>; target= <(action=tappedOnBubbleWithObject:, target=<FloatingBubbles.ViewController 0x7fdf4e605440>)>>
<UITapGestureRecognizer: 0x6000012bfd00; state = Possible; view = <UIImageView 0x7fdf4e60a990>; target= <(action=tappedOnBubbleWithObject:, target=<FloatingBubbles.ViewController 0x7fdf4e605440>)>>

我不明白为什么会这样。请帮忙!

Answer 1

• 除非您将其 isUserInteractionEnabled 设置为 true，否则无法触摸 UIImageView。

• 除非使用 .allowUserInteraction 动画选项，否则无法触摸动画 View 。

此外，您必须子类化并实现特殊的点击测试(因为动画 View 实际上可能并不位于用户看到它并尝试点击的地方):

override func hitTest(_ point: CGPoint, with e: UIEvent?) -> UIView? {
    let pres = self.layer.presentation()!
    let suppt = self.convert(point, to: self.superview!)
    let prespt = self.superview!.layer.convert(suppt, to: pres)
    return super.hitTest(prespt, with: e)
}