ios - 如何排除 subview 的手势？

Question

我正在使用一个在 ImageView 中获取签名的应用程序。我使用 SWRevealViewController 作为侧面菜单。我的应用程序看起来像这样。

     class CaptureSignature: UIViewController,UIImagePickerControllerDelegate,UINavigationControllerDelegate,UIGestureRecognizerDelegate {

我正在编写下面的代码来显示侧面菜单

     override func viewDidLoad() {
            super.viewDidLoad()
    let revealViewController = self.revealViewController()
            menuBtn.addTarget(revealViewController, action: #selector(SWRevealViewController.rightRevealToggle(_:)), for: .touchUpInside)
            revealViewController?.panGestureRecognizer()?.isEnabled = true
    }

现在我的问题是，当我从右向左滑动 ImageView 时，侧边菜单打开，而不是画一条线。(因为我在 SWRevealViewController 中启用了 panGesture)。

我不想要的是，我不想在 imageView 上启用滑动手势以在向右滑动时显示菜单栏。我写了下面的函数，但它不起作用(即使当我在其中放置断点时它也没有进入方法)

       func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {


        if let touchedView = touch.view, touchedView.isDescendant(of: imageView) {
            print("touched in image view")
            return false
        }
        return false

    }

谁能帮帮我。

Answer 1

您可以使用以下方法忽略特定区域的滑动手势。

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool

您仍然可以调用touchesMoved来绘制您的签名。这是示例代码。

func addSwipeGesture() {
   let leftSwipe = UISwipeGestureRecognizer(target: self, action: 
      #selector(handleSwipes(_:)))
   leftSwipe.delegate = self
   let rightSwipe = UISwipeGestureRecognizer(target: self, action: 
      #selector(handleSwipes(_:)))
   rightSwipe.delegate = self

   leftSwipe.direction = .left
   rightSwipe.direction = .right

   self.view.addGestureRecognizer(leftSwipe)
   self.view.addGestureRecognizer(rightSwipe)
}

@objc func handleSwipes(_ sender:UISwipeGestureRecognizer) {

   if (sender.direction == .left) {
     print("Swipe Left")
   }

   if (sender.direction == .right) {
     print("Swipe Right")
   }
}

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive 
touch: UITouch) -> Bool {
   return !self.imgView.bounds.contains(touch.location(in: self.imgView))
}

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
   print("moving")
}

对于上面的代码片段， ImageView 的滑动将被忽略，即 imgView