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使用iOS 8在iPad上正确呈现UIAlertController

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在iOS 8.0中，Apple引入了UIAlertController来取代UIActionSheet . 不幸的是，Apple没有添加任何有关如何呈现它的信息 . 我在hayaGeek 's blog, however, it doesn'上找到了关于它的entry似乎可以在iPad上运行 . 视图完全错位：

错位：
Misplaced image

正确：
enter image description here

我使用以下代码在界面上显示它：

let alert = UIAlertController()
    // setting buttons
    self.presentModalViewController(alert, animated: true)

还有其他方法可以为iPad添加它吗？或者苹果只是忘了iPad，还是没有实现？

ios ipad user-interface uialertcontroller

6 回答

  • 1

    在Swift 2中，你想做这样的事情来在iPhone和iPad上正确显示它：

    func confirmAndDelete(sender: AnyObject) {
    guard let button = sender as? UIView else {
        return
    }

    let alert = UIAlertController(title: NSLocalizedString("Delete Contact?", comment: ""), message: NSLocalizedString("This action will delete all downloaded audio files.", comment: ""), preferredStyle: .ActionSheet)
    alert.modalPresentationStyle = .Popover

    let action = UIAlertAction(title: NSLocalizedString("Delete", comment: ""), style: .Destructive) { action in
        EarPlaySDK.deleteAllResources()
    }
    let cancel = UIAlertAction(title: NSLocalizedString("Cancel", comment: ""), style: .Cancel) { action in

    }
    alert.addAction(cancel)
    alert.addAction(action)

    if let presenter = alert.popoverPresentationController {
        presenter.sourceView = button
        presenter.sourceRect = button.bounds
    }
    presentViewController(alert, animated: true, completion: nil)
}

    如果您未设置演示者，则最终会在 -[UIPopoverPresentationController presentationTransitionWillBegin] 上的iPad上出现例外情况，并显示以下消息：

    致命异常：NSGenericException您的应用程序提供了样式UIAlertControllerStyleActionSheet的UIAlertController（<UIAlertController：0x17858a00>） . 具有此样式的UIAlertController的modalPresentationStyle是UIModalPresentationPopover . 您必须通过警报控制器的popoverPresentationController为此弹出窗口提供位置信息 . 您必须提供sourceView和sourceRect或barButtonItem . 如果在显示警报控制器时未知此信息，则可以在UIPopoverPresentationControllerDelegate方法-prepareForPopoverPresentation中提供该信息 .

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  • 72

    Update for Swift 3.0 and higher

    let actionSheetController: UIAlertController = UIAlertController(title: "SomeTitle", message: nil, preferredStyle: .actionSheet)

    let editAction: UIAlertAction = UIAlertAction(title: "Edit Details", style: .default) { action -> Void in

        print("Edit Details")
    }

    let deleteAction: UIAlertAction = UIAlertAction(title: "Delete Item", style: .default) { action -> Void in

        print("Delete Item")
    }

    let cancelAction: UIAlertAction = UIAlertAction(title: "Cancel", style: .cancel) { action -> Void in }

    actionSheetController.addAction(editAction)
    actionSheetController.addAction(deleteAction)
    actionSheetController.addAction(cancelAction)

//        present(actionSheetController, animated: true, completion: nil)   // doesn't work for iPad

    actionSheetController.popoverPresentationController?.sourceView = yourSourceViewName // works for both iPhone & iPad

    present(actionSheetController, animated: true) {
        print("option menu presented")
    }
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  • 96

    在iPad上，警报将使用新的_289656显示为弹出窗口，它要求您使用sourceView和sourceRect或barButtonItem为弹出窗口的表示指定锚点

    • barButtonItem

    • sourceView

    • sourceRect

    为了指定锚点，您需要获取对UIAlertController的UIPopoverPresentationController的引用，并设置其中一个属性，如下所示：

    alertController.popoverPresentationController.barButtonItem = button;

    示例代码：

    UIAlertAction *actionDelete = nil;
UIAlertAction *actionCancel = nil;

// create action sheet
UIAlertController *alertController = [UIAlertController
                                      alertControllerWithTitle:actionTitle message:nil
                                      preferredStyle:UIAlertControllerStyleActionSheet];

// Delete Button
actionDelete = [UIAlertAction
                actionWithTitle:NSLocalizedString(@"IDS_LABEL_DELETE", nil)
                style:UIAlertActionStyleDestructive handler:^(UIAlertAction *action) {

                    // Delete
                    // [self deleteFileAtCurrentIndexPath];
                }];

// Cancel Button
actionCancel = [UIAlertAction
                actionWithTitle:NSLocalizedString(@"IDS_LABEL_CANCEL", nil)
                style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {
                    // cancel
                    // Cancel code
                }];

// Add Cancel action
[alertController addAction:actionCancel];
[alertController addAction:actionDelete];

// show action sheet
alertController.popoverPresentationController.barButtonItem = button;
alertController.popoverPresentationController.sourceView = self.view;

[self presentViewController:alertController animated:YES
                 completion:nil];
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  • 7

    您可以使用 UIPopoverPresentationController 从弹出框中显示 UIAlertController .

    在Obj-C中：

    UIViewController *self; // code assumes you're in a view controller
UIButton *button; // the button you want to show the popup sheet from

UIAlertController *alertController;
UIAlertAction *destroyAction;
UIAlertAction *otherAction;

alertController = [UIAlertController alertControllerWithTitle:nil
                                                      message:nil
                           preferredStyle:UIAlertControllerStyleActionSheet];
destroyAction = [UIAlertAction actionWithTitle:@"Remove All Data"
                                         style:UIAlertActionStyleDestructive
                                       handler:^(UIAlertAction *action) {
                                           // do destructive stuff here
                                       }];
otherAction = [UIAlertAction actionWithTitle:@"Blah"
                                       style:UIAlertActionStyleDefault
                                     handler:^(UIAlertAction *action) {
                                         // do something here
                                     }];
// note: you can control the order buttons are shown, unlike UIActionSheet
[alertController addAction:destroyAction];
[alertController addAction:otherAction];
[alertController setModalPresentationStyle:UIModalPresentationPopover];

UIPopoverPresentationController *popPresenter = [alertController 
                                              popoverPresentationController];
popPresenter.sourceView = button;
popPresenter.sourceRect = button.bounds;
[self presentViewController:alertController animated:YES completion:nil];
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  • 240

    这是一个快速的解决方案：

    NSString *text = self.contentTextView.text;
NSArray *items = @[text];

UIActivityViewController *activity = [[UIActivityViewController alloc]
                                      initWithActivityItems:items
                                      applicationActivities:nil];

activity.excludedActivityTypes = @[UIActivityTypePostToWeibo];

if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
    //activity.popoverPresentationController.sourceView = shareButtonBarItem;

    activity.popoverPresentationController.barButtonItem = shareButtonBarItem;

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

}
[self presentViewController:activity animated:YES completion:nil];
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  • 18

    2018年更新

    我刚刚因为这个原因拒绝了应用程序，并且很快就解决了从使用操作表到警报的过程 .

    工作了一个魅力，并通过App Store测试员就好了 .

    对于每个人来说可能不是一个合适的答案，但我希望这能帮助你们中的一些人迅速摆脱困境 .

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