使用 UIAlertView 取消触摸

Question

我正在构建一个游戏。

该游戏具有UITableViewController，可用作设置和选项功能。

您可以选择的选项之一是将对手从传球切换到 AI(或相反)。

我想做的是使用 UIAlertController 来拦截触摸，检查正在进行的游戏，并提示用户取消更改或继续。

我已经实现了在override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath)函数中执行此操作的代码。

我的代码如下：

if indexPath.section == 1 {
// Here we need to detect a game in progress and ask for a confirmation before switching to another mode.
if getGameInProgress() == true {
// Display choice dialog
alert = UIAlertController (title: alertCaption, message: alertMessage, preferredStyle: .Alert)
let cancelAction: UIAlertAction = UIAlertAction(title: "Cancel", style: .Cancel, handler: {(action: UIAlertAction) -> Void in
self.alert.dismissViewControllerAnimated(true, completion: { _ in })
return
})
alert.addAction(cancelAction)
let ok: UIAlertAction = UIAlertAction(title: "Confirm", style: .Default, handler: {(action: UIAlertAction) -> Void in
self.alert.dismissViewControllerAnimated(true, completion: { _ in })
// Do nothing, just let the touch method continue...
})
alert.addAction(ok)
self.presentViewController (alert, animated: true, completion: nil)
}

if indexPath.row == 0 {
// "Pass and Play"
setOpponentPreference("Pass and Play")
}
if indexPath.row == 1 {
// "Virtual Robert"
setOpponentPreference("Virtual Robert")
}
if indexPath.row == 2 {
// "Virtual Nathan"
setOpponentPreference("Virtual Nathan")
}
// No matter which difficulty selected:
gameboard.setDifficulty()
// Create a method to reset the game, but without fading out the menu screen (the current new game method takes you directly to the game. The player may not want that in this instance.)
}

我遇到的问题是警报控制器显示并等待输入，但它不会阻止didSelectRowAtIndexPath函数形式的其余部分继续。

在处理单元格上的触摸之前，如何接收用户输入？

Answer 1

您好，您只需要将代码放在"确认"选项的完成部分中，只有当用户点击UIAlertViewController的"确认"按钮时，您的代码才会执行

self.alert.dismissViewControllerAnimated(true, completion: { _ in })
// Do nothing, just let the touch method continue...
})

所以你的代码必须是

if indexPath.section == 1 {
// Here we need to detect a game in progress and ask for a confirmation before switching to another mode.
if getGameInProgress() == true {
// Display choice dialog
alert = UIAlertController (title: alertCaption, message: alertMessage, preferredStyle: .Alert)
let cancelAction: UIAlertAction = UIAlertAction(title: "Cancel", style: .Cancel, handler: {(action: UIAlertAction) -> Void in
self.alert.dismissViewControllerAnimated(true, completion: { _ in })
return
})
alert.addAction(cancelAction)
let ok: UIAlertAction = UIAlertAction(title: "Confirm", style: .Default, handler: {(action: UIAlertAction) -> Void in
self.alert.dismissViewControllerAnimated(true, completion: { _ in })
if indexPath.row == 0 {
// "Pass and Play"
setOpponentPreference("Pass and Play")
}
if indexPath.row == 1 {
// "Virtual Robert"
setOpponentPreference("Virtual Robert")
}
if indexPath.row == 2 {
// "Virtual Nathan"
setOpponentPreference("Virtual Nathan")
}
// No matter which difficulty selected:
gameboard.setDifficulty()
// Create a method to reset the game, but without fading out the menu screen (the current new game method takes you directly to the game. The player may not want that in this instance.)
})
alert.addAction(ok)
self.presentViewController (alert, animated: true, completion: nil)
}
}

我希望这对你有所帮助，对我来说效果很好，问候

Answer 2

对不起，英语不好。我从您的问题中了解到的是，您希望按住程序以继续执行，直到用户从UIAlertController中选择其中一个按钮。

为此，您需要做的是在"确定"按钮或"取消"按钮的操作中执行任务。

if getGameInProgress() == true {
// Display choice dialog
alert = UIAlertController (title: alertCaption, message: alertMessage, preferredStyle: .Alert)
let cancelAction: UIAlertAction = UIAlertAction(title: "Cancel", style: .Cancel, handler: {(action: UIAlertAction) -> Void in
self.alert.dismissViewControllerAnimated(true, completion: { _ in })
return
})
alert.addAction(cancelAction)
let ok: UIAlertAction = UIAlertAction(title: "Confirm", style: .Default, handler: {(action: UIAlertAction) -> Void in
//Do something in here like print 
println("Confirm Button Pressed")

self.alert.dismissViewControllerAnimated(true, completion: { _ in })
// Do nothing, just let the touch method continue...
})
alert.addAction(ok)
self.presentViewController (alert, animated: true, completion: nil)
}

希望有帮助。