blocks|key|397974|text|简单地将textfield对象与空字符串""进行比较并不是正确的方法。您必须比较textfield的text属性，因为它是一个兼容的类型，并保存您正在寻找的信息。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|397975|@IBAction+func+Button(sender:+AnyObject)+{
++++if+textField1.text+==+""+%7C%7C+textField2.text+==+""+{
++++++++//+either+textfield+1+or+2's+text+is+empty
++++}
}|code-block|syntax|javascript|397976|SWIFT2.0：|BOLD|397977|警卫|397978|guard+let+text+=+descriptionLabel.text+where+!text.isEmpty+else+{
++++return
}
text.characters.count++//do+something+if+it's+not+empty|397979|if|397980|if+let+text+=+descriptionLabel.text+where+!text.isEmpty
{
++++//do+something+if+it's+not+empty++
++++text.characters.count++
}|397981|Swift+3.0:|397982|397983|guard+let+text+=+descriptionLabel.text,+!text.isEmpty+else+{
++++return
}
text.characters.count++//do+something+if+it's+not+empty|397984|397985|if+let+text+=+descriptionLabel.text,+!text.isEmpty
{
++++//do+something+if+it's+not+empty++
++++text.characters.count++
}|397986|entityMap^0|K|2|1E|4|0|0|0|9|0|0|2|0|0|0|2|0|0|0|A|0|0|2|0|0|0|2|0|0^^$0|@$1|2|3|4|5|6|7|15|8|@$9|16|A|17|B|C]|$9|18|A|19|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|1A|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1B|8|@$9|1C|A|1D|B|M]]|D|@]|E|$]]|$1|N|3|O|5|6|7|1E|8|@$9|1F|A|1G|B|M]]|D|@]|E|$]]|$1|P|3|Q|5|H|7|1H|8|@]|D|@]|E|$I|J]]|$1|R|3|S|5|6|7|1I|8|@$9|1J|A|1K|B|M]]|D|@]|E|$]]|$1|T|3|U|5|H|7|1L|8|@]|D|@]|E|$I|J]]|$1|V|3|W|5|6|7|1M|8|@$9|1N|A|1O|B|M]]|D|@]|E|$]]|$1|X|3|O|5|6|7|1P|8|@$9|1Q|A|1R|B|M]]|D|@]|E|$]]|$1|Y|3|Z|5|H|7|1S|8|@]|D|@]|E|$I|J]]|$1|10|3|S|5|6|7|1T|8|@$9|1U|A|1V|B|M]]|D|@]|E|$]]|$1|11|3|12|5|H|7|1W|8|@]|D|@]|E|$I|J]]|$1|13|3|-4|5|6|7|1X|8|@]|D|@]|E|$]]]|14|$]]

Simply comparing the textfield object to the empty string <code>""</code> is not the right way to go about this. You have to compare the textfield's <code>text</code> property, as it is a compatible type and holds the information you are looking for.

<pre><code>@IBAction func Button(sender: AnyObject) {
 if textField1.text == "" || textField2.text == "" {
 // either textfield 1 or 2's text is empty
 }
}
</code></pre>

Swift 2.0: 

Guard:

<pre><code>guard let text = descriptionLabel.text where !text.isEmpty else {
 return
}
text.characters.count //do something if it's not empty
</code></pre>

if:

<pre><code>if let text = descriptionLabel.text where !text.isEmpty
{
 //do something if it's not empty 
 text.characters.count 
}
</code></pre>

Swift 3.0: 

Guard:

<pre><code>guard let text = descriptionLabel.text, !text.isEmpty else {
 return
}
text.characters.count //do something if it's not empty
</code></pre>

if:

<pre><code>if let text = descriptionLabel.text, !text.isEmpty
{
 //do something if it's not empty 
 text.characters.count 
}
</code></pre>

blocks|key|398016|text|更好更美的用途|type|unstyled|depth|inlineStyleRanges|entityRanges|data|398017|+@IBAction+func+Button(sender:+AnyObject)+{
++++if+textField1.text.isEmpty+%7C%7C+textField2.text.isEmpty+{

++++}
}|code-block|syntax|javascript|398018|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|$]]

Better and more beautiful use 

<pre><code> @IBAction func Button(sender: AnyObject) {
 if textField1.text.isEmpty || textField2.text.isEmpty {

 }
}
</code></pre>

blocks|key|2005378|text|也许我有点晚了，但我们不能这样检查吗？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2005379|+++@IBAction+func+Button(sender:+AnyObject)+{
+++++++if+textField1.text.utf16Count+==+0+%7C%7C+textField2.text.utf16Count+==+0+{

+++++++}
++++}|code-block|syntax|javascript|2005380|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|$]]

Maybe i'm a little too late, but can't we check like this:

