使用NSLayoutConstraints在UIView上实现简单的上滑式动画

import UIKit

class ViewController: UIViewController {
    
    let animatedView = UIView()
    let animator = UIViewPropertyAnimator(duration: 1.0, curve: .easeInOut) {
        self.animatedView.frame.origin.y -= 100
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置初始布局
        animatedView.backgroundColor = .blue
        animatedView.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(animatedView)
        
        NSLayoutConstraint.activate([
            animatedView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 20),
            animatedView.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -20),
            animatedView.heightAnchor.constraint(equalToConstant: 100),
            animatedView.centerYAnchor.constraint(equalTo: view.centerYAnchor)
        ])
        
        // 添加按钮触发动画
        let button = UIButton(type: .system)
        button.setTitle("Slide Up", for: .normal)
        button.addTarget(self, action: #selector(startAnimation), for: .touchUpInside)
        button.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(button)
        
        NSLayoutConstraint.activate([
            button.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            button.topAnchor.constraint(equalTo: animatedView.bottomAnchor, constant: 20)
        ])
    }
    
    @objc func startAnimation() {
        animator.startAnimation()
    }
}