Swift UIView.convert(_ point：to：)的意外行为

我正在try 转换一些视点中心，以便能够在这CGPoint之间划清界限.

然而，这些点完全垂直对齐，convert方法返回意外的值.显然，我确实遗漏了一些东西，也搞不清楚.我在此请求:)

我快速设置了这个代码，重现了这个问题:

class ViewController: UIViewController {
    
    private lazy var backgroundView: UIView = {
        let view = UIView()
        view.translatesAutoresizingMaskIntoConstraints = false
        view.backgroundColor = .systemBackground
        return view
    }()
    
    private lazy var firstView: UIView = {
        let view = UIView()
        view.translatesAutoresizingMaskIntoConstraints = false
        view.backgroundColor = .systemRed
        return view
    }()
    
    private lazy var secondView: UIView = {
        let view = UIView()
        view.translatesAutoresizingMaskIntoConstraints = false
        view.backgroundColor = .systemBlue
        return view
    }()
    
    private lazy var firstSubview: UIImageView = {
        let view = UIImageView()
        view.translatesAutoresizingMaskIntoConstraints = false
        view.backgroundColor = .systemMint
        return view
    }()
    
    private lazy var secondSubview: UIImageView = {
        let view = UIImageView()
        view.translatesAutoresizingMaskIntoConstraints = false
        view.backgroundColor = .systemGreen
        return view
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        
        view.addSubview(backgroundView)
        
        backgroundView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor).isActive = true
        backgroundView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor, constant: 20).isActive = true
        backgroundView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor, constant: -20).isActive = true
        backgroundView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor).isActive = true
        
        backgroundView.addSubview(firstView)
        backgroundView.addSubview(secondView)
        
        firstView.topAnchor.constraint(equalTo: backgroundView.topAnchor).isActive = true
        firstView.leadingAnchor.constraint(equalTo: backgroundView.leadingAnchor).isActive = true
        firstView.trailingAnchor.constraint(equalTo: backgroundView.trailingAnchor).isActive = true
        
        secondView.topAnchor.constraint(equalTo: firstView.bottomAnchor, constant: 10).isActive = true
        secondView.leadingAnchor.constraint(equalTo: backgroundView.leadingAnchor).isActive = true
        secondView.trailingAnchor.constraint(equalTo: backgroundView.trailingAnchor).isActive = true
        
        firstView.addSubview(firstSubview)
        
        firstSubview.topAnchor.constraint(equalTo: firstView.topAnchor).isActive = true
        firstSubview.bottomAnchor.constraint(equalTo: firstView.bottomAnchor).isActive = true
        firstSubview.leadingAnchor.constraint(equalTo: firstView.leadingAnchor).isActive = true
        firstSubview.heightAnchor.constraint(equalToConstant: 50).isActive = true
        firstSubview.widthAnchor.constraint(equalToConstant: 50).isActive = true
        
        secondView.addSubview(secondSubview)
        
        secondSubview.topAnchor.constraint(equalTo: secondView.topAnchor).isActive = true
        secondSubview.bottomAnchor.constraint(equalTo: secondView.bottomAnchor).isActive = true
        secondSubview.leadingAnchor.constraint(equalTo: secondView.leadingAnchor, constant: 10).isActive = true
        secondSubview.heightAnchor.constraint(equalToConstant: 30).isActive = true
        secondSubview.widthAnchor.constraint(equalToConstant: 30).isActive = true
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
                
        let firstCenter1 = firstSubview.convert(firstSubview.center, to: view)
        let secondCenter1 = secondSubview.convert(secondSubview.center, to: view)
        
        print(firstCenter1, secondCenter1)
    }
}

打印结果是(45.0, 84.0) (55.0, 134.0)，然而，正如我预期的那样，我应该打印出(45.0, 84.0) (45.0, 134.0).因为secondSubview的亲属center.x就是字面上的45.0和firstSubview.

我混合并匹配了S的参数和接球手，但没有运气.即使我得到center.x,center.y也给出了错误的值.

我错过了什么吗？