如何在 UISplitViewController 中折叠 ViewController

Question

我有一个SplitViewController 我已经在代码中实例化了。

masterVC = [[MasterViewController alloc] init];
DetailViewController *detailVC = [[DetailViewController alloc] init];
masterVC.detailViewController = [[UINavigationController alloc] initWithRootViewController:detailVC];
...
_splitViewController =  [[UISplitViewController alloc] init];
_navigationController = [[UINavigationController alloc] initWithRootViewController:masterVC];
...
_splitViewController.viewControllers = @[_navigationController, masterVC.detailViewController];
_splitViewController.preferredDisplayMode = UISplitViewControllerDisplayModeAllVisible;
...
self.window.rootViewController = _splitViewController;

90% 的时间我都希望 ViewControllers 都像在设置应用程序中一样显示，这就是这样做的。但是现在有些情况下，我希望将左侧 _navigationController 的可见性切换几分钟，然后再返回默认的 2 列设置。

如何折叠左侧？我能想到的唯一方法是重新定义self.window.rootViewController 并将其设置为masterVC.detailViewController。

难道没有更“灵活”的方式吗？

谢谢

Answer 1

您可以使用显示模式按钮项来隐藏或显示母版。

detailViewController.navigationItem.leftBarButtonItem = self.splitViewController.displayModeButtonItem;
detailViewController.navigationItem.leftItemsSupplementBackButton = YES;

主从项目提供了折叠 splitViewController 的示例代码。详情请参阅UISplitViewControllerDelegate。

更新：

这是您询问的请求的委托代码：

- (BOOL)splitViewController:(UISplitViewController *)splitViewController collapseSecondaryViewController:(UIViewController *)secondaryViewController ontoPrimaryViewController:(UIViewController *)primaryViewController {
    if ([secondaryViewController isKindOfClass:[UINavigationController class]] && [[(UINavigationController *)secondaryViewController topViewController] isKindOfClass:[DetailViewController class]] && ([(DetailViewController *)[(UINavigationController *)secondaryViewController topViewController] detailItem] == nil)) {
        // Return YES to indicate that we have handled the collapse by doing nothing; the secondary controller will be discarded.
        return YES;
    } else {
        return NO;
    }
}

- (UIViewController *)splitViewController:(UISplitViewController *)splitViewController
separateSecondaryViewControllerFromPrimaryViewController:(UIViewController *)primaryViewController{

    if ([primaryViewController isKindOfClass:[UINavigationController class]]) {
        for (UIViewController *controller in [(UINavigationController *)primaryViewController viewControllers]) {
            if ([controller isKindOfClass:[UINavigationController class]] && [[(UINavigationController *)controller visibleViewController] isKindOfClass:[NoteViewController class]]) {
                return controller;
            }
        }
    }

    // No detail view present
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    UINavigationController *detailView = [storyboard instantiateViewControllerWithIdentifier:@"detailView"];

    // Ensure back button is enabled
    UIViewController *controller = [detailView visibleViewController];
    controller.navigationItem.leftBarButtonItem = self.splitViewController.displayModeButtonItem;
    controller.navigationItem.leftItemsSupplementBackButton = YES;

    return detailView;

}