UIPopoverPresentationController on iPad

Question

当我们选择语言时，我想在UIPopoverPresentationController中显示一个UIPopoverPresentationController，就像iOS设置应用程序。它展示了一个viewController在设备屏幕的中心！

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但是，我的结果不是那样的！

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这是我的密码：

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)
}

代表：

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

尝试将演示文稿样式设置为工作表：

detailVC.modalPresentationStyle = UIModalPresentation.FormSheet