blocks|key|4611046|text|我知道已经发布了一些评论来回答这个问题，但答案应该让解决方案变得明确。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4611047|@IBOutlet+var+newWordField:+UITextField
func+wordEntered(alert:+UIAlertAction!){
++++//+store+the+new+word
++++self.textView2.text+=+deletedString+%2B+"+"+%2B+self.newWordField.text
}
func+addTextField(textField:+UITextField!){
++++//+add+the+text+field+and+make+the+result+global
++++textField.placeholder+=+"Definition"
++++self.newWordField+=+textField
}

//+display+an+alert
let+newWordPrompt+=+UIAlertController(title:+"Enter+definition",+message:+"Trainging+the+machine!",+preferredStyle:+UIAlertControllerStyle.Alert)
newWordPrompt.addTextFieldWithConfigurationHandler(addTextField)
newWordPrompt.addAction(UIAlertAction(title:+"Cancel",+style:+UIAlertActionStyle.Default,+handler:+nil))
newWordPrompt.addAction(UIAlertAction(title:+"OK",+style:+UIAlertActionStyle.Default,+handler:+wordEntered))
presentViewController(newWordPrompt,+animated:+true,+completion:+nil)|code-block|syntax|javascript|4611048|这将显示一个提示，其中包含一个文本字段和两个操作按钮。完成后，它会读取文本字段。|4611049|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I know comments have been posted to answer the question, but an answer should make the solution explicit.

<pre><code>@IBOutlet var newWordField: UITextField
func wordEntered(alert: UIAlertAction!){
 // store the new word
 self.textView2.text = deletedString + " " + self.newWordField.text
}
func addTextField(textField: UITextField!){
 // add the text field and make the result global
 textField.placeholder = "Definition"
 self.newWordField = textField
}

// display an alert
let newWordPrompt = UIAlertController(title: "Enter definition", message: "Trainging the machine!", preferredStyle: UIAlertControllerStyle.Alert)
newWordPrompt.addTextFieldWithConfigurationHandler(addTextField)
newWordPrompt.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Default, handler: nil))
newWordPrompt.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: wordEntered))
presentViewController(newWordPrompt, animated: true, completion: nil)
</code></pre>

This displays a prompt with a text field and two action buttons. It reads the text field when done.

blocks|key|4611063|text|在你的闭包中这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4611064|let+tf+=+alert.textFields[0]+as+UITextField|code-block|syntax|javascript|4611065|Here+is+a+gist|offset|length|4611066|entityMap|0|LINK|mutability|MUTABLE|url|https://gist.github.com/genedelisa/9bf44469c7f40772f5d1^0|0|0|0|E|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

Do this inside your closure:

<pre><code>let tf = alert.textFields[0] as UITextField
</code></pre>

<a href="https://gist.github.com/genedelisa/9bf44469c7f40772f5d1" rel="noreferrer">Here is a gist</a>

blocks|key|104561|text|我已经写了一个blog+post来探索新的API。您只需在闭包中捕获一个局部变量，就可以运行了。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|104562|var+inputTextField:+UITextField?
let+passwordPrompt+=+UIAlertController(title:+"Enter+Password",+message:+"You+have+selected+to+enter+your+password.",+preferredStyle:+UIAlertControllerStyle.Alert)
passwordPrompt.addAction(UIAlertAction(title:+"Cancel",+style:+UIAlertActionStyle.Default,+handler:+nil))
passwordPrompt.addAction(UIAlertAction(title:+"OK",+style:+UIAlertActionStyle.Default,+handler:+{+(action)+->+Void+in
++++//+Now+do+whatever+you+want+with+inputTextField+(remember+to+unwrap+the+optional)
}))
passwordPrompt.addTextFieldWithConfigurationHandler({(textField:+UITextField!)+in
++++textField.placeholder+=+"Password"
++++textField.secureTextEntry+=+true
++++inputTextField+=+textField
+})

presentViewController(passwordPrompt,+animated:+true,+completion:+nil)|code-block|syntax|javascript|104563|这样就避免了在视图控制器上有一个不必要的属性。|104564|entityMap|0|LINK|mutability|MUTABLE|url|http://ashfurrow.com/blog/uialertviewcontroller-example^0|7|9|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

I've written up a <a href="http://ashfurrow.com/blog/uialertviewcontroller-example" rel="noreferrer">blog post</a> exploring the new API. You can just capture a local variable in the closure and you're good to go. 

