blocks|key|4611068|text|Xcode+6+(Beta+1)目前不支持未实现的协议方法/属性的自动完成(用于Swift)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4611069|您最好的选择是对尚未完全实现的协议执行<CMD>+-+click，以查看您遗漏了什么。|offset|length|style|CODE|4611070|entityMap^0|0|J|D|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

Xcode 6 (Beta 1) is not currently supporting autocomplete for non-implemented protocol methods/properties (for Swift).

Your best bet is to <code>&lt;CMD&gt; - click</code> on the protocol that isn't yet fully implemented to see what you're missing.

blocks|key|4611130|text|class+ViewController:+UIViewController,UITextFieldDelegate++//set+delegate+to+class+

@IBOutlet+var+txtValue:+UITextField+++++++++++++//create+a+textfile+variable+

override+func+viewDidLoad()+{
++++super.viewDidLoad()
++++txtValue.delegate+=+self++++++++++++++++++//set+delegate+to+textfile
}


func+textFieldDidBeginEditing(textField:+UITextField!)+{++++//delegate+method

}

func+textFieldShouldEndEditing(textField:+UITextField!)+->+Bool+{++//delegate+method
++++return+false
}

func+textFieldShouldReturn(textField:+UITextField!)+->+Bool+{+++//delegate+method
++textField.resignFirstResponder()

++++return+true
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4611131|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>class ViewController: UIViewController,UITextFieldDelegate //set delegate to class 

@IBOutlet var txtValue: UITextField //create a textfile variable 

override func viewDidLoad() {
 super.viewDidLoad()
 txtValue.delegate = self //set delegate to textfile
}


func textFieldDidBeginEditing(textField: UITextField!) { //delegate method

}

func textFieldShouldEndEditing(textField: UITextField!) -&gt; Bool { //delegate method
 return false
}

func textFieldShouldReturn(textField: UITextField!) -&gt; Bool { //delegate method
 textField.resignFirstResponder()

 return true
}
</code></pre>

blocks|key|4611270|text|Swift+3.0.1

+//+UITextField+Delegates
++++func+textFieldDidBeginEditing(_+textField:+UITextField)+{
++++}
++++func+textFieldDidEndEditing(_+textField:+UITextField)+{
++++}
++++func+textFieldShouldBeginEditing(_+textField:+UITextField)+->+Bool+{
++++++++return+true;
++++}
++++func+textFieldShouldClear(_+textField:+UITextField)+->+Bool+{
++++++++return+true;
++++}
++++func+textFieldShouldEndEditing(_+textField:+UITextField)+->+Bool+{
++++++++return+true;
++++}
++++func+textField(_+textField:+UITextField,+shouldChangeCharactersIn+range:+NSRange,+replacementString+string:+String)+->+Bool+{
++++++++return+true;
++++}
++++func+textFieldShouldReturn(_+textField:+UITextField)+->+Bool+{
++++++++textField.resignFirstResponder();
++++++++return+true;
++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4611271|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>Swift 3.0.1

 // UITextField Delegates
 func textFieldDidBeginEditing(_ textField: UITextField) {
 }
 func textFieldDidEndEditing(_ textField: UITextField) {
 }
 func textFieldShouldBeginEditing(_ textField: UITextField) -&gt; Bool {
 return true;
 }
 func textFieldShouldClear(_ textField: UITextField) -&gt; Bool {
 return true;
 }
 func textFieldShouldEndEditing(_ textField: UITextField) -&gt; Bool {
 return true;
 }
 func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -&gt; Bool {
 return true;
 }
 func textFieldShouldReturn(_ textField: UITextField) -&gt; Bool {
 textField.resignFirstResponder();
 return true;
 }
</code></pre>

blocks|key|104634|text|更快的是..。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|104635|@IBOutlet+weak+var+nameTF:+UITextField!+{+didSet+{+nameTF.delegate+=+self+}+}|code-block|syntax|javascript|104636|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

A bit more swifty is ...

