ios - 如何快速修复动画？

Question

我有带有月亮图像的 UIImageView。
moonImageContainerView 是 UIImageView 的 superView
我向 moonImageContainerView 添加了滑动手势。

如果向上滑动，

self.titleLabel.isHidden = false

UIView.animate(withDuration: 0.3, delay: 0.0, options: .curveEaseIn, animations: {
    self.moonImageContainerView.transform = CGAffineTransform(scaleX: 0.5, y: 0.5)
    self.moonImageContainerView.center.y = self.view.center.y
}, completion: nil)

你可以用gif看到结果
https://imgur.com/a/ftShkpO

<小时/>

现在，如果我只添加 self.titleLabel.text = "MY TOPIA"
我的动画中断了。

self.titleLabel.text = "MY TOPIA" // Just added this line.
self.titleLabel.isHidden = false

UIView.animate(withDuration: 0.3, delay: 0.0, options: .curveEaseIn, animations: {
    self.moonImageContainerView.transform = CGAffineTransform(scaleX: 0.5, y: 0.5)
    self.moonImageContainerView.center.y = self.view.center.y
}, completion: nil)

可以用gif看到结果
https://imgur.com/a/y57fPlA

为什么moonImageContainerView会消失到底部？
我该如何修复它？

Answer 1

嗯，我使用其余设置，没有看到你的情况。

    import UIKit

    class ImageViewController: UIViewController {

        @IBOutlet  var moonImageContainerView: UIView!
        @IBOutlet  var titleLabel: UILabel!

        override func viewDidLoad() {
        super.viewDidLoad()

        let pan =  UISwipeGestureRecognizer.init(target: self, action: #selector(pp(_:)))
        pan.direction = .up
        moonImageContainerView.addGestureRecognizer(pan)

        }

        @objc func pp(_ pan: UISwipeGestureRecognizer){
        self.titleLabel.text = "MY TOPIA"
        self.titleLabel.isHidden = false

        UIView.animate(withDuration: 0.3, delay: 0.0, options: .curveEaseIn, animations: {
        self.moonImageContainerView.transform = CGAffineTransform(scaleX: 0.5, y: 0.5)
        self.moonImageContainerView.center.y = self.view.center.y
        }, completion: nil)
        }

    }