Objective c 强制隐藏细节视图后未调用UISplitViewController willHideViewController/willShowViewController

我有一个iPad应用程序，它使用UISplitViewController作为根控制器，我已经设置了代理，我使用UINavigationController作为详细视图，它似乎工作正常

我希望在DetailView区域中显示特定的viewcontroller时，MasterViewController始终处于隐藏状态（在所有旋转中）。我可以使用UISplitViewController委托上的shouldHideViewController方法来完成此操作

但是，如果这样做，则当我将DetailView部分中的ViewController更改为另一个时，将显示主视图，但在代理中既不调用willHideViewController也不调用willShowViewController

如果我旋转设备并将其旋转回去，则会调用它们，并按预期工作，但在设备旋转并旋转回原始方向之前不会调用它们

这会导致主视图显示后的第一次旋转中不显示弹出按钮

- (void)splitViewController:(UISplitViewController*)svc willHideViewController:(UIViewController *)aViewController withBarButtonItem:(UIBarButtonItem*)barButtonItem forPopoverController:(UIPopoverController*)pc {

// Keep references to the popover controller and the popover button, and tell the detail view controller to show the button.
barButtonItem.title = @"Survey Sections";
self.popoverController = pc;
self.rootPopoverButtonItem = barButtonItem;

UIViewController <SubstitutableDetailViewController> *detailViewController = [self.splitViewController.viewControllers objectAtIndex:1];

if ([detailViewController isKindOfClass:[UINavigationController class]]) {
    UINavigationController *detailNavController = (UINavigationController *)detailViewController;
    [[detailNavController.viewControllers objectAtIndex:0] showRootPopoverButtonItem:rootPopoverButtonItem];
}

---

}

我遇到了一个非常类似的问题，将苹果的示例代码与

SubstitutableDetailViewController

委托和旋转结合使用

我所做的是为方向为横向时存储一个

BOOL

，并使用以下代码在

willRotateToInterfaceOrientation

上更新它：

isLandscape=UIInterfaceOrientationIsLandscape（self.interfaceOrientation）

在
viewwillbeen
上，我检查了当前方向是否为横向，如果与存储的值不匹配，则调用此方法：

-(void)adjustLayoutForOrientation{
    if (isLandscape) {
        [self invalidateRootPopoverButtonItem:  self.navigationController.navigationItem.leftBarButtonItem];
}else{
        LeftViewController *lvc = (LeftViewController *)[self.splitViewController delegate];
        [self showRootPopoverButtonItem:  lvc.rootPopoverButtonItem ];
    }
}

显然，我使用的是Apple提供的委派代码，但为了完整起见，这些方法如下所示，并且可以轻松实现：

#pragma mark -
#pragma mark Managing the popover

- (void)showRootPopoverButtonItem:(UIBarButtonItem *)barButtonItem {
    // Add the popover button to the left navigation item.
    [self.navigationController.navigationBar.topItem setLeftBarButtonItem:barButtonItem animated:NO];
}


- (void)invalidateRootPopoverButtonItem:(UIBarButtonItem *)barButtonItem {
    // Remove the popover button.
    [self.navigationController.navigationBar.topItem setLeftBarButtonItem:nil animated:NO];
}

主视图控制器（左侧）正在维护对
rootpopovoverbuttonItem
的引用，这使得此功能得以实现

编辑：请注意，我还在
viewdiload
上调用我的
adjustLayoutForOrientation
方法，并且
将旋转到InterfaceOrientation
。。。更好的方法可能是向通知中心注册，但我不确定后台/不可见视图控制器是否会收到这些通知

-(void)adjustLayoutForOrientation{
    if (isLandscape) {
        [self invalidateRootPopoverButtonItem:  self.navigationController.navigationItem.leftBarButtonItem];
}else{
        LeftViewController *lvc = (LeftViewController *)[self.splitViewController delegate];
        [self showRootPopoverButtonItem:  lvc.rootPopoverButtonItem ];
    }
}

#pragma mark -
#pragma mark Managing the popover

- (void)showRootPopoverButtonItem:(UIBarButtonItem *)barButtonItem {
    // Add the popover button to the left navigation item.
    [self.navigationController.navigationBar.topItem setLeftBarButtonItem:barButtonItem animated:NO];
}


- (void)invalidateRootPopoverButtonItem:(UIBarButtonItem *)barButtonItem {
    // Remove the popover button.
    [self.navigationController.navigationBar.topItem setLeftBarButtonItem:nil animated:NO];
}