在iOS8中的Popover中呈现UIAlertController [英] Present a UIAlertController from within a Popover in iOS8

问题描述

我设置一个UITableViewController在iPad上的弹出框中显示：

当我点击一行时，我会显示一条警告，警告用户可能存在破坏性行为。
我使用了新的UIAlertController，接下来会发生什么：

弹出窗口变得非常小（实际上是alertController视图的大小）。如果我按下取消，我可以看到结果：
<这是我的代码：

 覆盖func tableView（tableView：UITableView） ，didSelectRowAtIndexPath indexPath：NSIndexPath）{
 
 var previousSelectedCell：UITableViewCell？ 
 if checkedIndexPath！= nil {
 previousSelectedCell = tableView.cellForRowAtIndexPath（checkedIndexPath）
} 
 var selectedCell = tableView.cellForRowAtIndexPath（indexPath）
 
 let selectedCurrency = PortfolioCurrencyStore.sharedStore（）。allCurrencies [indexPath.row] 
 
如果selectedCurrency.symbol！= GlobalSettings.sharedStore（）。portfolioCurrency {
 
 //警告：更改投资组合货币将重置投资组合
 var resetWarning = UIAlertController（标题：NSLocalizedString（货币选择器VC：AS标题，评论：更改货币将重置投资组合），消息：nil，preferredStyle：.ActionSheet）
 
 //破坏性按钮
 let resetAction = UIAlertAction（标题：NSLocalizedString（货币选择器VC：AS破坏性，评论：破坏性按钮标题），样式：.Destructive，handler：{（action ：UIAlertAction！）in 
 
 //从上一页删除复选标记标记为单元格
 previousSelectedCell？.accessoryType = .None 
 
 //为所选单元格添加复选标记
 selectedCell？.accessoryType = .Checkmark 
 self.checkedIndexPath = indexPath 
 
 //单元格的动画取消选择
 self.tableView.deselectRowAtIndexPath（indexPath，animated：true）
 
 //将投资组合货币作为NSUserDefaults 
存货GlobalSettings.sharedStore（）。portfolioCurrency = selectedCurrency.symbol //将portfolioCurrency作为String链接，将currency.symbol作为Currency实例的属性进行链接。 
 
 //删除StockStore中的所有商品
 StockStore.sharedStore（）。removeAllStocks（）
 println（StockStore：所有条目都被删除）
 
 
 //重新加载tableView 
 self.tableView.reloadData（）
 
}）
 
 //取消按钮
 let cancelAction = UIAlertAction（标题：NSLocalizedString（货币选择器VC：AS取消，注释：取消按钮标题），样式：.Cancel，handler：nil）
 
 resetWarning.addAction（resetAction）
 resetWarning.addAction（cancelAction）
 
 presentViewController（resetWarning，animated：true，completion：nil）
 
} else {
 //取消选择单元格
 tableView.deselectRowAtIndexPath（indexPath，animated：true）
} 
} 
  

我错过了什么吗？

感谢您的帮助

解决方案

找到它！
如果此AlertController出现在一个popover中，它必须提供位置信息，sourceView和sourceRect，或barButtonItem。

喜欢

  resetWarning.popoverPresentationController？.sourceView = selectedCell？.contentView 
 resetWarning.popoverPresentationController？.sourceRect = selectedCell ！.contentView.frame 
  

我的代码必须如此：

 覆盖func tableView（tableView：UITableView，didSelectRowAtIndexPath indexPath：NSIndexPath）{
 
 var previousSelectedCell：UITableViewCell？ 
 if checkedIndexPath！= nil {
 previousSelectedCell = tableView.cellForRowAtIndexPath（checkedIndexPath）
} 
 var selectedCell = tableView.cellForRowAtIndexPath（indexPath）
 
 let selectedCurrency = PortfolioCurrencyStore.sharedStore.allCurrencies [indexPath.row] 
 
 if selectedCurrency.symbol！= GlobalSettings.sharedStore.portfolioCurrency {
 
 //警告：更改投资组合货币将重置组合
 var resetWarning = UIAlertController（标题：NSLocalizedString（货币选择器VC：AS标题，评论：更改货币将重置投资组合），消息：nil，preferredStyle：.ActionSheet）
 
 //破坏性按钮
 let resetAction = UIAlertAction（标题：NSLocalizedString（货币选择器VC：AS破坏性，评论：破坏性按钮标题），样式：。破坏性，处理程序：{（动作：UIAlertAction！） in 
 
