有没有办法在 Flutter 的文本字段中显示条形码值?

Is there a way to display the barcode value in a text field in Flutter?

What i want to achieve looks like this:

我在网上和 Whosebug 上查看了多个来源,许多来源显示我们可以通过使用凸起按钮在文本字段中显示值。

到目前为止,我设法使用条形码扫描仪进行了扫描,但扫描的条形码并没有像我希望的那样出现在文本字段中。

我的代码:

Container(
    child: TextField(
           controller: textController,
            decoration: InputDecoration(
            hintText: 'SKU',
                  ),
                ),
              ),Container(
                 width: 80,
                height: 30,
                child: RaisedButton(
                  child: Text('SCAN'),
                  onPressed: (){
                    setState(() {
                      scan();
                      barcode = textController.text;
                    });
                 },
                ),
              ),

初始化:

final textController = TextEditingController();
String barcode = "";

调用扫描器的代码:

Future scan() async {
try {
  String barcode = await BarcodeScanner.scan();
  setState(() => this.barcode = barcode);
} on PlatformException catch (e) {
  if (e.code == BarcodeScanner.CameraAccessDenied) {
    setState(() {
      this.barcode = 'The user did not grant the camera permission!';
    });
  } else {
    setState(() => this.barcode = 'Unknown error: $e');
  }
} on FormatException{
  setState(() => this.barcode = 'null (User returned using the "back"-button before scanning anything. Result)');
} catch (e) {
  setState(() => this.barcode = 'Unknown error: $e');
}}

textController.text = barcode

而不是

barcode = textController.text; 

在 RaisedButton