uinavigationcontroller的界面

Question

我在导航控制器下添加uiview时遇到问题。为什么我的uiview位于uinavigationcontroller的顶部，我想将uiview添加到navigationController下。这是我的代码。

let slideView = UIView()

view.backgroundColor = .white
        navigationItem.title = "Absensi"
        navigationController?.navigationBar.prefersLargeTitles = true
        navigationController?.navigationBar.barTintColor = .white
        navigationController?.navigationBar.shadowImage  = UIImage()
        navigationController?.navigationBar.largeTitleTextAttributes = [NSAttributedString.Key.font: UIFont(name: "NunitoSans-SemiBold", size: 20)]
        navigationItem.leftBarButtonItem = UIBarButtonItem(image: #imageLiteral(resourceName: "ic-back-line").withRenderingMode(.alwaysOriginal), style: .plain, target: self, action: #selector(handleBack))


view.addSubview(slideView)
        slideView.backgroundColor = .red
        slideView.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            slideView.topAnchor.constraint(equalTo: view.topAnchor),
            slideView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            slideView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
            slideView.heightAnchor.constraint(equalToConstant: 80)
        ])

Answer 1

仅尝试使用框架而不是约束。此代码应该起作用

  override func viewDidAppear(_ animated: Bool) {
        let slideView = UIView(frame: CGRect(x: 0, y:
            navigationController?.navigationBar.frame.height ?? 0 + 20 ,width: UIScreen.main.bounds.width, height: 80))

        slideView.backgroundColor = .red
        slideView.translatesAutoresizingMaskIntoConstraints = false

        view.backgroundColor = .white
        navigationItem.title = "Absensi"
        navigationController?.navigationBar.prefersLargeTitles = true
        navigationController?.navigationBar.barTintColor = .white
        navigationController?.navigationBar.shadowImage  = UIImage()
        navigationController?.navigationBar.largeTitleTextAttributes = [NSAttributedString.Key.font: UIFont(name: "NunitoSans-SemiBold", size: 20)]
        navigationItem.leftBarButtonItem = UIBarButtonItem(image: #imageLiteral(resourceName: "ic-back-line").withRenderingMode(.alwaysOriginal), style: .plain, target: self, action: #selector(handleBack))

        view.addSubview(slideView)            
  }

Answer 2

设置关于安全区域的约束。

Answer 3

您应该将topAnchor添加到安全区域-> view.safeAreaLayoutGuide.topAnchor

NSLayoutConstraint.activate([
    slideView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
    slideView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
    slideView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
    slideView.heightAnchor.constraint(equalToConstant: 80)
])

Answer 4

您需要将约束设置为安全区域。

let slideView = UIView()
view.addSubview(slideView)
slideView.backgroundColor = .red
slideView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
    slideView.safeAreaLayoutGuide.topAnchor.constraint(equalTo: view.topAnchor),
    slideView.safeAreaLayoutGuide.leadingAnchor.constraint(equalTo: view.leadingAnchor),
    slideView.safeAreaLayoutGuide.trailingAnchor.constraint(equalTo: view.trailingAnchor),
    slideView.safeAreaLayoutGuide.heightAnchor.constraint(equalToConstant: 80)
])