ios - 如何观察 UIPopoverController 何时被解雇？

Question

UISplitViewController有委托方法：

-(void)splitViewController:(UISplitViewController *)svc popoverController:(UIPopoverController *)pc willPresentViewController:(UIViewController *)aViewController

我希望从类似但不存在的委托方法中获取功能：

-(void)splitViewController:(UISplitViewController *)svc popoverController:(UIPopoverController *)pc willDismissViewController:(UIViewController *)aViewController

UISplitViewController考虑到//通常考虑到这样做的最佳方法的想法不符合 KVO UIPopoverController，UIKit因此我无法向UIPopoverController' 的isPopoverVisible属性添加观察者。

谢谢

回答：

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

    self.popoverController = pc;
    [self.popoverController setDelegate:self];
}

-(void)splitViewController:(UISplitViewController *)svc popoverController:(UIPopoverController *)pc willPresentViewController:(UIViewController *)aViewController
{
    NSLog(@"SHOWING POPOVER");
}

- (void)popoverControllerDidDismissPopover:(UIPopoverController *)popoverController
{
    NSLog(@"HIDING POPOVER");
}

Answer 1

想通了，UIPopoverController除了UISplitViewControllerDelegate：

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

    self.popoverController = pc;
    [self.popoverController setDelegate:self];
}

-(void)splitViewController:(UISplitViewController *)svc popoverController:(UIPopoverController *)pc willPresentViewController:(UIViewController *)aViewController
{
    NSLog(@"SHOWING POPOVER");
}

- (void)popoverControllerDidDismissPopover:(UIPopoverController *)popoverController
{
    NSLog(@"HIDING POPOVER");
}

Answer 2

当你收到第一个委托通知时，你会收到一个对 UIPopoverController 的引用，它将显示隐藏的视图控制器。注册为其委托，然后使用-popoverControllerDidDismissPopover:UIPopoverControllerDelegate 协议中的委托方法。