json - 如何为函数创建一个循环，直到布尔为真？

Question

我有一个使用url从firebase存储中获取一些信息的函数，这些信息包含一个布尔值，我想要实现的是true在这个JSON文件中的每个嵌套对象中循环一个值，并在它找到一个真实值时停止。

代码：

Future getAya() async {
    await checkInternet();
    await down_data();
    if (khatma == 'Khatma 1') {
      var rng = new Random();
      int ranum = rng.nextInt(2);
      var response = await http.get(
        'firebase link',
      );
      var myDataString = utf8.decode(response.bodyBytes);
      data = jsonDecode(myDataString);
      if (state = true) {
        print('Taken');
      } else {
        setState(() {
          ranAya = data['verse_$ranum']['Aya'];
          state = data['verse_$ranum']['taken'];
          audioLink = data['verse_$ranum']['audioLink'];
        });
      }

Answer 1

您可以do while像这样使用循环：

 Future getAya() async {
  bool state = false;

  do{
    await checkInternet();
    await down_data();
    if (khatma == 'Khatma 1') {
      var rng = new Random();
      int ranum = rng.nextInt(2);
      var response = await http.get(
        'firebase link',
      );
      var myDataString = utf8.decode(response.bodyBytes);
      data = jsonDecode(myDataString);
      state = data['verse_$ranum']['taken'];

      if (state) {
        print('Taken');
      } else {
        setState(() {
          ranAya = data['verse_$ranum']['Aya'];
          audioLink = data['verse_$ranum']['audioLink'];
        });
      }
    }
  }while(!state);
}