UISplitViewController 代理方法

 
 
@protocol UISplitViewControllerDelegate
 
@optional
1、
// Called when a button should be added to a toolbar for a hidden view controller.
// Implementing this method allows the hidden view controller to be presented via a swipe gesture if 'presentsWithGesture' is 'YES' (the default).
- (void)splitViewController:(UISplitViewController *)svc willHideViewController:(UIViewController *)aViewController withBarButtonItem:(UIBarButtonItem *)barButtonItem forPopoverController:(UIPopoverController *)pc;
代理4返回YES时走此方法，一般实现横屏到竖屏动作：
  barButtonItem.title = NSLocalizedString(@"Presidents", @"Presidents");
    [self.navigationItem setLeftBarButtonItem:barButtonItem animated:YES];
    self.masterPopoverController = popoverController;
 
2、
// Called when the view is shown again in the split view, invalidating the button and popover controller.
- (void)splitViewController:(UISplitViewController *)svc willShowViewController:(UIViewController *)aViewController invalidatingBarButtonItem:(UIBarButtonItem *)barButtonItem;
1代理走后又要出现左边导航时调用，一般实现：
[self.navigationItemsetLeftBarButtonItem:nilanimated:YES];
    self.masterPopoverController = nil;
 
3、
// Called when the view controller is shown in a popover so the delegate can take action like hiding other popovers.
- (void)splitViewController:(UISplitViewController *)svc popoverController:(UIPopoverController *)pc willPresentViewController:(UIViewController *)aViewController;
这发生在portrait模式下，用户单击屏幕上方的按钮弹出导航UIPopoverController信息时走此方法。
 
4、
// Returns YES if a view controller should be hidden by the split view controller in a given orientation.
// (This method is only called on the leftmost view controller and only discriminates portrait from landscape.)
- (BOOL)splitViewController:(UISplitViewController *)svc shouldHideViewController:(UIViewController *)vc inOrientation:(UIInterfaceOrientation)orientation NS_AVAILABLE_IOS(5_0);
一般不实现
 
@end