<pre><code>var inputTextField: UITextField?
let passwordPrompt = UIAlertController(title: "Enter Password", message: "You have selected to enter your password.", preferredStyle: UIAlertControllerStyle.Alert)
passwordPrompt.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Default, handler: nil))
passwordPrompt.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: { (action) -&gt; Void in
 // Now do whatever you want with inputTextField (remember to unwrap the optional)
}))
passwordPrompt.addTextFieldWithConfigurationHandler({(textField: UITextField!) in
 textField.placeholder = "Password"
 textField.secureTextEntry = true
 inputTextField = textField
 })

presentViewController(passwordPrompt, animated: true, completion: nil)
</code></pre>

That way you avoid having an unnecessary property on your view controller.

blocks|key|104576|text|我将Ash+Furrow's+answer移植到了Swift+3。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|104577|++++var+inputTextField:+UITextField?
++++let+passwordPrompt+=+UIAlertController(title:+"Enter+Password",+message:+"You+have+selected+to+enter+your+password.",+preferredStyle:+UIAlertControllerStyle.alert)
++++passwordPrompt.addAction(UIAlertAction(title:+"Cancel",+style:+UIAlertActionStyle.default,+handler:+nil))
++++passwordPrompt.addAction(UIAlertAction(title:+"OK",+style:+UIAlertActionStyle.default,+handler:+{+(action)+->+Void+in
++++++++//+Now+do+whatever+you+want+with+inputTextField+(remember+to+unwrap+the+optional)
++++}))
++++passwordPrompt.addTextField(configurationHandler:+{(textField:+UITextField!)+in
++++++++textField.placeholder+=+"Password"
++++++++textField.isSecureTextEntry+=+true
++++++++inputTextField+=+textField
++++})

++++present(passwordPrompt,+animated:+true,+completion:+nil)|code-block|syntax|javascript|104578|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/25713688/211457^0|2|J|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

I ported <a href="https://stackoverflow.com/a/25713688/211457">Ash Furrow's answer</a> to Swift 3.

<pre><code> var inputTextField: UITextField?
 let passwordPrompt = UIAlertController(title: "Enter Password", message: "You have selected to enter your password.", preferredStyle: UIAlertControllerStyle.alert)
 passwordPrompt.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.default, handler: nil))
 passwordPrompt.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: { (action) -&gt; Void in
 // Now do whatever you want with inputTextField (remember to unwrap the optional)
 }))
 passwordPrompt.addTextField(configurationHandler: {(textField: UITextField!) in
 textField.placeholder = "Password"
 textField.isSecureTextEntry = true
 inputTextField = textField
 })

 present(passwordPrompt, animated: true, completion: nil)
</code></pre>

I've got a UIAlertController which is prompted to the user when they choose "Enter Password" on the TouchID screen. How do I recover the user's input after presenting this on screen?

<pre><code>let passwordPrompt = UIAlertController(title: "Enter Password", message: "You have selected to enter your passwod.", preferredStyle: UIAlertControllerStyle.Alert)
passwordPrompt.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Default, handler: nil))
passwordPrompt.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))

passwordPrompt.addTextFieldWithConfigurationHandler({(textField: UITextField!) in
 textField.placeholder = "Password"
 textField.secureTextEntry = true
 })

presentViewController(passwordPrompt, animated: true, completion: nil)
</code></pre>

I know the OK button should probably have a handler, but right now this code doesn't really do anything, but I want to display the output of the text field through a println. This is really just a test app for me to learn Swift and some new API stuff.

Access input from UIAlertController

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有一个密码，当用户在TouchID屏幕上选择"Enter UIAlertController“时，系统会提示用户输入密码。在屏幕上显示后，如何恢复用户的输入？let passwordPrompt = UIAlertController(title: "Enter Password", message: "You ha...

问访问来自UIAlertController的输入
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