ios - 如何在 iPad 中显示 Actionsheet

Question

如何显示 UIActionsheet在 iPad 中，当我使用我当前的代码时，它给了我这个错误:

Your application has presented a UIAlertController (<UIAlertController: 0x7f9ec624af70>) of style UIAlertControllerStyleActionSheet. The modalPresentationStyle of a UIAlertController with this style is UIModalPresentationPopover. You must provide location information for this popover through the alert controller's popoverPresentationController. You must provide either a sourceView and sourceRect or a barButtonItem. If this information is not known when you present the alert controller, you may provide it in the UIPopoverPresentationControllerDelegate method -prepareForPopoverPresentation.

这在 iPhone 上工作得很好:

let optionMenu = UIAlertController(title: nil, message: nil, preferredStyle: .ActionSheet)
let reminderAction = UIAlertAction(title: "Reminder", style: .Default, handler: {
                (alert: UIAlertAction!) -> Void in }
optionMenu.addAction(reminderAction)
self.presentViewController(optionMenu, animated: true, completion: nil)

我遇到过一些类似的问题，解决方案是这样的:

let optionMenu = UIAlertController(title: nil, message: nil, preferredStyle: .ActionSheet)
optionMenu.popoverPresentationController?.sourceView = self.view
optionMenu.popoverPresentationController?.sourceRect = self.view.bounds

但它对我不起作用，可能是因为我的 ActionSheet 的发件人在 UItableviewCell 上。

我厌倦了将 AlertController 的 Sourceview 设置为 tableView 的 Cell，但它没有正确放置，有时它部分可见这是我尝试过的:

optionMenu.popoverPresentationController?.sourceView = currentCell.contentView
optionMenu.popoverPresentationController?.sourceRect = currentCell.contentView.bounds

有什么线索可以解决这个问题吗？

Answer 1

下面给出的示例代码适用于 iPhone 和 iPad。

 guard let viewRect = sender as? UIView else {
            return
        }

    let cameraSettingsAlert = UIAlertController(title: NSLocalizedString("Please choose a course", comment: ""), message: NSLocalizedString("", comment: ""), preferredStyle: .ActionSheet)
    cameraSettingsAlert.modalPresentationStyle = .Popover

    let photoResolutionAction = UIAlertAction(title: NSLocalizedString("Photo Resolution", comment: ""), style: .Default) { action in

    }
    let cameraOrientationAction = UIAlertAction(title: NSLocalizedString("Camera Orientation", comment: ""), style: .Default) { action in

    }
    let flashModeAction = UIAlertAction(title: NSLocalizedString("Flash Mode", comment: ""), style: .Default) { action in

    }
    let timeStampOnPhotoAction = UIAlertAction(title: NSLocalizedString("Time Stamp on Photo", comment: ""), style: .Default) { action in

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

    }
    cameraSettingsAlert.addAction(cancel)
    cameraSettingsAlert.addAction(cameraOrientationAction)
    cameraSettingsAlert.addAction(flashModeAction)
    cameraSettingsAlert.addAction(timeStampOnPhotoAction)
    cameraSettingsAlert.addAction(photoResolutionAction)

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