使用滑块更改NSLAYOUT约束图像视图的宽度和高度

import UIKit

class ViewController: UIViewController {
    @IBOutlet weak var imageView: UIImageView!
    @IBOutlet weak var widthConstraint: NSLayoutConstraint!
    @IBOutlet weak var heightConstraint: NSLayoutConstraint!
    @IBOutlet weak var slider: UISlider!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // 设置滑块的最小值和最大值
        slider.minimumValue = 0.0
        slider.maximumValue = 1.0
        // 监听滑块数值变化事件
        slider.addTarget(self, action: #selector(sliderValueChanged), for: .valueChanged)
    }
    
    @objc func sliderValueChanged() {
        // 获取滑块的当前值
        let value = CGFloat(slider.value)
        // 根据滑块的值计算图像视图的新宽度和高度
        let newWidth = view.bounds.width * value
        let newHeight = view.bounds.height * value
        // 更新NSLayoutConstraint的constant属性
        widthConstraint.constant = newWidth
        heightConstraint.constant = newHeight
        // 使用动画更新布局
        UIView.animate(withDuration: 0.3) {
            self.view.layoutIfNeeded()
        }
    }
}