Question

每次点击屏幕时，我都试图在Swift中的随机CGPoint上出现一个正方形。下面是我没有编译错误的事情，但是一旦我运行应用程序，我可以点击或拖动来移动我的人，＆＃34;但每次我这样做，都不会出现较小的正方形。任何建议或解决方案都很棒。谢谢！顺便说一句，人，UIImageView是没有图像，但有一个可行的backgroundColor。

`

    @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

您没有将mySquare视图添加到任何视图中。

 self.view.addSubview(mySquare)

Answer 2

对于每次触摸，你只需要创建并添加（你错过了这一步）方形触摸开始（或触摸结束），不要触摸移动。

    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

        }

    }

在Swift中每次点击都做一些事情

2 个答案: