Question

我正在开发iPad应用程序。在这个应用程序中，我使用以下代码

在presentViewController中显示ViewController

[self presentViewController:vc animated:YES completion:nil];

之后我在那个presentviewController中使用UIPopoverController显示弹出窗口而没有解雇＆＃34; vc＆＃34;。所以我在问题 Warning: Attempt to present <SelectionListViewController: 0x7b439960> on <ViewController: 0x7a341e00> which is already presenting (null)

之后遇到问题

因此，ViewController上没有显示弹出窗口。如何解决这个问题。这是现有项目，我现在需要解决这个问题。

先谢谢

Answer 1

以这种方式出现......

vc.modalPresentationStyle = UIModalPresentationPopover;


            UIPopoverPresentationController *popController = [vc popoverPresentationController];
            popController.permittedArrowDirections = UIPopoverArrowDirectionAny;
            popController.sourceView = self.view;


[[NSOperationQueue mainQueue] addOperationWithBlock:^{

                            [self presentViewController:vc animated:YES completion:nil];
                        }];

Answer 2

我认为performSelector调用中的presentViewController将解决您的问题。试试这2个方法

-(void) present
{
    [self performSelector: @selector(ShowSelectionListViewController) withObject: nil afterDelay: 0];
}

-(void) ShowSelectionListViewController
{
    [self presentViewController:SelectionListViewController animated: true completion: nil];
}

Answer 3

你应该尝试这个。它对我有用......

if([AppDelegate isIOS8])
        {
            dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.0 * NSEC_PER_SEC)), dispatch_get_main_queue(),
                 ^{[self.popover presentPopoverFromRect:popoverRect
                                              inView:self.view
                            permittedArrowDirections:UIPopoverArrowDirectionUp
                                            animated:YES];});
        }
        else
        {
            [self.popover presentPopoverFromRect:popoverRect
                                          inView:self.view
                        permittedArrowDirections:UIPopoverArrowDirectionAny
                                        animated:YES ];
        }

UIPopoverController没有出现在＆＃34; presentViewController＆＃34;

3 个答案: