ios - 无法从没有窗口的 View 中呈现弹出框 - presentPopoverFromBarButtonItem

我试图在 UIBarButtonItem 上显示一个 UIPopover。 我收到此错误:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIPopoverController presentPopoverFromBarButtonItem:permittedArrowDirections:animated:]: Popovers cannot be presented from a view which does not have a window.'

这是我的代码:

Pop *controller;
UIPopoverController *popoverController;
controller = [[Pop alloc] initWithNibName"op" bundle:nil];
popoverController = [[UIPopoverController alloc] initWithContentViewController:controller];

[popoverController presentPopoverFromBarButtonItem:self.navigationItem.rightBarButtonItem permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

解决方案

现在效果很好:

Pop *controller = [[Pop alloc] initWithNibName"op" bundle:nil];
UIPopoverController *popoverController = [[UIPopoverController alloc] initWithContentViewController:controller];
popoverController.delegate=self;

[popoverController presentPopoverFromBarButtonItem:sender permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];

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Best Answer-推荐答案

弹出框必须呈现在另一个 View Controller 的顶部，您不能让弹出框漂浮在半空中。只需创建一个 View Controller 来呈现 View Controller 。

UIViewController *vc = [[UIViewController alloc] initWithNibName"ViewController" bundle:[NSBundle mainBundle]];
self.window.rootViewController = vc;
[self.window makeKeyAndVisible];

然后创建并展示您的弹出框。

关于ios - 无法从没有窗口的 View 中呈现弹出框 - presentPopoverFromBarButtonItem，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/18552441/