UIGestureReconizer 崩溃 - 无法识别的手势错误

Question

您好，当我使用 GestureReconizers 时，我的应用程序崩溃了。我收到一条错误消息，说它收到了无法识别的手势，我也收到了 SIGABRT 错误消息。我试过查看其他帖子，但还没有修复。 [顺便说一句，这是在我的 didMoveToView 部分]

var upSwipe = UISwipeGestureRecognizer(target: self, action: Selector("handleSwipes;"))
var downSwipe = UISwipeGestureRecognizer(target: self, action:     Selector("handleSwipes;"))
var rightSwipe = UISwipeGestureRecognizer(target: self, action: Selector("handleSwipes;"))
var leftSwipe = UISwipeGestureRecognizer(target: self, action: Selector("handleSwipes;"))

    upSwipe.direction = .Up
    downSwipe.direction = .Down
    rightSwipe.direction = .Right
    leftSwipe.direction = .Left

    view.addGestureRecognizer(upSwipe)
    view.addGestureRecognizer(downSwipe)
    view.addGestureRecognizer(leftSwipe)
    view.addGestureRecognizer(rightSwipe)

    func handleSwipes(sender: UISwipeGestureRecognizer) {
        if sender.direction == .Left {
            msgText("Left")
        }
        if sender.direction == .Right {
            msgText("Right")
        }
        if sender.direction == .Up {
            msgText("Up")
        }
        if sender.direction == .Down {
            msgText("Down")
        }

       }

我也在尝试让手势仅在 map.zPosition == 100 时激活。所以如果你知道一个好的方法，那就太棒了。

Answer 1

你不应该在选择器上使用分号，

这个"handleSwipes;"应该是"handleSwipes:"

Answer 2

您应该使用冒号“:”来处理 Swipes 而不是分号“;”

这就是您的代码崩溃的原因

Here is your fixed code

override func viewDidLoad() {
    super.viewDidLoad()

    var upSwipe = UISwipeGestureRecognizer(target: self, action: Selector("handleSwipes:"))
    var downSwipe = UISwipeGestureRecognizer(target: self, action: Selector("handleSwipes:"))
    var leftSwipe = UISwipeGestureRecognizer(target: self, action: Selector("handleSwipes:"))
    var rightSwipe = UISwipeGestureRecognizer(target: self, action: Selector("handleSwipes:"))

    leftSwipe.direction = .Left
    rightSwipe.direction = .Right
    upSwipe.direction = .Up
    downSwipe.direction = .Down

    view.addGestureRecognizer(leftSwipe)
    view.addGestureRecognizer(rightSwipe)
    view.addGestureRecognizer(upSwipe)
    view.addGestureRecognizer(downSwipe)

}
func handleSwipes(sender:UISwipeGestureRecognizer) {
    if (sender.direction == .Left) {
        print("Swipe Left")

    }

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

Output

UIGestureReconizer 崩溃 - 无法识别的手势错误

UIGestureReconizer Crash - Unrecognized Gesture Error

swift

sprite-kit

swipe