ios - 在 Swift 中每次点击都执行一些操作

Question

每次点击屏幕时，我都试图让一个正方形出现在 Swift 中的随机 CGPoint 上。下面是我所做的，没有编译器错误，但是一旦运行应用程序，我可以单击或拖动来移动我的“人”，但每次我这样做时，都不会出现更小的方 block 。任何建议或解决方案都很棒。谢谢你!顺便说一句，UIImageView 不是图像，但有一个可行的背景颜色。`

`

    @IBOutlet weak var person: UIImageView!

    var location = CGPoint(x: 0,y: 0)

    var randomPoint = CGPoint(x:Int(arc4random()%1000),y:Int(arc4random()%1000))

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

        let touch = touches.first

        location = touch!.locationInView(self.view)

        person.center = location

        for _ in touches {

            let mySquare: UIView = UIView(frame: CGRect(x: 0,y: 0,width: 20,height: 20))

            mySquare.backgroundColor = UIColor.cyanColor()

            mySquare.center = randomPoint

        }

    }

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

        let touch = touches.first

        location = touch!.locationInView(self.view)

        person.center = location

        for _ in touches {

            let mySquare: UIView = UIView(frame: CGRect(x: 0,y: 0,width: 20,height: 20))

            mySquare.backgroundColor = UIColor.cyanColor()

            mySquare.center = randomPoint

        }
    }`

Answer 1

对于每次触摸，您只需要在触摸开始(或触摸结束)中创建并添加(您错过了这一步)方 block ，而不是在触摸移动中进行操作。

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

        let touch = touches.first

        location = touch!.locationInView(self.view)

        person.center = location

        for _ in touches {

            let mySquare: UIView = UIView(frame: CGRect(x: 0,y: 0,width: 20,height: 20))

            mySquare.backgroundColor = UIColor.cyanColor()

            mySquare.center = randomPoint

            view.addSubview(mySquare) // add square to the view

        }

    }