限制标签与图像动画混淆

如何解决限制标签与图像动画混淆

我的目标是通过让云彩从屏幕顶部开始然后向下动画来让气球看起来正在上升。我还有两个标签作为左上角的计时器，我想添加约束以确保它们留在那里。当标签上没有约束时，我下面的代码可以工作，但是一旦我添加了约束，云就不会使其低于计时器标签。我应该如何解决这个问题？我尝试将标签放在视图中，但是当我限制视图时，会出现同样的问题。

override func viewDidLoad() {
        super.viewDidLoad()
        
        Timer.scheduledTimer(timeInterval: 1.0,target: self,selector: 
            #selector(updateCounter),userInfo: nil,repeats: true)
        
        dispatchQueue.main.asyncAfter(deadline: .Now() + 0.5) {
            self.cloudOne.isHidden = false
            self.cloudTwo.isHidden = false
        }
        
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        moveIt(cloudOne,8,0.0)
        moveIt(cloudTwo,2.0)
    }

func moveIt(_ imageView: UIImageView,_ speed:CGFloat,_ delay:Double) {
        let speeds = speed
        let delays = delay
        let imageSpeed = speeds / view.frame.size.height
        let averageSpeed = (view.frame.size.height - imageView.frame.origin.y) * imageSpeed
        imageView.frame.origin.y = -100
        UIView.animate(withDuration: TimeInterval(averageSpeed),delay: delays,options: .curveLinear,animations: {
        imageView.frame.origin.y = self.view.frame.size.height
        },completion: { (_) in
            imageView.frame.origin.y = -imageView.frame.height
            self.moveIt(imageView,speeds,delay)
        })
    }