blocks|key|1232709|text|我认为您需要创建一个函数来检查特定的TextFormField行。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1232710|我想这对你很有用"https://stackoverflow.com/questions/45900387/multi-line-textfield-in-flutter“|offset|length|1232711|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/45900387/multi-line-textfield-in-flutter^0|0|9|24|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

I think you need to create a function to check the TextFormField specific line.
I think this an be useful for you &quot;https://stackoverflow.com/questions/45900387/multi-line-textfield-in-flutter&quot;

blocks|key|1210681|text|要在不按enter键的情况下更新高度：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1210682|onChanged:+(String+e)+{
++++int+sizeIncreaseConstant+=+30;+//the+fontSize+20+%2B+buffer
++++int+widthOfCharacter+=+17;+//+85%25+of+fontsize
++++int+newNumLines+=+((e.length+*+widthOfCharacter)/widthOfContainer).truncate();
++++if(+newNumLines+!=+numLines)+{
++++++++setState(()+{
++++++++++++if(newNumLines+>+numLines)+
++++++++++++++++heightOfContainer+=+heightOfContainer+%2B+sizeIncreaseConstant;
++++++++++++else
++++++++++++++++heightOfContainer+=+heightOfContainer+-+sizeIncreaseConstant;
++++++++++++numLines+=+newNumLines;
++++++++});
++++}
},|code-block|syntax|javascript|1210683|初始值：|1210684|int+numLines+=+0;
double+widthOfContainer+=+120;
double+heightOfContainer+=+50;
//fontSize+=+20;|1210685|为此，您必须对所有字符使用宽度相等的字体，如等宽字体。您还需要根据fontSize确定字符的宽度。它应该是50-60%25的字体大小，但85%25的工作为我。|1210686|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

To update height without pressing enter:
<pre><code>onChanged: (String e) {
 int sizeIncreaseConstant = 30; //the fontSize 20 + buffer
 int widthOfCharacter = 17; // 85% of fontsize
 int newNumLines = ((e.length * widthOfCharacter)/widthOfContainer).truncate();
 if( newNumLines != numLines) {
 setState(() {
 if(newNumLines &gt; numLines) 
 heightOfContainer = heightOfContainer + sizeIncreaseConstant;
 else
 heightOfContainer = heightOfContainer - sizeIncreaseConstant;
 numLines = newNumLines;
 });
 }
},
</code></pre>
initial values:
<pre><code>int numLines = 0;
double widthOfContainer = 120;
double heightOfContainer = 50;
//fontSize = 20;
</code></pre>
For this, you will have to use a font that has equal width for all characters like Monospace. And you will also need to determine the width of the character based on fontSize. It is supposed to be 50-60% of the font size but 85% worked for me.

I have a <code>Card</code> widget with <code>TextFormField</code> as a child. I want to increase the height of the card each time a user gets to a new line. The card is wrapped in a <code>Container</code> and I have a height variable to determine the height.
How can I detect new line in <code>TextFormField</code>? Also whenever the text wraps to the next line.

Detect new line in TextFormField - Flutter

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。

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我有一个将TextFormField作为孩子的Card小部件。我希望在用户每次到达新行时增加卡片的高度。卡片被包装在Container中，我有一个height变量来确定高度。如何在TextFormField中检测新行？此外，每当文本换行到下一行时。

问检测TextFormField中的新行- Flutter
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问检测TextFormField中的新行- FlutterEN