Swift游戏开发经典实例

输入

｜

87

3.1

侦测触摸

问题

我们如何知道用户触摸了某个视图？

解决方案

我们可以覆盖几个

UIView

的方法，这样当触摸开始、移动和结束时，这些方法将

得到调用。

在

View Controller

或

UIView

子类中加入以下代码：

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

for touch in touches {

NSLog("A touch began at \(touch.location(in: self.view))")

}

}

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

for touch in touches {

NSLog("A touch moved at \(touch.location(in: self.view))")

}

}

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

for touch in touches {

NSLog("A touch ended at \(touch.location(in: self.view))")

}

}

override func touchesCancelled(_ touches: ...