<pre><code> @IBAction func Button(sender: AnyObject) {
 if textField1.text.utf16Count == 0 || textField2.text.utf16Count == 0 {

 }
 }
</code></pre>

blocks|key|398096|text|我只是尝试用简单的代码向您展示解决方案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|398097|@IBAction+func+Button(sender+:+AnyObject)+{
+if+textField1.text+!=+""+{
+++//+either+textfield+1+is+not+empty+then+do+this+task
+}else{
+++//show+error+here+that+textfield1+is+empty
+}
}|code-block|syntax|javascript|398098|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|$]]

I just tried to show you the solution in a simple code

<pre><code>@IBAction func Button(sender : AnyObject) {
 if textField1.text != "" {
 // either textfield 1 is not empty then do this task
 }else{
 //show error here that textfield1 is empty
 }
}
</code></pre>

blocks|key|398107|text|另一种签入实时textField源代码的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|398108|+@IBOutlet+var+textField1+:+UITextField+=+UITextField()

+override+func+viewDidLoad()+
+{
++++....
++++self.textField1.addTarget(self,+action:+Selector("yourNameFunction:"),+forControlEvents:+UIControlEvents.EditingChanged)
+}

+func+yourNameFunction(sender:+UITextField)+{

++++if+sender.text.isEmpty+{
++++++//+textfield+is+empty
++++}+else+{
++++++//+text+field+is+not+empty
++++}
++}|code-block|syntax|javascript|398109|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|$]]

another way to check in realtime textField source :

<pre><code> @IBOutlet var textField1 : UITextField = UITextField()

 override func viewDidLoad() 
 {
 ....
 self.textField1.addTarget(self, action: Selector("yourNameFunction:"), forControlEvents: UIControlEvents.EditingChanged)
 }

 func yourNameFunction(sender: UITextField) {

 if sender.text.isEmpty {
 // textfield is empty
 } else {
 // text field is not empty
 }
 }
</code></pre>

blocks|key|398132|text|一款适用于Swift+2/+Xcode+7的小型小型宝石|type|unstyled|depth|inlineStyleRanges|entityRanges|data|398133|@IBAction+func+SubmitAgeButton(sender:+AnyObject)+{

++++let+newAge+=+String(inputField.text!)++++++++

if+((textField.text?.isEmpty)+!=+false)+{
++++++++label.text+=+"Enter+a+number!"
++++}
++++else+{
++++++++label.text+=+"Oh,+you're+\(newAge)"

++++++++return
++++}

++++}|code-block|syntax|javascript|398134|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 compact little gem for Swift 2 / Xcode 7

<pre><code>@IBAction func SubmitAgeButton(sender: AnyObject) {

 let newAge = String(inputField.text!) 

if ((textField.text?.isEmpty) != false) {
 label.text = "Enter a number!"
 }
 else {
 label.text = "Oh, you're \(newAge)"

 return
 }

 }
</code></pre>

blocks|key|2005450|text|如果让..。在哪.{|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2005451|Swift+3|offset|length|style|BOLD|2005452|if+let+_text+=+theTextField.text,+_text.isEmpty+{
++++//+_text+is+not+empty+here
}|code-block|syntax|javascript|2005453|Swift+2|2005454|if+let+theText+=+theTextField.text+where+!theTextField.text!.isEmpty+{
++++//+theText+is+not+empty+here
}|2005455|守卫..。在哪里..。否则{|2005456|您还可以使用关键字guard：|CODE|2005457|Swift+3|2005458|guard+let+theText+=+theTextField.text+where+theText.isEmpty+else+{
++++//+theText+is+empty
++++return+//+or+throw
}

//+you+can+use+theText+outside+the+guard+scope+!
print("user+wrote+\(theText)")|2005459|Swift+2|2005460|guard+let+theText+=+theTextField.text+where+!theTextField.text!.isEmpty+else+{
++++//+the+text+is+empty
++++return
}

//+you+can+use+theText+outside+the+guard+scope+!
print("user+wrote+\(theText)")|2005461|这对于验证链来说尤其重要，例如在表单中。您可以为每个验证编写一个guard+let，并在出现关键错误时返回或抛出异常。|2005462|entityMap^0|0|0|7|0|0|0|7|0|0|0|9|5|0|0|7|0|0|0|7|0|0|W|9|0^^$0|@$1|2|3|4|5|6|7|17|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|18|8|@$D|19|E|1A|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|1B|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|1C|8|@$D|1D|E|1E|F|G]]|9|@]|A|$]]|$1|O|3|P|5|J|7|1F|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|1G|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1H|8|@$D|1I|E|1J|F|U]]|9|@]|A|$]]|$1|V|3|W|5|6|7|1K|8|@$D|1L|E|1M|F|G]]|9|@]|A|$]]|$1|X|3|Y|5|J|7|1N|8|@]|9|@]|A|$K|L]]|$1|Z|3|10|5|6|7|1O|8|@$D|1P|E|1Q|F|G]]|9|@]|A|$]]|$1|11|3|12|5|J|7|1R|8|@]|9|@]|A|$K|L]]|$1|13|3|14|5|6|7|1S|8|@$D|1T|E|1U|F|U]]|9|@]|A|$]]|$1|15|3|-4|5|6|7|1V|8|@]|9|@]|A|$]]]|16|$]]

