SwiftUI LandScape 导航顶栏不会隐藏答案

【问题标题】：SwifUI LandScape NavigationTopBar won't hideSwiftUI LandScape 导航顶栏不会隐藏
【发布时间】：2020-09-15 08:14:15
【问题描述】：

我想要所有视图之间只有一个横向视图，所以我在 AppDelegate 中添加了以下代码

func application(_ application: UIApplication, supportedInterfaceOrientationsFor window: 
UIWindow?) -> UIInterfaceOrientationMask {
    return AppDelegate.orientationLock
}

我创建了一个自定义修饰符，如下所示，以强制特定视图处于横向模式

    struct LandScapeOrientation: ViewModifier {
    
        func body(content: Content) -> some View {
            content
                .onAppear {
                    AppDelegate.orientationLock = UIInterfaceOrientationMask.landscapeLeft
                    UIDevice.current.setValue(UIInterfaceOrientation.landscapeLeft.rawValue, forKey: "orientation")
                    UINavigationController.attemptRotationToDeviceOrientation()
                 }
                .onDisappear {
                    DispatchQueue.main.async {
                    AppDelegate.orientationLock = UIInterfaceOrientationMask.portrait
                    UIDevice.current.setValue(UIInterfaceOrientation.portrait.rawValue, forKey: "orientation")
                    UINavigationController.attemptRotationToDeviceOrientation()
                }
            }
    }}

    extension View {
    func landScape() -> some View{
        self.modifier(LandScapeOrientation())
    }
}

我创建的视图如下所示：

struct GameplayScene: View {

//MARK: - Var
@State var round = NeverMindRound.first
@Binding var mode: NevermindMode
//MARK: - Views
private var background: some View {
    colors.customYellowOk.value
        .edgesIgnoringSafeArea(.all)
}
//MARK: - MainBody
var body: some View {
    
   return ZStack{
    
    background
        
    RoundIntro(round: $round)
            .landScape()
    .navigationBarHidden(true)
    .navigationBarBackButtonHidden(true)
    .statusBar(hidden: true)
    }.navigationBarHidden(true)
    .navigationBarBackButtonHidden(true)
    .statusBar(hidden: true)

}}

所以问题是在横向模式下显示此视图后，navigationBar 将显示，即使我指定它应该隐藏，我也无法隐藏它..

这是 GamePlay 呈现的 rounIntro 视图

      struct RoundIntro: View {
    
    
    //MARK: - Vars
    @Binding var round: NeverMindRound
   
    
    //MARK: - View
    private var roundTitle: some View {
        var shadow     = colors.round1TitleShadow.value
        var roundTitle = "Round 1"
        switch round {
            case .first:
                roundTitle = "Round 1"
                shadow     = colors.round1TitleShadow.value
            case .second:
                roundTitle = "Round 2"
                shadow     = colors.round2TitleShadow.value
            case .third:
                roundTitle = "Round 3"
                shadow     = colors.round3TitleShadow.value
        }
        return Text(roundTitle)
                .font(rubik.black.with(Size: 118))
                .foregroundColor(.white)
                .shadow(color: shadow, radius: 6, x: -7, y: 7)
    }
    
    //MARK: - MainBody
    var body: some View {
        roundTitle
        .landScape()
    }
    
    
}

另一件事是在按下导航栏后退按钮后，它不会强制视图返回纵向模式。以下是现场照片：

【问题讨论】：

标签： swift swiftui swiftui-navigationview swiftui-layout

【解决方案1】：

你已经设置了导航栏

struct RoundIntro: View {

但是你应该将 hidden = true 属性设置为相应的 UIViewController 的导航栏

【讨论】：

只有在 iphone 11 pro max 和 iphone 8 plus 上才这样......