blocks|key|1027051|text|如果要清除textField或textView的文本，只需将text属性设置为空字符串即可。正如你的教训所暗示的：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1027052|重置方法只需清除nameField和lyricsView的文本--您可以通过将它们的每个文本属性设置为空字符串来做到这一点。|blockquote|1027053|重置方法应该是这样的：|1027054|@IBAction+func+reset(_+sender:+Any)+{
++++nameField.text+=+""
++++lyricsView.text+=+""
}|code-block|syntax|javascript|1027055|entityMap^0|U|4|0|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|U|8|@]|D|@]|E|$]]|$1|I|3|J|5|6|7|V|8|@]|D|@]|E|$]]|$1|K|3|L|5|M|7|W|8|@]|D|@]|E|$N|O]]|$1|P|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|Q|$]]

If you want to clear the text of a textField or a textView, just set the <code>text</code> property to an empty string. As your lesson hint:

<blockquote>
 The reset method simply needs to clear out the text of both the
 nameField and the lyricsView—you can do this by setting each of their
 text properties to an empty string.
</blockquote>

The reset method should like this:

<pre><code>@IBAction func reset(_ sender: Any) {
 nameField.text = ""
 lyricsView.text = ""
}
</code></pre>

blocks|key|2024368|text|将此添加到重置方法以删除内容：-|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2024369|+nameField.text+=+""
+lyricsView.text+=+""|code-block|syntax|javascript|2024370|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|$]]

ADD this to reset method to remove the content:-

<pre><code> nameField.text = ""
 lyricsView.text = ""
</code></pre>

blocks|key|2024506|text|当您在nameField中输入某些内容时，会在lyricsView中显示一些内容。因此，应该有一种方法来清除您输入的内容(以及显示的内容)。因此，重置功能(我猜它是绑定到一个按钮)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2024507|一旦点击，nameField和lyricsView中的文本就会消失。您可以通过将两者都赋值给一个名为空字符串(仅为两个双引号)来做到这一点：|2024508|let+anEmptyString+=+""|code-block|syntax|javascript|2024509|您需要将""分配给nameField和lyricsView文本属性。|2024510|entityMap^0|3|9|N|A|0|5|9|F|A|0|0|4|2|9|9|J|A|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@$9|W|A|X|B|C]|$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|11|8|@$9|12|A|13|B|C]|$9|14|A|15|B|C]|$9|16|A|17|B|C]]|D|@]|E|$]]|$1|O|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|P|$]]

When you enter something into <code>nameField</code> something shows up in your <code>lyricsView</code>. So, there should be a way to clear what you've entered (and what is displayed). Hence, the reset function (I guess it's bound to a button). 

Once you hit reset the text in <code>nameField</code> and <code>lyricsView</code> should disappear. You can do this by assigning both to something called an empty string, which is just two double-quotes:

<pre><code>let anEmptyString = ""
</code></pre>

You'd need to assign the <code>""</code> to the <code>nameField</code> and <code>lyricsView</code> text property.

blocks|key|1027125|text|要清除这些字段，我将使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1027126|@IBAction+func+reset(_+sender:+Any)+{
++++nameField?.text+=+""
++++lyricsView?.text+=+""
}|code-block|syntax|javascript|1027127|问号将安全地执行代码，即使出于某些原因，这些字段尚未加载，或已被释放或删除。|1027128|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|$]]

To clear those fields I'd use:

<pre><code>@IBAction func reset(_ sender: Any) {
 nameField?.text = ""
 lyricsView?.text = ""
}
</code></pre>

The question mark will safely execute the code even if, for some reasons, those fields are not loaded yet, or have been freed or removed.

Disclaimer: I am teaching myself Swift &amp; Xcode so my question is rather simple. 

I'm building a simple application to get started, which has a text field connected to a String output.

The lesson I'm on currently has an excerpt which reads:

"The reset method simply needs to clear out the text of both the nameField and the lyricsView—you can do this by setting each of their text properties to an empty string."

I understand this probably involves an if statement, but I think the explanation on this is rather poor.

Here's the viewcontroller:

class ViewController: UIViewController {

<pre><code>@IBOutlet weak var nameField: UITextField!

@IBOutlet weak var lyricsView: UITextView!

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

override func didReceiveMemoryWarning() {
 super.didReceiveMemoryWarning()
 // Dispose of any resources that can be recreated.
}


@IBAction func reset(_ sender: Any) {
}

@IBAction func displayLyrics(_ sender: Any) {
}
</code></pre>

}

Can someone explain what they mean by setting the properties of nameField and lyricsView to an empty string in order to reset?

Thanks!

Learning Swift & Xcode - @IBAction func reset for display if UITextField is empty

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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免责声明:我正在教自己Swift & Xcode，所以我的问题相当简单。我正在构建一个简单的应用程序来开始，它有一个文本字段连接到一个字符串输出。我现在上的课有一段节选，内容如下：“重置方法只需清除nameField和lyricsView的文本--您可以通过将它们的每个文本属性设置为空字符串来做到这一点。”我知道这可能...

问如果UITextField为空，学习Swift & Xcode - @IBAction重置以供显示
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