ios - 在iPhone上显示UISplitViewController的详细 View Controller

我对如何在6 Plus以外的iPhone上处理拆分视图控制器感到困惑，因为6 Plus可以处理iPad等拆分视图控制器。我希望明细视图控制器成为那些iPhone上出现的根视图控制器。

编辑

通过添加这两个委托方法，我可以获得所需的行为。现在，拆分视图控制器折叠为详细信息视图控制器，而不是iPhone上的主视图控制器。

- (UIViewController *)primaryViewControllerForCollapsingSplitViewController:(UISplitViewController *)splitViewController
{
    return self.detailNavigationController;
}

- (BOOL)splitViewController:(UISplitViewController *)splitViewController collapseSecondaryViewController:(UIViewController *)secondaryViewController ontoPrimaryViewController:(UIViewController *)primaryViewController
{
    return YES;
}

问题1

当我将主视图控制器推到iPhone上的详细视图控制器的导航控制器上时，我正在控制台中收到此消息。它工作正常，所以我不明白为什么收到此消息。

Unbalanced calls to begin/end appearance transitions for <MasterTableViewController: 0x7fc8d2b67220>.

问题2

我尚不清楚检测分割视图控制器何时在iPhone上崩溃的首选方法。我正在使用UIViewControllerShowDetailTargetDidChangeNotification通知来检测此更改，但我觉得应该为此更改提供某种委托方法。

最佳答案

如果您使用默认模板创建了UISplitViewController，则可以在AppDelegate文件中找到此方法。

- (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;
    }
}

当返回YES时，此方法处理小屏幕设备中UISplitViewController的默认行为，要解决您的问题，您必须返回NO。用下面的代码替换该方法

- (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 NO;
    } else {
        return NO;
    }
}

看看documentation