UITableView 스크롤에서 UIImageView 콘텐츠 (이미지)를 축소하는 방법은 무엇입니까?

트릭은 imageView의 프레임을 엉망으로 만들고 콘텐츠 모드가 변경되는 것처럼 보이게 만드는 것입니다. 프레임이나 제약 조건을 조작하여 다른 뷰 내에서 마스킹 할 수 있습니다. 예제를 실행하고 알려주세요.

import UIKit

class ViewController: UIViewController {

    var imageView = UIImageView()
    var maskView = UIView()
    var frame : CGRect = .zero

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        view.layoutIfNeeded()
        imageView = UIImageView(frame: CGRect(x: 20, y: 40, width: view.bounds.width-40, height: view.bounds.height/2))
        imageView.image = UIImage(named: "img")
        imageView.contentMode = .scaleAspectFill


        maskView = UIView(frame: CGRect(x: 20, y: 40, width: view.bounds.width-40, height: view.bounds.height/2))
        maskView.addSubview(imageView)
        maskView.layer.masksToBounds = true
        maskView.layer.cornerRadius = 6
        self.view.addSubview(maskView)

        //manipulate the imageView to make the content mode seem to change
        // and have it redraw itself
        frame = imageView.frame
        var newFrame = frame
        newFrame.size.height += newFrame.height
        imageView.frame = newFrame
        imageView.center = maskView.center


        let button = UIButton(frame: CGRect(x: 20, y: maskView.frame.maxY + 60, width: view.bounds.width - 40, height: 40))
        button.setTitle("Animate", for: .normal)
        button.setTitleColor(.blue, for: .normal)
        button.addTarget(self, action: #selector(ViewController.pressed), for: .touchUpInside)
        self.view.addSubview(button)


        let AnotherButton = UIButton(frame: CGRect(x: 20, y: button.frame.maxY + 20, width: view.bounds.width - 40, height: 40))
        AnotherButton.setTitle("Reset", for: .normal)
        AnotherButton.setTitleColor(.blue, for: .normal)
        AnotherButton.addTarget(self, action: #selector(ViewController.reset), for: .touchUpInside)
        self.view.addSubview(AnotherButton)
    }

    func pressed() {
        //animate
        // screw around with the imageView back to the original frame
        // you could also do this with the height constraints if it was constraint based
        UIView.animate(withDuration: 1.0, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1.0, options: .curveEaseOut, animations: {
            self.imageView.frame = self.maskView.bounds
        }, completion: nil)

    }

    func reset() {
        //reset big frame
        var newFrame = frame
        newFrame.size.height += newFrame.height

        UIView.animate(withDuration: 1.0, delay: 0, usingSpringWithDamping: 1.0, initialSpringVelocity: 1.0, options: .curveEaseOut, animations: {
            self.imageView.frame = newFrame
            self.imageView.center = self.maskView.center
        }, completion: nil)

    }

}

결과: