ActionSheet 不工作 iPad [英] ActionSheet not working iPad

问题描述

我在我的应用程序中使用 ActionSheet.在我的 iPhone 上它可以工作，但在 iPad 模拟器上却没有.

I'm using ActionSheet in my application. On my iPhone it works, but it doesn't on the iPad simulator.

这是我的代码:

@IBAction func dialog(sender: AnyObject) {

    let optionMenu = UIAlertController(title: nil, message: "Choose Option", preferredStyle: .ActionSheet)
    let deleteAction = UIAlertAction(title: "Delete", style: .Default, handler: {

        (alert: UIAlertAction!) -> Void in
        println("Filtre Deleted")
    })

    let cancelAction = UIAlertAction(title: "Cancel", style: .Cancel, handler: {
        (alert: UIAlertAction!) -> Void in
        println("Cancelled")
    })

    optionMenu.addAction(deleteAction)
    optionMenu.addAction(cancelAction)

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

还有我的错误:

由于未捕获的异常NSGenericException"而终止应用程序，原因:'您的应用程序提供了一个 UIAlertController() 的风格UIAlertControllerStyleActionSheet.的 modalPresentationStyle这种风格的 UIAlertController 是 UIModalPresentationPopover.你必须通过警报提供此弹出窗口的位置信息控制器的 popoverPresentationController.您必须提供一个sourceView 和 sourceRect 或 barButtonItem.如果这些信息是不知道何时呈现警报控制器，您可以在UIPopoverPresentationControllerDelegate 方法-prepareForPopoverPresentation.'

Terminating app due to uncaught exception 'NSGenericException', reason: 'Your application has presented a UIAlertController () 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.'

推荐答案

您需要在显示 optionMenu 之前提供源视图或按钮，因为在 iPad 上它是一个 UIPopoverPresentationController，正如它在您的错误中所说的那样.这只是意味着您的操作表指向按钮，让用户知道它从哪里开始.

You need to provide a source view or button just before presenting optionMenu since on iPad its a UIPopoverPresentationController, As it says in your error. This just means that your action sheet points to the button letting the user know where it started from.

例如，如果您通过点击右侧导航栏项目来显示您的选项菜单.你可以这样做:

For example if you're presenting your optionMenu by tapping on the right navigation bar item. You could do something like this:

optionMenu.popoverPresentationController?.barButtonItem = self.navigationItem.rightBarButtonItem

self.presentViewController(optionMenu, animated: true, completion: nil)

或者你可以设置一个这样的视图:(你只需要这两个中的一个)

or you could set a view like this:(You just need one of these 2)

optionMenu.popoverPresentationController?.sourceView = yourView

self.presentViewController(optionMenu, animated: true, completion: nil)

另外请记住，如果您将 UIAlertControllerStyle 更改为 Alert 而不是操作表，则无需指定此项.我相信您一定已经想通了，但我只是想帮助遇到此页面的任何人.

Also keep in mind that if you change your UIAlertControllerStyle to Alert instead of action sheet, You wouldn't need to specify this. I am sure you must have figured it out but i just wanted to help anyone who comes across this page.

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