限制UISwipeGestureRecognizer区域

Question

我使用了一些UISwipeGestureRecognizer作为菜单的选择器。因为我有不止一个，所以我需要有一个有限的滑动检测区域。这是我使用的代码：

 var rightSwipe = UISwipeGestureRecognizer(target: self, action: Selector("handleSwipe1"))

 rightSwipe.direction = .right

 view.addGestureRecognizer(rightSwipe)

我试过将它添加到UIImageView中，但它无法检测到触摸。

Answer 1

默认情况下，UIImage和UILabel的isUserInteractionEnabled为false。将其设置为true。

据我所知，你不能限制手势区域。但是你可以检查手势的位置，并决定如何处理它。

例如：

func addGesture() {
    let rightGesture = UISwipeGestureRecognizer(target: self, action: #selector(someAction(sender:)))
    rightGesture.direction = .right

    let leftGesture = UISwipeGestureRecognizer(target: self, action: #selector(someAction(sender:)))
    leftGesture.direction = .right

    view.addGestureRecognizer(rightGesture)
    view.addGestureRecognizer(leftGesture)
}

func someAction(sender: UISwipeGestureRecognizer) {
    let location = sender.location(in: view)
    if location.x > view.frame.width / 2 && sender.direction == .right {
        // do something
    } else if location.x < view.frame.width / 2 && sender.direction == .left {
        // do something else
    }
}

Answer 2

我只需要添加.isUserInteractionEnabled = true。下面是我的代码：

  var imageswipe = UIImageView()
  imageswipe.backgroundColor = UIColor.red
  imageswipe.frame = CGRect(x: 0, y: 0, width: self.size.width, height: self.size.height / 4)
  imageswipe.center = CGPoint(x: self.size.width / 2, y: self.size.height / 2)

  var rightSwipe = UISwipeGestureRecognizer(target: self, action: Selector("handleSwipes"))
  rightSwipe.direction = .right

  imageswipe.isUserInteractionEnabled = true
  imageswipe.addGestureRecognizer(rightSwipe)

  view.addSubview(imageswipe)