Question

我正在为圆子视图使用2种动画： 1.移动subView + = 50 pt。在按钮上单击（顶部，底部，左侧，右侧） 2.如果subView到达其superView的边界，则将subView返回到先前的位置（-= 50 pt）并更改其颜色。因此，我正努力将subView与superView的边界约束在一起。当subView的框架与superView的框架重合以及如何执行第二个Animation时，我不知道如何将其保存在superView中。

我是Swift的新手，不胜感激的解释;）

这就是我到目前为止得到的。

    @IBOutlet weak var viewForCircle: UIView! //superView
    @IBOutlet weak var upButton: UIButton!
    @IBOutlet weak var rightButton: UIButton!
    @IBOutlet weak var downButton: UIButton!
    @IBOutlet weak var leftButton: UIButton!

    //subView
    let circleView = UIView() 
    let coordinateX = 150
    let coordinateY = 150
    let width = 150
    let height = 150

    override func viewDidLoad() {
        super.viewDidLoad()

        //some buttons stuff is here


        self.circleView.frame = CGRect(x: coordinateX, y: coordinateY, width: width, height: height)
        self.circleView.backgroundColor = .purple
        self.circleView.layer.cornerRadius = circleView.frame.width / 2
        self.viewForCircle.addSubview(circleView)


   @IBAction func moveUp(_ sender: UIButton) {
        positionUp()
    }

   private func positionUp() {

   //the next line is what I'm struggling with

        if self.circleView.bounds.origin == self.viewForCircle.bounds.origin {
            UIView.animate(withDuration: 1, animations: {
                self.circleView.frame.origin.y += 50
                self.circleView.backgroundColor = .yellow
            })
        } else {
            UIView.animate(withDuration: 1, animations: {
                self.circleView.frame.origin.y -= 50
            })
        }
}

我可能还会弄错整个概念，这也可能是问题所在。如何使其运作？在此先感谢所有人！

Answer 1

您可以尝试

let movDis = self.view.frame.width - circleViewLeftMargin - self.circleView.frame.width

    if self.circleView.bounds.origin == self.viewForCircle.bounds.origin {
        UIView.animate(withDuration: 1, animations: {
            self.circleView.frame = self.circleView.frame.offsetBy(dx:movDis,dy:0)
            self.circleView.backgroundColor = .yellow
        })
    } else {
        UIView.animate(withDuration: 1, animations: {
           self.circleView.frame = self.circleView.frame.offsetBy(dx:-movDis,dy:0)
        })
    }

ios-将subView的动作动画化在其superView

1 个答案: