iPad上的UIPopoverPresentationController

Question

我想在UIPopoverPresentationController（如iOS设置应用程序）中显示viewController，当我们选择语言时。它在设备屏幕的中心呈现一个viewController！

但是，我的结果不是那样的！

这是我的代码：

func rightButtonPressed(rightBarButton: UIBarButtonItem) { 
    let detailVC = self.storyboard?.instantiateViewControllerWithIdentifier("ExampleViewController") as! ExampleViewController 
    detailVC.modalPresentationStyle = .Popover 
    let popOverVC = detailVC.popoverPresentationController 
    popOverVC?.permittedArrowDirections = .Any 
    popOverVC?.barButtonItem = rightBarButton 
    popOverVC?.sourceView = self.view 
    popOverVC?.delegate = self 

    self.presentViewController(detailVC, animated: true, completion: nil) 
} 

和委托：

extension DetailViewController: UIPopoverPresentationControllerDelegate { 
    func adaptivePresentationStyleForPresentationController(controller: UIPresentationController) -> UIModalPresentationStyle { 
     debugPrint(controller.description) 
     return .Popover 
    } 

    func presentationController(controller: UIPresentationController, viewControllerForAdaptivePresentationStyle style: UIModalPresentationStyle) -> UIViewController? { 
     let navController = UINavigationController.init(rootViewController: controller.presentedViewController) 
     return navController 
    } 
} 

Answer 1

尝试呈现样式设置为表：

detailVC.modalPresentationStyle = UIModalPresentation.FormSheet