 //删除previousl的复选标记y标记单元格
 previousSelectedCell？.accessoryType = .None 
 
 //为所选单元格添加复选标记
 selectedCell？.accessoryType = .Checkmark 
 self.checkedIndexPath = indexPath 
 
 //单元格的动画取消选择
 self.tableView.deselectRowAtIndexPath（indexPath，animated：true）
 
 //将投资组合货币作为NSUserDefaults 
存货GlobalSettings.sharedStore.portfolioCurrency = selectedCurrency.symbol //将portfolioCurrency作为String链接，将currency.symbol作为Currency实例的属性进行链接。 
 
 //删除StockStore中的所有商品
 StockStore.sharedStore.removeAllStocks（）
 println（StockStore：所有条目都被删除）
 
 //从CurrencyRateStore中删除所有项目
 CurrencyRateStore.sharedStore.deleteAllRates（）
 println（CurrencyStore：删除所有条目）
 
 //从SalesJournal中删除所有项目
 SalesJournal.sharedStore.removeAllEntries（）
 println（SalesJournal：所有销售日记帐分录都已删除）
 
 
 //重新加载tableView 
 self。 tableView.reloadData（）
 
 //在普通尺寸上，货币选择器显示在一个弹出框内：列表视图的reloadData 
 NSNotificationCenter.defaultCenter（）。postNotificationName（CurrencyPickerVC_PortfolioCurrencyDidChangeNotification，对象：nil，userInfo：nil）
 
 / / Animate取消选择单元格
 tableView.deselectRowAtIndexPath（indexPath，animated：true）
 
 //返回根目录VC 
 self.navigationController？.popToRootViewControllerAnimated（true）
 
}）
 
 
 
 //取消按钮
让cancelAction = UIAlertAction（标题：NSLocalizedString（货币选择器VC：AS取消，评论： 取消按钮标题），样式：。取消，处理程序：{（alertAction：UIAlertAction！） - >无效
 // Animate取消选择单元
 self.tableView.deselectRowAtIndexPath（indexPath，animated：true）
}）
 
 resetWarning.addAction（resetAction）
 resetWarning.addAction（cancelAction）
 
 //如果此AlertController出现在弹出窗口内，它必须提供位置信息，sourceView和sourceRect或barButtonItem。 
 resetWarning.popoverPresentationController？.sourceView = selectedCell？.contentView 
 resetWarning.popoverPresentationController？.sourceRect = selectedCell！.contentView.frame 
 
 presentViewController（resetWarning，animated：true，completion： nil）
 
 
} else {
 // Animate取消选择单元
 tableView.deselectRowAtIndexPath（indexPath，animated：true）
} 
 } 
  

现在图片如下所示：

I set a UITableViewController to be displayed in a popover on iPad :

When I click on a row, I display an alert to warn the user of a potential destructive action. I used the new UIAlertController, and here is what happens:

The popover becomes very small (the size of the alertController view in fact). If I press Cancel, I can see the result :

Here is my code:

override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

    var previouslySelectedCell: UITableViewCell?
    if checkedIndexPath != nil {
        previouslySelectedCell = tableView.cellForRowAtIndexPath(checkedIndexPath)
    }
    var selectedCell = tableView.cellForRowAtIndexPath(indexPath)

    let selectedCurrency = PortfolioCurrencyStore.sharedStore().allCurrencies[indexPath.row]

    if selectedCurrency.symbol != GlobalSettings.sharedStore().portfolioCurrency {

        // Warning : changing the portfolio currency will reset the portfolio
        var resetWarning = UIAlertController(title: NSLocalizedString("Currency Picker VC:AS title", comment: "Changing currency will reset portfolio"), message: nil, preferredStyle: .ActionSheet)

        // destructive button
        let resetAction = UIAlertAction(title: NSLocalizedString("Currency Picker VC:AS destructive", comment: "Destructive button title"), style: .Destructive, handler: { (action: UIAlertAction!) in

            // Remove checkmark from the previously marked cell
            previouslySelectedCell?.accessoryType = .None

            // Add checkmark to the selected cell
            selectedCell?.accessoryType = .Checkmark
            self.checkedIndexPath = indexPath

            // Animate deselection of cell
            self.tableView.deselectRowAtIndexPath(indexPath, animated:true)

            // Stock the portfolio currency as NSUserDefaults
            GlobalSettings.sharedStore().portfolioCurrency = selectedCurrency.symbol // link between portfolioCurrency as a String and currency.symbol as the property of a Currency instance.