<pre><code>@IBOutlet weak var nameTF: UITextField! { didSet { nameTF.delegate = self } }
</code></pre>

blocks|key|104770|text|在将Swift+3.1版与UITextFields的插座一起使用时，请务必标记这些更改。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|104771|import+UIKit

class+LoginViewController:+UIViewController,+UITextFieldDelegate+{
+@IBOutlet+var+txtUserID:+UITextField!
+@IBOutlet+var+txtPwd:+UITextField!
+override+func+viewDidLoad()+{
++++super.viewDidLoad()

++++txtUserID.delegate+=+self
++++txtPwd.delegate+=+self
+}
+//+UITextField+Delegates
++++func+textFieldDidBeginEditing(_+textField:+UITextField)+{
++++++++print("TextField+did+begin+editing+method+called")
++++}
++++func+textFieldDidEndEditing(_+textField:+UITextField)+{
++++++++print("TextField+did+end+editing+method+called\(textField.text!)")
++++}
++++func+textFieldShouldBeginEditing(_+textField:+UITextField)+->+Bool+{
++++++++print("TextField+should+begin+editing+method+called")
++++++++return+true;
++++}
++++func+textFieldShouldClear(_+textField:+UITextField)+->+Bool+{
++++++++print("TextField+should+clear+method+called")
++++++++return+true;
++++}
++++func+textFieldShouldEndEditing(_+textField:+UITextField)+->+Bool+{
++++++++print("TextField+should+end+editing+method+called")
++++++++return+true;
++++}
++++func+textField(_+textField:+UITextField,+shouldChangeCharactersIn+range:+NSRange,+replacementString+string:+String)+->+Bool+{
++++++++print("While+entering+the+characters+this+method+gets+called")
++++++++return+true;
++++}
++++func+textFieldShouldReturn(_+textField:+UITextField)+->+Bool+{
++++++++print("TextField+should+return+method+called")
++++++++textField.resignFirstResponder();
++++++++return+true;
++++}
}|code-block|syntax|javascript|104772|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

While using Swift Version 3.1 with the outlets of UITextFields, do mark the changes.

<pre><code>import UIKit

class LoginViewController: UIViewController, UITextFieldDelegate {
 @IBOutlet var txtUserID: UITextField!
 @IBOutlet var txtPwd: UITextField!
 override func viewDidLoad() {
 super.viewDidLoad()

 txtUserID.delegate = self
 txtPwd.delegate = self
 }
 // UITextField Delegates
 func textFieldDidBeginEditing(_ textField: UITextField) {
 print("TextField did begin editing method called")
 }
 func textFieldDidEndEditing(_ textField: UITextField) {
 print("TextField did end editing method called\(textField.text!)")
 }
 func textFieldShouldBeginEditing(_ textField: UITextField) -&gt; Bool {
 print("TextField should begin editing method called")
 return true;
 }
 func textFieldShouldClear(_ textField: UITextField) -&gt; Bool {
 print("TextField should clear method called")
 return true;
 }
 func textFieldShouldEndEditing(_ textField: UITextField) -&gt; Bool {
 print("TextField should end editing method called")
 return true;
 }
 func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -&gt; Bool {
 print("While entering the characters this method gets called")
 return true;
 }
 func textFieldShouldReturn(_ textField: UITextField) -&gt; Bool {
 print("TextField should return method called")
 textField.resignFirstResponder();
 return true;
 }
}
</code></pre>

blocks|key|4611257|text|//+MARK:-+>文本字段委派|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4611258|func+textFieldDidBeginEditing(textField:+UITextField)+{

