Flutter中 輸入控件TextField設定内容并保持光标在末尾

TextEditingController controller = TextEditingController.fromValue(TextEditingValue(
      // 設定内容
        text: startWeight,
        // 保持光标在最後
        selection: TextSelection.fromPosition(TextPosition(
            affinity: TextAffinity.downstream,
            offset: startWeight.length)))
    );
           

TextFild設定controller

child: TextField(
              controller: controller,
       )