uiview over uinavigationcontroller答案

【问题标题】：uiview over uinavigationcontrolleruiview over uinavigationcontroller
【发布时间】：2020-06-17 17:27:13
【问题描述】：

在导航控制器下添加 uiview 时出现问题。为什么我的 uiview 在 uinavigationcontroller 之上，我想在 navigationController 下添加我的 uiview。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)
        ])

【问题讨论】：

尝试改变约束如下：slideView.safeAreaLayoutGuide.topAnchor.constraint(equalTo: view.topAnchor)
嘿，它工作，谢谢。我在想即使没有 safeArea @OnkarK，它也应该可以工作
view.sendSubviewToBack(slideView)
设置navigationController?.navigationBar.isTranslucent = false

标签： ios swift uiview uinavigationcontroller

【解决方案1】：

针对安全区域设置约束。

【讨论】：

【解决方案2】：

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)
])

【讨论】：

【解决方案3】：

尝试使用框架而不是约束..这段代码应该可以工作

  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)            
  }

【讨论】：