<h2>if let ... where ... {</h2>

Swift 3:

<pre><code>if let _text = theTextField.text, _text.isEmpty {
 // _text is not empty here
}
</code></pre>

Swift 2:

<pre><code>if let theText = theTextField.text where !theTextField.text!.isEmpty {
 // theText is not empty here
}
</code></pre>

<h2>guard ... where ... else {</h2>

You can also use the keyword <code>guard</code> :

Swift 3:

<pre><code>guard let theText = theTextField.text where theText.isEmpty else {
 // theText is empty
 return // or throw
}

// you can use theText outside the guard scope !
print("user wrote \(theText)")
</code></pre>

Swift 2:

<pre><code>guard let theText = theTextField.text where !theTextField.text!.isEmpty else {
 // the text is empty
 return
}

// you can use theText outside the guard scope !
print("user wrote \(theText)")
</code></pre>

This is particularly great for validation chains, in forms for instance. You can write a <code>guard let</code> for each validation and return or throw an exception if there's a critical error.

blocks|key|34537|text|简单的检查方法|type|unstyled|depth|inlineStyleRanges|entityRanges|data|34538|if+TextField.stringValue.isEmpty+{

}|code-block|syntax|javascript|34539|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|$]]

Easy way to Check 

<pre><code>if TextField.stringValue.isEmpty {

}
</code></pre>

blocks|key|2005484|text|太晚了，它在Xcode+7.3.1中运行得很好。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2005485|if+_txtfield1.text!.isEmpty+%7C%7C+_txtfield2.text!.isEmpty+{
++++++++//is+empty
++++}|code-block|syntax|javascript|2005486|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|$]]

It's too late and its working fine in Xcode 7.3.1

<pre><code>if _txtfield1.text!.isEmpty || _txtfield2.text!.isEmpty {
 //is empty
 }
</code></pre>

blocks|key|2005529|text|好吧，这可能很晚了，但在Xcode+8中，我有一个解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2005530|if(textbox.stringValue.isEmpty)+{
++++//+some+code
}+else+{
++++//some+code
}|code-block|syntax|javascript|2005531|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|$]]

Okay, this might be late, but in Xcode 8 I have a solution:

<pre><code>if(textbox.stringValue.isEmpty) {
 // some code
} else {
 //some code
}
</code></pre>

blocks|key|34821|text|我使用了UIKeyInput内置的hasText：文档特性。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|34822|对于Swift+2.3，我不得不使用它作为方法而不是属性(因为它在文档中被引用)：|34823|if+textField1.hasText()+&&+textField2.hasText()+{
++++//+both+textfields+have+some+text
}|code-block|syntax|javascript|34824|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/reference/uikit/uikeyinput/1614457-hastext^0|4|A|H|7|P|2|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|F|3|G|5|6|7|12|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|13|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

I used <code>UIKeyInput</code>'s built in feature <code>hasText</code>: <a href="https://developer.apple.com/reference/uikit/uikeyinput/1614457-hastext" rel="nofollow noreferrer">docs</a>

For Swift 2.3 I had to use it as a method instead of a property (as it is referenced in the docs):

<pre><code>if textField1.hasText() &amp;&amp; textField2.hasText() {
 // both textfields have some text
}
</code></pre>

blocks|key|398338|text|现在，在Swive3/+xcode+8中，文本属性是可选的，您可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|398339|if+((textField.text+??+"").isEmpty)+{
++++//+is+empty
}|code-block|syntax|javascript|398340|或者：|398341|if+(textField.text?.isEmpty+??+true)+{
++++//+is+empty
}|398342|或者，您可以进行如下所示的扩展，并使用它：|398343|extension+UITextField+{
++++var+isEmpty:+Bool+{
++++++++return+text?.isEmpty+??+true
++++}
}

...

if+(textField.isEmpty)+{
++++//+is+empty
}|398344|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

As now in swift 3 / xcode 8 text property is optional you can do it like this:

<pre><code>if ((textField.text ?? "").isEmpty) {
 // is empty
}
</code></pre>

or:

<pre><code>if (textField.text?.isEmpty ?? true) {
 // is empty
}
</code></pre>

Alternatively you could make an extenstion such as below and use it instead:

<pre><code>extension UITextField {
 var isEmpty: Bool {
 return text?.isEmpty ?? true
 }
}

...

if (textField.isEmpty) {
 // is empty
}
</code></pre>

blocks|key|34833|text|Swift4.x解决方案|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|34834|@IBOutlet+var+yourTextField:+UITextField!