++++print("TextField+did+begin+editing+method+called")
}

func+textFieldDidEndEditing(textField:+UITextField)+{

++++print("TextField+did+end+editing+method+called\(textField.text)")
}

func+textFieldShouldBeginEditing(textField:+UITextField)+->+Bool+{

++++print("TextField+should+begin+editing+method+called")
++++return+true;
}

func+textFieldShouldClear(textField:+UITextField)+->+Bool+{

++++print("TextField+should+clear+method+called")
++++return+true;
}

func+textFieldShouldEndEditing(textField:+UITextField)+->+Bool+{
++++print("TextField+should+end+editing+method+called")
++++return+true;
}


func+textField(textField:+UITextField,+shouldChangeCharactersInRange+range:+NSRange,+replacementString+string:+String)+->+Bool+{
++++print("While+entering+the+characters+this+method+gets+called")
++++return+true;
}


func+textFieldShouldReturn(textField:+UITextField)+->+Bool+{

++++print("TextField+should+return+method+called")
++++textField.resignFirstResponder();
++++return+true;
}|code-block|syntax|javascript|4611259|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

// MARK:- ---> Textfield Delegates

<pre><code>func textFieldDidBeginEditing(textField: UITextField) {

 print("TextField did begin editing method called")
}

func textFieldDidEndEditing(textField: UITextField) {

 print("TextField did end editing method called\(textField.text)")
}

func textFieldShouldBeginEditing(textField: UITextField) -&gt; Bool {

 print("TextField should begin editing method called")
 return true;
}

func textFieldShouldClear(textField: UITextField) -&gt; Bool {

 print("TextField should clear method called")
 return true;
}

func textFieldShouldEndEditing(textField: UITextField) -&gt; Bool {
 print("TextField should end editing method called")
 return true;
}


func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -&gt; Bool {
 print("While entering the characters this method gets called")
 return true;
}


func textFieldShouldReturn(textField: UITextField) -&gt; Bool {

 print("TextField should return method called")
 textField.resignFirstResponder();
 return true;
}
</code></pre>

blocks|key|104743|text|Swift+3|type|unstyled|depth|inlineStyleRanges|entityRanges|data|104744|+++@IBOutlet+weak+var+yourNameTextfield:+UITextField!+{
++++++++didSet+{
++++++++++++yourNameTextfield.delegate+=+self
++++++++}
++++}

extension+YourNameViewController:+UITextFieldDelegate+{
++++func+textFieldDidBeginEditing(_+textField:+UITextField)+{

++++}
++++func+textFieldDidEndEditing(_+textField:+UITextField)+{

++++}
++++func+textFieldShouldBeginEditing(_+textField:+UITextField)+->+Bool+{
++++++++return+true
++++}
++++func+textFieldShouldClear(_+textField:+UITextField)+->+Bool+{
++++++++return+true
++++}
++++func+textFieldShouldEndEditing(_+textField:+UITextField)+->+Bool+{
++++++++return+true
++++}
++++func+textField(_+textField:+UITextField,+shouldChangeCharactersIn+range:+NSRange,+replacementString+string:+String)+->+Bool+{
++++++++return+true
++++}
++++func+textFieldShouldReturn(_+textField:+UITextField)+->+Bool+{
++++++++textField.resignFirstResponder();
++++++++return+true
++++}
}|code-block|syntax|javascript|104745|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Swift 3

<pre><code> @IBOutlet weak var yourNameTextfield: UITextField! {
 didSet {
 yourNameTextfield.delegate = self
 }
 }

extension YourNameViewController: UITextFieldDelegate {
 func textFieldDidBeginEditing(_ textField: UITextField) {

 }
 func textFieldDidEndEditing(_ textField: UITextField) {

 }
 func textFieldShouldBeginEditing(_ textField: UITextField) -&gt; Bool {
 return true
 }
 func textFieldShouldClear(_ textField: UITextField) -&gt; Bool {
 return true
 }
 func textFieldShouldEndEditing(_ textField: UITextField) -&gt; Bool {
 return true
 }
 func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -&gt; Bool {
 return true
 }
 func textFieldShouldReturn(_ textField: UITextField) -&gt; Bool {
 textField.resignFirstResponder();
 return true
 }
}
</code></pre>

blocks|key|104584|text|我找到了一些变通的办法。只需转到文件检查器，在编辑文件时将类型设置为Objective-C即可。自动完成为您提供Swift选项。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|104585|只需在构建时将类型切换回Swift即可。|104586|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I found a little work-around. Just go to file inspector and set type to Objective-C while you are editing the file. Auto-completion presents you Swift options.

