Ios 自定义按钮在导入后未显示在我的viewController中

我正在尝试创建一个自定义按钮并在viewController中导入，以减少其中的代码。然而，它不起作用。有人能给我一些提示吗

尽管ButtonView类已正确实例化，但按钮未显示

按钮查看快捷键

    import UIKit

final class ButtonView: UIButton {

    // MARK: - Init
    override init(frame: CGRect) {
        super.init(frame: frame)
        setupLayout()
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    // MARK: - Private functions
    private func setupLayout() {
        setTitle("Log In", for: .normal)
        titleLabel?.font = UIFont.boldSystemFont(ofSize: 18)
        setTitleColor(.white, for: .normal)
        backgroundColor = UIColor(red: 94/255, green: 162/255, blue: 58/255, alpha: 1)
        layer.cornerRadius = 10
        translatesAutoresizingMaskIntoConstraints = false
    }
}

class HomeController: UIViewController {

    //MARK: - Properties
    var delegate: ViewControllerDelegate?

    //MARK: - Views
    private let button = ButtonView()

    //MARK: - Lifecycle
    override func viewDidLoad() {
        super.viewDidLoad()

        setupLayout()
        configureNavigationBar()
    }

    fileprivate func setupLayout() {
        view.backgroundColor = .white

        view.addSubview(button)

        button.heightAnchor.constraint(equalToConstant: 50).isActive = true
        button.widthAnchor.constraint(equalToConstant: 150).isActive = true
        button.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        button.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 100).isActive = false

}
...

HomeController.swift

    import UIKit

final class ButtonView: UIButton {

    // MARK: - Init
    override init(frame: CGRect) {
        super.init(frame: frame)
        setupLayout()
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    // MARK: - Private functions
    private func setupLayout() {
        setTitle("Log In", for: .normal)
        titleLabel?.font = UIFont.boldSystemFont(ofSize: 18)
        setTitleColor(.white, for: .normal)
        backgroundColor = UIColor(red: 94/255, green: 162/255, blue: 58/255, alpha: 1)
        layer.cornerRadius = 10
        translatesAutoresizingMaskIntoConstraints = false
    }
}

class HomeController: UIViewController {

    //MARK: - Properties
    var delegate: ViewControllerDelegate?

    //MARK: - Views
    private let button = ButtonView()

    //MARK: - Lifecycle
    override func viewDidLoad() {
        super.viewDidLoad()

        setupLayout()
        configureNavigationBar()
    }

    fileprivate func setupLayout() {
        view.backgroundColor = .white

        view.addSubview(button)

        button.heightAnchor.constraint(equalToConstant: 50).isActive = true
        button.widthAnchor.constraint(equalToConstant: 150).isActive = true
        button.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        button.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 100).isActive = false

}
...

---

垂直放置按钮的约束未激活，请将其更改为

true

：

button.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 100).isActive = true

---

这个代码看起来不错。你需要检查你如何显示

HomeController

是否正确。

button.topAnchor.constraint（equalTo:view.safeAreaLayoutGuide.topAnchor，常量：100）。isActive=false

为什么它是false？按钮约束不正确哦，我在iPhone 8 plus上试用过。真丢脸哈哈哈