How to select text in a Flutter TextField using code?

Jul 3, 2019#flutter30

AI Translation

This post is translated from Chinese into English through AI.View Original

AI-generated summary

To implement text selection in a Flutter app, first define a `TextEditingController` in the Page class: ```dart TextEditingController _content = new TextEditingController(); ``` Next, bind this controller to a `TextField`: ```dart TextField(controller: _content) ``` Finally, add a button to select text when pressed: ```dart new FlatButton(onPressed: () { _content.selection = TextSelection(baseOffset: 0, extentOffset: 2); }) ``` Here, `baseOffset` indicates the starting position and `extentOffset` indicates the ending position, selecting characters from index 0 to 2.

First, we need to define a TextEditingController in the Page's class

TextEditingController _content = new TextEditingController();

Then, bind the TextEditingController to the TextField

TextField(controller: _content)

Finally, place the code in the button

new FlatButton( onPressed: () { _content.selection = TextSelection(baseOffset: 0, extentOffset: 2); })

Note that baseOffset refers to the starting position, and extentOffset refers to the end

The code here selects from the 0th to the 2nd character, with the following effect