Just switch the type back to Swift when you build.

blocks|key|104788|text|Swift+4：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|104789|@IBOutlet+weak+var+yourNameTextField:+UITextField!+{
++++++++didSet+{
++++++++++++yourNameTextField.delegate+=+self
++++++++}
}


extension+YourNameViewController:+UITextFieldDelegate+{
++++func+textFieldShouldReturn(_+textField:+UITextField)+->+Bool+{
++++++++switch+textField+{
++++++++case+yourNameTextField:
++++++++++++yourNameTextField.resignFirstResponder()
++++++++default:
++++++++++++break
++++++++}
++++++++return+true
++++}

++++func+textFieldShouldEndEditing(_+textField:+UITextField)+->+Bool+{
++++++++return+true
++++}
}|code-block|syntax|javascript|104790|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Swift 4:

<pre><code>@IBOutlet weak var yourNameTextField: UITextField! {
 didSet {
 yourNameTextField.delegate = self
 }
}


extension YourNameViewController: UITextFieldDelegate {
 func textFieldShouldReturn(_ textField: UITextField) -&gt; Bool {
 switch textField {
 case yourNameTextField:
 yourNameTextField.resignFirstResponder()
 default:
 break
 }
 return true
 }

 func textFieldShouldEndEditing(_ textField: UITextField) -&gt; Bool {
 return true
 }
}
</code></pre>

blocks|key|104818|text|我花了一个漫长的夜晚试图解决这个问题，问题是我的同事用textFieldShouldBeginEditing而不是textFieldDidBeginEditing实现了所有的逻辑，有时当我在TextFields之间使用first+responder时，textFieldShouldBeginEditing不会被调用。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|104819|entityMap^0|R|R|1L|O|3I|R|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

I spent a long night trying to fix this and the problem was that my coworker implemented all the logic in <code>textFieldShouldBeginEditing</code> instead of <code>textFieldDidBeginEditing</code> and sometimes <code>textFieldShouldBeginEditing</code> was not called when I used the first responder between TextFields ...

blocks|key|104613|text|在我的例子中，我错误地在swift中添加了类实现的作用域之外的委托方法，这限制了要调用的委托方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|104614|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|$]]

In my case by mistake I have added the delegate methods outside of the scope of the class implementation in swift and that restricts the delegate methods to be called.

blocks|key|4611231|text|我错误地在手势语句中添加了一个分号，该语句负责调用view.endEditing(true)，而后者又调用textFieldShouldBeginEditing等委托方法。有趣的swift不会显示任何编译时或运行时错误，有时添加分号，删除分号后，一切正常。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4611232|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|$]]

I had a semicolon by mistake add to the gesture statement, which was responsible for calling view.endEditing(true) which in turns calls the delegate methods such as textFieldShouldBeginEditing. Interesting swift does not show any compile time or run time errors for semicolons added sometimes, After removing the semicolon everything just works fine.

I have my ViewController class which implements UITextFieldDelegate. I have no auto complete for the funcs such as textFieldShouldBeginEditing. Is this a bug in XCode 6? Here's my class implementation.

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

Implementing UITextFieldDelegate with Swift

Objective-C

Swift

Xcode

我有一个实现UITextFieldDelegate的ViewController类。我没有像textFieldShouldBeginEditing这样的函数自动补全。这是XCode 6中的错误吗？这是我的类实现。class ViewController: UIViewController, UITextFieldDelegate

问使用Swift实施UITextFieldDelegate
EN

回答 12

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问使用Swift实施UITextFieldDelegateEN

回答 12

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问使用Swift实施UITextFieldDelegate
EN