从我触摸屏的位置获取坐标

Question

我尝试从点击触摸屏的位置获取坐标，以在此时放置特定的UIImage。

我怎样才能做到这一点？

Answer 1

在UIResponder子类中，例如UIView：

override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
    let touch = touches.anyObject()! as UITouch
    let location = touch.locationInView(self)
}

这将返回一个CGPoint视图坐标。

使用Swift 3语法更新

override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
    let touch = touches.first!
    let location = touch.location(in: self)
}

使用Swift 4语法更新

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