Question

我在导航栏上使用大标题，当我点击一个单元格以转到下一个控制器时，大标题具有奇怪的动画（如下面的gif所示）。它不会立即消失。

我尝试了以下解决方案，但没有采取任何措施（https://www.morningswiftui.com/blog/fix-large-title-animation-on-ios13）

我的代码：

在第一个View Controller上：

override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)

        navigationItem.title = "New Order"
        navigationController?.navigationBar.prefersLargeTitles = true
}

在第二个视图控制器上（带有大标题）：

override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)

        navigationItem.title = "Menu"
        self.navigationController?.navigationBar.prefersLargeTitles = false
}

编辑：

Fabio的答案是解决方案，但现在我还有另一个问题：

当我点击一个单元格时，导航栏的一部分是黑色的（如下图所示）

Answer 1

尝试在第一个View Controller上插入：

 override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

    navigationItem.title = "New Order"
    navigationController?.navigationBar.prefersLargeTitles = true
    navigationItem.largeTitleDisplayMode =  .always
 }

并在Second View Controller上：

 override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

    navigationItem.title = "Menu"
    navigationItem.largeTitleDisplayMode = .never
}

Answer 2

将此扩展程序复制到设置导航栏：

extension UIViewController {
func configureNavigationBar(largeTitleColor: UIColor, backgoundColor: UIColor, tintColor: UIColor, title: String, preferredLargeTitle: Bool) {
if #available(iOS 13.0, *) {
    let navBarAppearance = UINavigationBarAppearance()
    navBarAppearance.configureWithOpaqueBackground()
    navBarAppearance.largeTitleTextAttributes = [.foregroundColor: largeTitleColor]
    navBarAppearance.titleTextAttributes = [.foregroundColor: largeTitleColor]
    navBarAppearance.backgroundColor = backgoundColor
    navigationController?.navigationBar.standardAppearance = navBarAppearance
    navigationController?.navigationBar.compactAppearance = navBarAppearance
    navigationController?.navigationBar.scrollEdgeAppearance = navBarAppearance

    navigationController?.navigationBar.prefersLargeTitles = preferredLargeTitle
    navigationController?.navigationBar.isTranslucent = false
    navigationController?.navigationBar.tintColor = tintColor
    navigationItem.title = title

} else {
    // Fallback on earlier versions
    navigationController?.navigationBar.barTintColor = backgoundColor
    navigationController?.navigationBar.tintColor = tintColor
    navigationController?.navigationBar.isTranslucent = false
    navigationItem.title = title
}}}

使用方法，请调用viewWillAppear

configureNavigationBar(largeTitleColor: .yourColor, backgoundColor: .yourColor, tintColor: .yourColor, title: "YourTitle", preferredLargeTitle: true)

现在在didSelectRow中使用pushVievController调用第二个控制器，如下所示：

let controller = YourViewController()
    navigationController?.pushViewController(controller, animated: true)

在第二个控制器的viewDidLoad中，将大标题设置为false，如下所示：

navigationItem.largeTitleDisplayMode = .never

如果要点亮内容，请在info.plist中将基于ViewController的状态栏设置为NO。如果您不希望largeTitles将其设置为false 在iOS 13上测试过，希望对您有所帮助:) 现在你可以了：）

Answer 3

第二期：在SceneDelegate中：var window: UIWindow? 在功能场景中放入以下行：

window?.backgroundColor = .yourColor

像这样：

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
    // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
    // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
    // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
    guard let _ = (scene as? UIWindowScene) else { return }
    window?.backgroundColor = .white
}

设置您想要的颜色就可以了：）

Answer 4

尝试在Second View Controller中使用viewDidLoad代替viewWillAppear

Answer 5

因此，您希望第一个视图控制器具有较大的标题，然后将以下代码添加到viewWillAppear(animated:)的第一个视图控制器中

self.navigationItem.largeTitleDisplayMode = .automatic
self.navigationController?.navigationBar.prefersLargeTitles = true

您想，您的下一个视图控制器标题不大，然后将以下代码添加到viewWillAppear(animated:)的下一个视图控制器中

self.navigationItem.largeTitleDisplayMode = .never

结论是，您只需要将self.navigationController?.navigationBar.prefersLargeTitles设置为true即可，只要您希望视图控制器需要在显示视图的开始处显示大标题

导航栏大标题-动画问题

5 个答案: