UISplitViewController在纵向：如何隐藏主popover编程？ [英] UISplitViewController in portrait: how to hide master popover programatically?

问题描述

在我的 UISplitViewController 中，主控制器是一个 UINavigationController 。
在纵向模式下，只要用户向上导航（使用后退按钮），我想保持导航控制器可见。只要选择了导航控制器的表视图中的项目，我就要关闭弹出框。
我如何实现这一点？我的 UITableViewController 如何知道它是否在弹出窗口中，如果是，请关闭自己？

In my UISplitViewController the master controller is a UINavigationController. When in portrait mode I would like to keep the navigation controller visible as long as the user navigates upwards (using the back button). As soon as an item from the table view of the navigation controller is selected, I want to dismiss the popover. How can I achieve this? How can my UITableViewController know if it is inside a popover, and if yes, dismiss itself?

推荐答案

使您的主视图控制器 UISplitViewControllerDelegate （如果还没有），并将其连接到UISplitViewController的 delegate outlet。

Make your main view controller a UISplitViewControllerDelegate (if it isn't already) and wire it up to the UISplitViewController's delegate outlet.

在主视图控制器中创建一个 UIPopoverController

Create a UIPopoverController variable in your main view controller:

// MyViewController.h
@interface MyViewController : UIViewController <UISplitViewControllerDelegate> {
    UIPopoverController *popoverController;
}
@property (retain, nonatomic) UIPopoverController *popoverController;

// MyViewController.m
@synthesize popoverController;

实现以下UISplitViewControllerDelegate方法：

Implement the following UISplitViewControllerDelegate methods:

// Called when rotating to portrait
- (void)splitViewController:(UISplitViewController*)svc
     willHideViewController:(UIViewController *)aViewController
          withBarButtonItem:(UIBarButtonItem*)barButtonItem
       forPopoverController:(UIPopoverController*)pc {

    // Popover controller is visible in portrait
    self.popoverController = pc;
}

// Called when rotating to landscape
- (void)splitViewController:(UISplitViewController*)svc
     willShowViewController:(UIViewController *)aViewController
  invalidatingBarButtonItem:(UIBarButtonItem *)barButtonItem {

    // No popover controller in landscape view
    self.popoverController = nil;
}

在主视图控制器在表视图中选择导航项）：

In your own handler in the main view controller (the one that gets called when a naviation item is selected in the table view):

- (void)navigationControllerSelectedItem:(id)item {
    // If a popover controller is visible, hide it
    if (popoverController) {
        [popoverController dismissPopoverAnimated:YES];
    }
}

并且不要忘记释放那个变量： / p>

And don't forget to release that variable:

- (void)dealloc {
    self.popoverController = nil;
    [super dealloc];
}

希望有所帮助！

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