touchesEnded之后如何使用touchesBegan重新开始

Question

我的代码结果是在我已经画线之后，它将检测到正确或错误的位置并显示结果，但是在我已经画线之后，它将突然显示结果。我希望在绘制多于1条线后显示结果。我该怎么办？

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    super.touchesBegan(touches, with: event)
    let touch = touches.first
    swiped = false
    lastPoint = touch?.location(in: self)
    firstPoint = lastPoint
}


override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
    super.touchesMoved(touches, with: event)
    if let touch = touches.first {
        swiped = true
        currentPoint = touch.location(in: self)
        drawShapeLayer(from: lastPoint, to: currentPoint)
        lastPoint = currentPoint
    }
}

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
    super.touchesEnded(touches, with: event)
    if !swiped {
        drawShapeLayer(from: lastPoint, to: lastPoint!)
    }


    if  c1.contains(firstPoint) && c3.contains(linePoint) && c2.contains(lastPoint){
        AlertView.instance.showAlert(title: "Hooray!", message: "You made it!", alertType : .success)
    }

    else {
        AlertView.instance.showAlert(title: "Oops!", message: "You've almost got it.", alertType : .failure)
    }
}

Answer 1

首先，使用UISwipeGestureRecognizer可能会更容易https://developer.apple.com/documentation/uikit/uiswipegesturerecognizer

他们提取了很多东西，并简化了状态和路径之类的东西。

其中一些使我感到困惑

if !swiped {
    drawShapeLayer(from: lastPoint, to: lastPoint!)
}

不是那个

if !swiped {
    let touch = touches.first
    lastPoint = touch?.location(in: self)
    drawShapeLayer(from: firstPoint, to: lastPoint!)
}

也在此

  if  c1.contains(firstPoint) && c3.contains(linePoint) && c2.contains(lastPoint){
        AlertView.instance.showAlert(title: "Hooray!", message: "You made it!", alertType : .success)
    }

不会有linePoint！= lastPoint。

除非'drawShapeLayer'更改了这些，在这种情况下，您的数据封装有点混乱。