ios - 在快速触摸方法中滑动手势

Question

所以我已经在我的游戏中实现了手势识别器来检测我的玩家的移动，但发现它们没有给我想要的结果，所以我正在考虑在触摸方法和点击中制作滑动手势也在touches方法中。我已经设法使点击功能在 touches 方法中起作用，但我无法在 touches 方法中实现滑动功能，而且我似乎找不到有关如何执行此操作的教程。我下面的代码显示了我用来尝试实现此目的的触摸方法:

class GameScene: SKScene {

 var touchOrigin = CGPoint()
 var player = SKSpriteNode()


override func didMove(to view: SKView) {

    backgroundColor = .black

    player = SKSpriteNode(texture: nil, color: .orange, size: CGSize(width: 50, height: 50))
    player.position = CGPoint(x: 0, y: 0)
    addChild(player)

}

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {

}

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

}

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {

    for touch in touches {

        var currentTouchPosition = touch.location(in: self)
        touchOrigin = touch.location(in: self)

        if (Int(touchOrigin.x) > Int(currentTouchPosition.x)) {

            player.position.x -= 50

        } else if (Int(touchOrigin.x) < Int(currentTouchPosition.x)) {

            player.position.x += 50

        }

        if touch.tapCount == 1 {

            player.position.y += 50 //replace this with function :)

        } else if touch.tapCount >= 2 {

            player.position.y += 150 // change to run shield effect :)

        }
    }

}

override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {
}

}

如何让 touches 方法识别特定方向的滑动手势？如果他们朝一个方向滑动而不是将手指从屏幕上移开并在一个 Action 中滑动回到原点，我该如何做到这一点，然后将其识别为点击？

Answer 1

这是一个如何检测滑动手势的示例。

首先，定义实例变量来存储起始位置和时间

var start:(location:CGPoint, time:TimeInterval)?

并定义滑动手势的参数。相应地调整这些:

let minDistance:CGFloat = 25
let minSpeed:CGFloat = 1000
let maxSpeed:CGFloat = 6000

在touchesBegan中，保存每个新触摸事件的位置/时间

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    if let touch = touches.first {
        start = (touch.location(in:self), touch.timestamp)
    }
}

在 touchesEnded 中，通过比较手势的距离和速度来确定用户的手势是否为滑动。对角滑动的测试是可选的。

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
    var swiped = false
    if let touch = touches.first, let startTime = self.start?.time,
            let startLocation = self.start?.location {
        let location = touch.location(in:self)
        let dx = location.x - startLocation.x
        let dy = location.y - startLocation.y
        let distance = sqrt(dx*dx+dy*dy)

        // Check if the user's finger moved a minimum distance
        if distance > minDistance {
            let deltaTime = CGFloat(touch.timestamp - startTime)
            let speed = distance / deltaTime

            // Check if the speed was consistent with a swipe
            if speed >= minSpeed && speed <= maxSpeed {

                // Determine the direction of the swipe
                let x = abs(dx/distance) > 0.4 ? Int(sign(Float(dx))) : 0
                let y = abs(dy/distance) > 0.4 ? Int(sign(Float(dy))) : 0

                swiped = true
                switch (x,y) {
                case (0,1):
                    print("swiped up")
                case (0,-1):
                    print("swiped down")
                case (-1,0):
                    print("swiped left")
                case (1,0):
                    print("swiped right")
                case (1,1):
                    print("swiped diag up-right")
                case (-1,-1):
                    print("swiped diag down-left")
                case (-1,1):
                    print("swiped diag up-left")
                case (1,-1):
                    print("swiped diag down-right")
                default:
                    swiped = false
                    break
                }
            }
        }
    }
    start = nil
    if !swiped {
        // Process non-swipes (taps, etc.)
        print("not a swipe")
    }
}