iphone - 为什么我的 TabBar 按钮不能在 iPad 上自动调整大小？

Question

我正在构建一个通用的 iOS 应用程序，iPad 版本使用 SplitViewController。在弹出 View 中，我有一个带有两个按钮的 UITabBarController。当它在 iPhone 上运行时，TabBar 按钮会正确拉伸(stretch)以填充 View 的整个宽度...

...但是在 iPad 上，在弹出 View 中，按钮不会拉伸(stretch)以填满整个宽度...

我正在以编程方式创建 UITabBarController...

InspectionTabBarViewController *inspectionTabBarVC;
    InspectionListViewController *inspectionListVC;
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

 if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {

        inspectionListVC = [[InspectionListViewController alloc] initWithSunday:NO];
        inspectionListVC.managedObjectContext = self.managedObjectContext;
        UINavigationController *calendarNavVC = [[UINavigationController alloc] initWithRootViewController:inspectionListVC];
        calendarNavVC.title = @"Calendar";

        InspectionMapViewController *mapViewVC = [[InspectionMapViewController alloc] initWithNibName:@"InspectionMapView_iPhone" bundle:nil];
        UINavigationController *mapdNavVC = [[UINavigationController alloc] initWithRootViewController:mapViewVC];
        mapdNavVC.title = @"Map";

        inspectionTabBarVC = [[InspectionTabBarViewController alloc] init];
        [inspectionTabBarVC addChildViewController:calendarNavVC];
        [inspectionTabBarVC addChildViewController:mapdNavVC];
        self.window.rootViewController = inspectionTabBarVC;
    } 
    else 
    {
        inspectionListVC = [[InspectionListViewController alloc] initWithSunday:NO];
        UINavigationController *calendarNavVC = [[UINavigationController alloc] initWithRootViewController:inspectionListVC];
        calendarNavVC.title = @"Calendar";

        InspectionMapViewController *mapViewVC = [[InspectionMapViewController alloc] initWithNibName:@"InspectionMapView_iPad" bundle:nil];
        UINavigationController *mapdNavVC = [[UINavigationController alloc] initWithRootViewController:mapViewVC];
        mapdNavVC.title = @"Map";

        inspectionTabBarVC = [[InspectionTabBarViewController alloc] init];
        [inspectionTabBarVC addChildViewController:calendarNavVC];
        [inspectionTabBarVC addChildViewController:mapdNavVC];

        DetailViewController *detailViewController = [[DetailViewController alloc] initWithNibName:@"DetailViewController_iPad" bundle:nil];
        UINavigationController *detailNavigationController = [[UINavigationController alloc] initWithRootViewController:detailViewController];

        self.splitViewController = [[UISplitViewController alloc] init];
        self.splitViewController.delegate = detailViewController;
        self.splitViewController.viewControllers = [NSArray arrayWithObjects:inspectionTabBarVC, detailNavigationController, nil];

        self.window.rootViewController = self.splitViewController;
        inspectionListVC.detailViewController = detailViewController;
        inspectionListVC.managedObjectContext = self.managedObjectContext;

        detailViewController.detailViewControllerDelegate = inspectionListVC;
    }

    [self.window makeKeyAndVisible];

我还尝试使用以下语句在 InspectionTabBarViewController 的 loadView 方法中设置 autoResizeMask...

self.tabBar.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleWidth;

...但这也没有用。如何让 UITabBar 按钮填满整个 View 的宽度？

非常感谢您的帮助!

Answer 1

将 UITabBar 属性 itemPositioning 更改为 UITabBarItemPositioningFill:

self.tabBar.itemPositioning = UITabBarItemPositioningFill;

快速版本:

tabBar.itemPositioning = .fill

UITabBar itemPositioning reference