檢測popover關閉

Question

我想玩UIPopupController，並且我明白我無法檢測到我的popover關閉時。 我的步驟：
1.創建例如在Xcode（文件 - >新建項目 - > Utilitiy應用）
2.添加到MainViewController.h UIPopoverControllerDelegate

#import "FlipsideViewController.h" 

@interface MainViewController : UIViewController <FlipsideViewControllerDelegate,UIPopoverControllerDelegate> 

@property (strong, nonatomic) UIPopoverController *flipsidePopoverController; 

- (IBAction)showInfo:(id)sender; 

@end 

1. 在MainViewController：

 

    - (IBAction)showInfo:(id)sender 
    { 
     if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) { 
      FlipsideViewController *controller = [[FlipsideViewController alloc] initWithNibName:@"FlipsideViewController" bundle:nil]; 
      controller.delegate = self; 
      controller.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal; 
      [self presentModalViewController:controller animated:YES]; 
     } else { 
      if (!self.flipsidePopoverController) { 
       FlipsideViewController *controller = [[FlipsideViewController alloc] initWithNibName:@"FlipsideViewController" bundle:nil]; 
       controller.delegate = self; 

       self.flipsidePopoverController.delegate = self 

       self.flipsidePopoverController = [[UIPopoverController alloc] initWithContentViewController:controller]; 
      } 
      if ([self.flipsidePopoverController isPopoverVisible]) { 
       [self.flipsidePopoverController dismissPopoverAnimated:YES]; 
      } else { 
       [self.flipsidePopoverController presentPopoverFromBarButtonItem:sender permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES]; 
      } 
     } 
    } 

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

但是當我點擊某處並且popover消失時，控制檯中沒有NSLog消息。 我在做什麼錯？

Answer 1

您是否將您的MainViewController實例設置爲彈出窗口的代表？

（如果您創建通過代碼酥料餅） popover.delegate = self;

Answer 2

設置酥料餅自我的代表，你也可以使用兩個酥料餅的代表，即： -

/* Called on the delegate when the popover controller will dismiss the popover. Return NO to prevent the dismissal of the view. 
*/ 
- (BOOL)popoverControllerShouldDismissPopover:(UIPopoverController *)popoverController; 

/* Called on the delegate when the user has taken action to dismiss the popover. This is not called when -dismissPopoverAnimated: is called directly. 
*/ 
- (void)popoverControllerDidDismissPopover:(UIPopoverController *)popoverController; 

Answer 3

早些時候答案已經使用建議UIPopoverControllerDelegate似乎是實現目標的唯一明智的方式。我認爲增加一個實際的例子會很好，因爲這不是最簡單的事情。我的要求很簡單 - 我想是模糊的背景視圖而酥料餅是可見的，所以這裏的步驟：

1. 線了一個故事板的酥料餅，配置它在目標視圖控制器酥料餅的內容大小屬性。

2. 讓你的源視圖控制器打開.h文件，並做一些這樣的UIPopoverControllerDelegate：

   @interface MyController : UIViewController <UIPopoverControllerDelegate> 
   

3. 覆蓋prepareForSegue，分配你的源視圖控制器爲代表的酥料餅，然後設置阿爾法0.5之前的SEGUE提出目標：

   - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { 
       UIStoryboardPopoverSegue* popover = (UIStoryboardPopoverSegue*)segue; 
       popover.popoverController.delegate = self; 
       self.view.alpha = 0.5; 
   } 
   

4. 落實酥料餅的委託方法popoverControllerDidDismissPopover。設置阿爾法回到1.0和取消自己作爲代表，以確保我們不阻止ARC做的工作：

   -(void)popoverControllerDidDismissPopover:(UIPopoverController *)popoverController { 
       self.view.alpha = 1.0; 
       popoverController.delegate = nil; 
   } 
   

Answer 4

- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { 
UIStoryboardPopoverSegue *popoverSegue; 
popoverSegue = (UIStoryboardPopoverSegue *)segue; 
popoverController = popoverSegue.popoverController; 
pCVisible = YES; 
[[segue destinationViewController] setDelegate:self]; 
} 

- (void) setDataFromPopover { 
    if (pCVisible) { 
    [popoverController dismissPopoverAnimated:YES]; // THIS IS KEY! this is where the popover is dismissed, not in the popover itself 
    } 
} 

而且

//TableViewController.m 
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:  (NSIndexPath *)indexPath 
{ 
    //variable = whatever 

OtherViewController *initialView; 
initialView=(OtherViewController *)self.delegate; 
initialView.theLabel.text = variable; 
[initialView setDataFromPopover]; 
}