如何在迭代期间从列表中减去字符串值？扑

Question

我有一个小部件构造函数列表，它们是字符串，用于不同的 classes。该列表包含 39 个标签，这 39 个标签具有不同的文本，有些页面将只有 7 个标签，在迭代过程中我如何才能仅显示 class 显示为字符串的标签数量？

List<String> tests;
// @override
// void initState() {
// super.initState();     tests = [widget.label00, widget.label0]; }

  @override
  void initState() {
    super.initState();
    tests = [
      widget.label00,
      widget.label0,
      widget.label1,
      widget.label2,
      widget.label3,
      widget.label4,
      widget.label5,
      widget.label6,
      widget.label7,
      widget.label8,
      widget.label9,
      widget.label10,
      widget.label11,
      widget.label12,
      widget.label13,
      widget.label14,
      widget.label15,
      widget.label16,
      widget.label17,
      widget.label18,
      widget.label19,
      widget.label20,
      widget.label21,
      widget.label22,
      widget.label23,
      widget.label24,
      widget.label25,
      widget.label26,
      widget.label27,
      widget.label28,
      widget.label29,
      widget.label30,
      widget.label31,
      widget.label32,
      widget.label33,
      widget.label34,
      widget.label35,
      widget.label36,
      widget.label37,
      widget.label38,
      widget.label39
    ];

    // List<ReusableLarge> translationTextsss = [
    //   ReusableLarge(label00: "test00"),
    //   ReusableLarge(label0: "test0"),
    //   ReusableLarge(label1: 'test1'),
    //   ReusableLarge(label2: 'test2'),
    //   // ),
    // ];

    Timer.periodic(Duration(seconds: 5), (Timer timer) {
      if (widget.label7 == '') {
        setState(() {
          tests.length - 1;
        });

        if (_currentPage < tests.length) {
          _currentPage++;
        } else {
          _currentPage = 0;
        }

        _pageController.animateToPage(
          _currentPage,
          duration: Duration(milliseconds: 350),
          curve: Curves.easeIn,
        );
      }
    });
  }

和显示字符串的 classes 之一：我该怎么做才能让带有标签的卡片：''不显示？我试过 tests.length-1 但它显示了一条波浪线我希望 tests.length 根据该标签是否包含字符串而改变。

label00: 'Surah Fatiha' + '\n' + 'The Opening',
      label0: 'In the name of God, the Lord of Mercy, the Giver of Mercy!',
      label1: 'AYAH 1: Praise belongs to God, Lord of the Worlds,',
      label2: 'AYAH 2: the Lord of Mercy, the Giver of Mercy,',
      label3: 'AYAH 3: Master of the Day of Judgement.',
      label4: 'AYAH 4: It is You we worship; it is You we ask for help.',
      label5: 'AYAH 5: Guide us to the straight path:',
      label6:
          'AYAH 6: the path of those You have blessed, those who incur no anger and who have not gone astray.',
      label7: '',
      label8: 'label8',
      label9: '',
      label10: '',
      label11: '',
      label12: '',
      label13: '',
      label14: '',
      label15: '',
      label16: "",
      label17: '',
      label18: '',
      label19: '',
      label20: '',
      label21: '',
      label22: '',
      label23: '',
      label24: '',
      label25: '',
      label26: '',
      label27: "",
      label28: '',
      label29: '',
      label30: '',
      label31: '',
      label32: '',
      label33: '',
      label34: '',
      label35: '',
      label36: '',
      label37: '',
      label38: '',
      label39: '',

Answer 1

我能够通过一个包含所有小部件循环的列表并将其添加到另一个列表来克服这个障碍，这对我正在寻找的东西产生了奇迹：结果 = [];

for (int i = 0; i < tests.length; i++) {
  if (widget.label00 != '') {
    results.add(widget.label00);
  }
  if (widget.label0 != '') {
    results.add(widget.label0);
  }
  if (widget.label1 != '') {
    results.add(widget.label1);
  }
  if (widget.label2 != '') {
    results.add(widget.label2);
  }
  if (widget.label3 != '') {
    results.add(widget.label3);
  }
  if (widget.label4 != '') {
    results.add(widget.label4);
  }
  if (widget.label5 != '') {
    results.add(widget.label5);
  }
  if (widget.label6 != '') {
    results.add(widget.label6);
  }
  if (widget.label7 != '') {
    results.add(widget.label7);
  }
  if (widget.label8 != '') {
    results.add(widget.label8);
  }
  if (widget.label9 != '') {
    results.add(widget.label9);
  }
  if (widget.label10 != '') {
    results.add(widget.label10);
  }
  if (widget.label11 != '') {
    results.add(widget.label11);
  }
  if (widget.label12 != '') {
    results.add(widget.label12);
  }
  if (widget.label13 != '') {
    results.add(widget.label13);
  }
  if (widget.label14 != '') {
    results.add(widget.label14);
  }
  if (widget.label15 != '') {
    results.add(widget.label15);
  }
  if (widget.label16 != '') {
    results.add(widget.label16);
  }
  if (widget.label17 != '') {
    results.add(widget.label17);
  }
  if (widget.label18 != '') {
    results.add(widget.label18);
  }
  if (widget.label19 != '') {
    results.add(widget.label19);
  }
  if (widget.label20 != '') {
    results.add(widget.label20);
  }
  if (widget.label21 != '') {
    results.add(widget.label21);
  }
  if (widget.label22 != '') {
    results.add(widget.label22);
  }
  if (widget.label23 != '') {
    results.add(widget.label23);
  }
  if (widget.label24 != '') {
    results.add(widget.label24);
  }
  if (widget.label25 != '') {
    results.add(widget.label25);
  }

  if (widget.label26 != '') {
    results.add(widget.label26);
  }
  if (widget.label27 != '') {
    results.add(widget.label27);
  }
  if (widget.label28 != '') {
    results.add(widget.label28);
  }
  if (widget.label29 != '') {
    results.add(widget.label29);
  }
  if (widget.label30 != '') {
    results.add(widget.label30);
  }
  if (widget.label31 != '') {
    results.add(widget.label31);
  }
  if (widget.label32 != '') {
    results.add(widget.label32);
  }
  if (widget.label33 != '') {
    results.add(widget.label33);
  }
  if (widget.label34 != '') {
    results.add(widget.label34);
  }
  if (widget.label35 != '') {
    results.add(widget.label35);
  }
  if (widget.label36 != '') {
    results.add(widget.label36);
  }
  if (widget.label37 != '') {
    results.add(widget.label37);
  }

如何在迭代期间从列表中减去字符串值？扑

How to subtract a String Value from a List during Iteration? Flutter

constructor

list

widget

flutter

flutter-dependencies