+override+func+viewDidLoad()+{
+++++....
+++++yourTextField.addTarget(self,+action:+#selector(actionTextFieldIsEditingChanged),+for:+UIControlEvents.editingChanged)
++}

+@objc+func+actionTextFieldIsEditingChanged(sender:+UITextField)+{
+++++if+sender.text.isEmpty+{
+++++++//+textfield+is+empty
+++++}+else+{
+++++++//+text+field+is+not+empty
+++++}
++}|code-block|syntax|javascript|34835|entityMap^0|4|8|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Swift 4.x Solution

<hr>

<pre><code>@IBOutlet var yourTextField: UITextField!

 override func viewDidLoad() {
 ....
 yourTextField.addTarget(self, action: #selector(actionTextFieldIsEditingChanged), for: UIControlEvents.editingChanged)
 }

 @objc func actionTextFieldIsEditingChanged(sender: UITextField) {
 if sender.text.isEmpty {
 // textfield is empty
 } else {
 // text field is not empty
 }
 }
</code></pre>

blocks|key|398368|text|Swift+4/xcode+9|type|unstyled|depth|inlineStyleRanges|entityRanges|data|398369|IBAction+func+button(_+sender:+UIButton)+{
++++++++if+(textField1.text?.isEmpty)!+%7C%7C+(textfield2.text?.isEmpty)!{
++++++++++++++++..............
++++++++}
}|code-block|syntax|javascript|398370|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|$]]

<h1>Swift 4/xcode 9</h1>
<pre><code>IBAction func button(_ sender: UIButton) {
 if (textField1.text?.isEmpty)! || (textfield2.text?.isEmpty)!{
 ..............
 }
}
</code></pre>

blocks|key|398427|text|Swift+4.2|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|398428|您可以为每个textField使用一个通用函数，只需在基本控制器中添加以下函数|398429|//+White+space+validation.
func+checkTextFieldIsNotEmpty(text:String)+->+Bool
{
++++if+(text.trimmingCharacters(in:+.whitespaces).isEmpty)
++++{
++++++++return+false

++++}else{
++++++++return+true
++++}
}|code-block|syntax|javascript|398430|entityMap^0|0|9|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

Swift 4.2

You can use a general function for your every textField just add the following function in your base controller

<pre><code>// White space validation.
func checkTextFieldIsNotEmpty(text:String) -&gt; Bool
{
 if (text.trimmingCharacters(in: .whitespaces).isEmpty)
 {
 return false

 }else{
 return true
 }
}
</code></pre>

blocks|key|398459|text|使用此扩展程序|type|unstyled|depth|inlineStyleRanges|entityRanges|data|398460|extension+String+{
++++func+isBlankOrEmpty()+->+Bool+{

++++++//+Check+empty+string
++++++if+self.isEmpty+{
++++++++++return+true
++++++}
++++++//+Trim+and+check+empty+string
++++++return+(self.trimmingCharacters(in:+.whitespaces)+==+"")
+++}
}|code-block|syntax|javascript|398461|就像这样|398462|//+Disable+the+Save+button+if+the+text+field+is+empty.
let+text+=+nameTextField.text+??+""
saveButton.isEnabled+=+!text.isBlankOrEmpty()|398463|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

use this extension 

<pre><code>extension String {
 func isBlankOrEmpty() -&gt; Bool {

 // Check empty string
 if self.isEmpty {
 return true
 }
 // Trim and check empty string
 return (self.trimmingCharacters(in: .whitespaces) == "")
 }
}
</code></pre>

like so 

<pre><code>// Disable the Save button if the text field is empty.
let text = nameTextField.text ?? ""
saveButton.isEnabled = !text.isBlankOrEmpty()
</code></pre>

I am working on the code below to check the <code>textField1</code> and <code>textField2</code> text fields whether there is any input in them or not. 

The <code>IF</code> statement is not doing anything when I press the button.

<pre><code> @IBOutlet var textField1 : UITextField = UITextField()
 @IBOutlet var textField2 : UITextField = UITextField()
 @IBAction func Button(sender : AnyObject) 
 {

 if textField1 == "" || textField2 == "" 
 {

 //then do something

 } 
 }
</code></pre>

How to check if a text field is empty or not 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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我正在编写下面的代码，以检查textField1和textField2文本字段中是否有任何输入。当我按下按钮时，IF语句不会做任何事情。 @IBOutlet var textField1 : UITextField = UITextField() @IBOutlet var textField2 : UITextFie...

问如何检查文本字段是否为空
EN

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问如何检查文本字段是否为空EN