UISplitViewController中的肖像:如何以编程方式隐藏主弹出窗口? [英] UISplitViewController in portrait: how to hide master popover programmatically?

问题描述

在我的UISplitViewController中，主控制器是UINavigationController. 在纵向模式下，只要用户向上导航(使用后退"按钮)，我希望保持导航控制器可见.一旦从导航控制器的表格视图中选择了一个项目，我想关闭弹出窗口. 我怎样才能做到这一点?我的UITableViewController如何知道它是否位于弹出窗口中，如果是，则将其自身关闭?

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

为主视图控制器添加一个UISplitViewControllerDelegate(如果尚未安装)，并将其连接到UISplitViewController的delegate插座.

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变量:

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;

实施以下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;
}

在主视图控制器的自己处理程序中(在表视图中选择导航项时调用的处理程序):

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];
    }
}

别忘了释放该变量:

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

希望有帮助！

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