将文本传递到RaisedButton OnTap-Flutter

Question

      body: new Container(
          padding: EdgeInsets.all(14.0),
          child: Column(
              mainAxisAlignment: MainAxisAlignment.start,
              children: <Widget>[
                Row(
                  //Start of the 1st Row
                    mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                    children: <Widget>[
                      // Button 0 in 1st Row
                      RaisedButton(
                        padding: const EdgeInsets.all(20.0),
                        onPressed: () {
                          _button0();
                        },
                        child: new Text(_mBoard[0],
                            textAlign: TextAlign.center,
                            style: new TextStyle(
                              fontWeight: FontWeight.bold,
                              fontSize: 40.0,
                              fontFamily: 'Roboto',
                            )),
                        color: Colors.grey[300],
                      ),

  void _button0() {
    setState(() {
      if (_mBoard[0] == humanPlayer || _mBoard[0] == computerPlayer) {
        return;
      } else if (win == 0) {
        if (turn == 0) {
          _mBoard[0] = humanPlayer;
          _text = humanPlayer + " MOVED, O's TURN";
          turn = 1;
          win = checkWinner();
          checkGameOver(win);
          displayBoard();
        }
        if ((turn == 1) && (win == 0)) {
          turn = 0;
          computerTurn();
          win = checkWinner();
          checkGameOver(win);
          displayBoard();
        }
      }
    });
  }

打印板到控制台：

void displayBoard() {
  print(_mBoard[0] + " | " + _mBoard[1] + " | " + _mBoard[2]);
  print("-----------");
  print(_mBoard[3] + " | " + _mBoard[4] + " | " + _mBoard[5]);
  print("-----------");
  print(_mBoard[6] + " | " + _mBoard[7] + " | " + _mBoard[8]);
}

我希望用户对RaisedButton的选择显示一个“X”，而计算机的选择显示一个“O”。

Answer 1

在setState（）中包含了where_mboard值更新的部分和displayBoard（）方法。一旦调用setState()，它将通知StatefulWidget更新视图。但是您在setState内调用displayBoard()，而且这个方法还没有updated mboard值。

有两种方法可以解决这个问题，

>

将_mboard作为参数传递给displayBoard(_mboard)，这样它将访问本地_mboard值而不是状态值。