如何在iOS中以纵向模式实现SplitView功能？

我正在尝试在iOS应用程序中实现SplitView功能，它只有在iPad设备的横向模式下才能正常工作

如果启动应用程序或将其从横向模式旋转到纵向模式，splitView功能将崩溃

如何在iPhone（纵向和横向）和iPad（纵向模式）设备中实现SplitView功能

请在代码下面找到我的代码

- (BOOL)application:(UIApplication *)applicationdidFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen]bounds]];    
    UITabBarController *tabBarController = [[UITabBarController alloc] init];
    ViewController *masterViewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
    UINavigationController *masterNavigationController = [[UINavigationController alloc] initWithRootViewController:masterViewController];
    DetailViewController *detailViewController = [[DetailViewController alloc]initWithNibName:@"DetailViewController"
bundle:nil];
    UINavigationController *detailNavigationController = [[UINavigationController alloc] initWithRootViewController:detailViewController];
    masterViewController.detailViewController = detailViewController;
    self.splitViewController = [[CustomSplitViewController alloc]initWithNibName:@"CustomSplitViewController"  bundle:nil];
    self.splitViewController.viewControllers = @[masterNavigationController, detailNavigationController];
    TabBarDetailController *secondVC = [[TabBarDetailController alloc]initWithNibName:@"TabBarDetailController"  bundle:nil];
    secondVC.tabBarItem.title = @"Second";
    ThirdViewController *thirdVC = [[ThirdViewController alloc]initWithNibName:@"ThirdViewController"  bundle:nil];
    thirdVC.tabBarItem.title = @"Third";    
    FourthViewController *fourthVC =  [[FourthViewController alloc]initWithNibName:@"FourthViewController"  bundle:nil];
    fourthVC.tabBarItem.title = @"Fourth";    
    MoreViewController *moreVC =  [[MoreViewController alloc]initWithNibName:@"MoreViewController"  bundle:nil];
    moreVC.tabBarItem.title = @"More";

    //make an array containing view controllers
    NSArray *viewControllers = [NSArray arrayWithObjects:self.splitViewController,secondVC,thirdVC,fourthVC,moreVC,nil];
    [tabBarController setViewControllers:viewControllers];    
    self.splitViewController.tabBarItem.title = @"HOME";
    [self.window addSubview:tabBarController.view];
    self.window.rootViewController=tabBarController;
    [[self window] makeKeyAndVisible];
     return YES;
 }

提前谢谢。

---

您看过

。首选显示模式
？
UISplitViewController
基于大小类。从iOS 14开始（甚至可能是13），这意味着纵向的iPhone将始终显示您设置为紧凑型VC的内容，横向的iPhone将显示次要（4种尺寸）或紧凑型（6种尺寸）。至于ipad呢？不考虑真正的“分割屏幕”——即屏幕上有多个应用程序，它应该始终显示第二个VC，无论方向如何。我不知道你为什么在iPad上看到不同的东西。我最好的猜测是你的“根”VC层次结构，它看起来像是标签栏在根上。