blocks|key|1360964|text|使用文本字段的委托方法(或目标操作模式)检查用户继续操作所需的条件。如果满足这些条件，请启用该按钮。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1360965|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Use the textfield's delegate methods (or the target-action pattern) to check the conditions required for the user to proceed. If they're met, enable the button.

blocks|key|1667242|text|尽管到目前为止给出了所有的评论，为了不进一步破坏评论区，我试着给出一些关于如何解决你的问题的提示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1667243|1667244|将所有文本字段放在outlet集合中，并将所有文本字段的委托设置为您的viewController|unordered-list-item|1667245|implement委托委托的didEndEditing方法，并在该方法中迭代outlet集合以检查每个文本字段的输入|offset|length|style|CODE|1667246|1667247|请注意，这只是实现这一点的一种方法，但您可能会明白这一点。|1667248|entityMap^0|0|0|0|E|D|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|R|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|S|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|T|8|@$H|U|I|V|J|K]]|9|@]|A|$]]|$1|L|3|-4|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|P|$]]

Despite of all the comments given so far and to not blow up the comment area further, I try to give some hints on how to solve your problem:

<ul>
<li>Put all the textfields in an outlet collection</li>
<li>Set the delegate of all textfields to your viewController</li>
<li>implement the delegate's <code>didEndEditing</code> method and within that method iterate over the outlet collection to check each textfield for its input</li>
</ul>

Note that this is only ONE way to implement that but you might get the idea.

blocks|key|1667258|text|列出实现这一目标的方法之一：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1667259|class+ViewController:+UIViewController,+UITextFieldDelegate+{

++++@IBOutlet+weak+var+textField:+UITextField!
++++@IBOutlet+weak+var+button:+UIButton!

++++//Need+to+have+the+ViewController+extend+UITextFieldDelegate+for+using+this+feature
++++func+textField(textField:+UITextField,+shouldChangeCharactersInRange+range:+NSRange,+replacementString+string:+String)+->+Bool+{

++++++++//+Find+out+what+the+text+field+will+be+after+adding+the+current+edit
++++++++let+text+=+(textField.text+as+NSString).stringByReplacingCharactersInRange(range,+withString:+string)

++++++++if+!text.isEmpty{//Checking+if+the+input+field+is+not+empty
++++++++++++button.userInteractionEnabled+=+true+//Enabling+the+button
++++++++}+else+{
++++++++++++button.userInteractionEnabled+=+false+//Disabling+the+button
++++++++}

++++++++//+Return+true+so+the+text+field+will+be+changed
++++++++return+true
++++}

++++override+func+viewDidLoad()+{
++++++++super.viewDidLoad()
++++++++//+Do+any+additional+setup+after+loading+the+view,+typically+from+a+nib.

++++++++//Setting+the+Delegate+for+the+TextField
++++++++textField.delegate+=+self
++++++++//Default+checking+and+disabling+of+the+Button
++++++++if+textField.text.isEmpty{
++++++++++++button.userInteractionEnabled+=+false+//+Disabling+the+button
++++++++}
++++}
}|code-block|syntax|javascript|1667260|Reference+Link+for+the+above+solution|offset|length|1667261|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/26919854/how-can-i-declare-that-a-text-field-can-only-contain-an-integer/26942438#26942438^0|0|0|0|11|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]]]]

Listing one of the ways to achieve this:

<pre><code>class ViewController: UIViewController, UITextFieldDelegate {

 @IBOutlet weak var textField: UITextField!
 @IBOutlet weak var button: UIButton!

 //Need to have the ViewController extend UITextFieldDelegate for using this feature
 func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -&gt; Bool {

 // Find out what the text field will be after adding the current edit
 let text = (textField.text as NSString).stringByReplacingCharactersInRange(range, withString: string)

 if !text.isEmpty{//Checking if the input field is not empty
 button.userInteractionEnabled = true //Enabling the button
 } else {
 button.userInteractionEnabled = false //Disabling the button
 }

 // Return true so the text field will be changed
 return true
 }

 override func viewDidLoad() {
 super.viewDidLoad()
 // Do any additional setup after loading the view, typically from a nib.

 //Setting the Delegate for the TextField
 textField.delegate = self
 //Default checking and disabling of the Button
 if textField.text.isEmpty{
 button.userInteractionEnabled = false // Disabling the button
 }
 }
}
</code></pre>

<a href="https://stackoverflow.com/questions/26919854/how-can-i-declare-that-a-text-field-can-only-contain-an-integer/26942438#26942438">Reference Link for the above solution</a>

I need a way to disable the save button until text has been entered in all of the required text boxes? I am developing the application in Swift and I have found lots of answers in Objective-c. As I have absolutely now Objective-c knowledge, I am unable to work out what it means.

Does anybody have a solution for this which can be done in Swift?

I know how to enable/disable a button. I also know how to check if a text field is empty. I'm just not sure how to make it so that my code is always checking to see if it is empty or not. I have tried a while loop but as I expected, this froze everything.

How can I disable a button until text in all UITextFields has been entered in swift?

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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我需要一种方法来禁用保存按钮，直到所有必需的文本框中都输入了文本？我正在开发Swift中的应用程序，我已经在Objective-c中找到了很多答案。因为我现在完全掌握了Objective-c的知识，所以我无法弄清楚它的意思。有没有人有可以在Swift中完成的解决方案？我知道如何启用/禁用按钮。我还知道如何检查文本字段是...

问在swift中输入所有UITextFields中的文本之前，如何禁用按钮？
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问在swift中输入所有UITextFields中的文本之前，如何禁用按钮？EN