            // Delete all items from the StockStore
            StockStore.sharedStore().removeAllStocks()
            println("StockStore : all entries were deleted")


            // Reload tableView
            self.tableView.reloadData()

            })

        // cancel button
        let cancelAction = UIAlertAction(title: NSLocalizedString("Currency Picker VC:AS cancel", comment: "Cancel button title"), style: .Cancel, handler:nil)

        resetWarning.addAction(resetAction)
        resetWarning.addAction(cancelAction)

        presentViewController(resetWarning, animated: true, completion: nil)

    } else {
        // Animate deselection of cell
        tableView.deselectRowAtIndexPath(indexPath, animated:true)
    }
}

Did I miss something ?

Thanks for your help

解决方案

Found it ! If this AlertController is presented inside a popover, it must provide the location information, either a sourceView and sourceRect, or a barButtonItem.

Like

resetWarning.popoverPresentationController?.sourceView = selectedCell?.contentView
resetWarning.popoverPresentationController?.sourceRect = selectedCell!.contentView.frame

My code had to look like that:

    override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

    var previouslySelectedCell: UITableViewCell?
    if checkedIndexPath != nil {
        previouslySelectedCell = tableView.cellForRowAtIndexPath(checkedIndexPath)
    }
    var selectedCell = tableView.cellForRowAtIndexPath(indexPath)

    let selectedCurrency = PortfolioCurrencyStore.sharedStore.allCurrencies[indexPath.row]

    if selectedCurrency.symbol != GlobalSettings.sharedStore.portfolioCurrency {

        // Warning : changing the portfolio currency will reset the portfolio
        var resetWarning = UIAlertController(title: NSLocalizedString("Currency Picker VC:AS title", comment: "Changing currency will reset portfolio"), message: nil, preferredStyle: .ActionSheet)

        // destructive button
        let resetAction = UIAlertAction(title: NSLocalizedString("Currency Picker VC:AS destructive", comment: "Destructive button title"), style: .Destructive, handler: { (action: UIAlertAction!) in

            // Remove checkmark from the previously marked cell
            previouslySelectedCell?.accessoryType = .None

            // Add checkmark to the selected cell
            selectedCell?.accessoryType = .Checkmark
            self.checkedIndexPath = indexPath

            // Animate deselection of cell
            self.tableView.deselectRowAtIndexPath(indexPath, animated:true)

            // Stock the portfolio currency as NSUserDefaults
            GlobalSettings.sharedStore.portfolioCurrency = selectedCurrency.symbol // link between portfolioCurrency as a String and currency.symbol as the property of a Currency instance.

            // Delete all items from the StockStore
            StockStore.sharedStore.removeAllStocks()
            println("StockStore : all entries were deleted")

            // Delete all items from the CurrencyRateStore
            CurrencyRateStore.sharedStore.deleteAllRates()
            println("CurrencyStore : all entries were deleted")

            // Delete all items from the SalesJournal
            SalesJournal.sharedStore.removeAllEntries()
            println("SalesJournal : all Sales journal entries were deleted")


            // Reload tableView
            self.tableView.reloadData()

            // On Regular sizes, the currency picker is presented inside a popover : reloadData of the List View
            NSNotificationCenter.defaultCenter().postNotificationName("CurrencyPickerVC_PortfolioCurrencyDidChangeNotification", object:nil, userInfo:nil)

            // Animate deselection of cell
            tableView.deselectRowAtIndexPath(indexPath, animated:true)

            // Return to root VC
            self.navigationController?.popToRootViewControllerAnimated(true)

            })



        // cancel button
        let cancelAction = UIAlertAction(title: NSLocalizedString("Currency Picker VC:AS cancel", comment: "Cancel button title"), style: .Cancel, handler: { (alertAction: UIAlertAction!) -> Void in
            // Animate deselection of cell
            self.tableView.deselectRowAtIndexPath(indexPath, animated:true)
        })

        resetWarning.addAction(resetAction)
        resetWarning.addAction(cancelAction)

        // If this AlertController is presented inside a popover, it must provide the location information, either a sourceView and sourceRect or a barButtonItem.
        resetWarning.popoverPresentationController?.sourceView = selectedCell?.contentView
        resetWarning.popoverPresentationController?.sourceRect = selectedCell!.contentView.frame

        presentViewController(resetWarning, animated: true, completion: nil)


    } else {
        // Animate deselection of cell
        tableView.deselectRowAtIndexPath(indexPath, animated:true)
    }
}

Now the image looks like this:

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