检测popover dismiss

Question

我想玩UIPopupController，我明白我无法检测到我的popover何时解雇。 我的步骤：
1.从XCode创建示例（文件 - ＆gt;新项目 - ＆gt;实用应用程序）
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中：

    - (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");
    }

但是当我点击某处，并且popover消失时，Console中没有NSLog消息。 我做错了什么？

Answer 1

将popover的委托设置为self，你也可以使用两个popover代理，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 2

早期的答案建议使用UIPopoverControllerDelegate，这似乎是实现目标的唯一合理方式。我认为添加一个实际的例子会很好，因为它不是最简单的事情。我的要求很简单 - 我希望背景视图模糊，而弹出窗口是可见的，所以这里是步骤：

1. 在故事板中连接您的popover，在目标视图控制器属性中配置它的弹出窗口内容大小。

2. 通过打开.h文件并执行以下操作，使源视图控制器成为UIPopoverControllerDelegate：

   @interface MyController : UIViewController <UIPopoverControllerDelegate>
   

3. 覆盖prepareForSegue，将源视图控制器指定为弹出窗口的委托，然后在segue显示目标之前将alpha设置为0.5：

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

4. 实现popover委托方法popoverControllerDidDismissPopover。将alpha设置回1.0并取消分配给代表，以确保我们不会阻止ARC完成它的工作：

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

Answer 3

您是否将MainViewController实例设置为popover的委托？

（如果你通过代码创建popover） popover.delegate = self;

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
  }
}

并且

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

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