Question

我正在学习有关Udemy的Flutter课程，但我不明白如何解决此问题。

代码：

      body: Column(
    crossAxisAlignment: CrossAxisAlignment.stretch,
    children: <Widget>[
      Expanded(
          child: Row(
        children: <Widget>[
          Expanded(
            child: ReusableCard(
              onPress: () {
                setState(() {
                  selectedGender = Gender.male;
                });
              },
              colour: selectedGender == Gender.male
                  ? kActiveCardColour
                  : kInactiveCardColour,
              cardChild: IconContent(
                icon: FontAwesomeIcons.mars,
                label: 'MALE',
              ),
            ),
          ),
          Expanded(
            child: ReusableCard(
              onPress: () {
                setState(() {
                  selectedGender = Gender.female;
                });
              },
              colour: selectedGender == Gender.female
                  ? kActiveCardColour
                  : kInactiveCardColour,
              cardChild: IconContent(
                icon: FontAwesomeIcons.venus,
                label: 'FEMALE',
              ),
            ),
          ),
        ],
      )),
      Expanded(
        child: ReusableCard(
          colour: kActiveCardColour,
          cardChild: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              Text(
                'HEIGHT',
                style: kLabelTextStyle,
              ),
              Row(
                mainAxisAlignment: MainAxisAlignment.center,
                crossAxisAlignment: CrossAxisAlignment.baseline,
                textBaseline: TextBaseline.alphabetic,
                children: <Widget>[
                  Text(
                    height.toString(),
                    style: kNumberTextStyle,
                  ),
                  Text(
                    'cm',
                    style: kLabelTextStyle,
                  )
                ],
              ),
              SliderTheme(
                data: SliderTheme.of(context).copyWith(
                  inactiveTrackColor: Color(0xFF8D8E98),
                  activeTrackColor: Colors.white,
                  thumbColor: Color(0xFFEB1555),
                  overlayColor: Color(0x29EB1555),
                  thumbShape:
                      RoundSliderThumbShape(enabledThumbRadius: 15.0),
                  overlayShape:
                      RoundSliderOverlayShape(overlayRadius: 30.0),
                ),
                child: Slider(
                  value: height.toDouble(),
                  min: 120.0,
                  max: 220.0,
                  onChanged: (double newValue) {
                    setState(() {
                      height = newValue.round();
                    });
                  },
                ),
              ),
            ],
          ),
        ),
      ),
      Expanded(
        child: Row(
          children: <Widget>[
            Expanded(
              child: ReusableCard(
                colour: kActiveCardColour,
                cardChild: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: <Widget>[
                    Text(
                      'WEIGHT',
                      style: kLabelTextStyle,
                    ),
                    Text(
                      weight.toString(),
                      style: kNumberTextStyle,
                    ),
                    Row(
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: <Widget>[
                        RoundIconButton(
                            icon: FontAwesomeIcons.minus,
                            onPressed: () {
                              setState(() {
                                weight--;
                              });
                            }),
                        SizedBox(
                          width: 10.0,
                        ),
                        RoundIconButton(
                          icon: FontAwesomeIcons.plus,
                          onPressed: () {
                            setState(() {
                              weight++;
                            });
                          },
                        ),
                      ],
                    ),
                  ],
                ),
              ),
            ),
            Expanded(
              child: ReusableCard(
                colour: kActiveCardColour,
                cardChild: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: <Widget>[
                    Text(
                      'AGE',
                      style: kLabelTextStyle,
                    ),
                    Text(
                      age.toString(),
                      style: kNumberTextStyle,
                    ),
                    Row(
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: <Widget>[
                        RoundIconButton(
                          icon: FontAwesomeIcons.minus,
                          onPressed: () {
                            setState(
                              () {
                                age--;
                              },
                            );
                          },
                        ),
                        SizedBox(
                          width: 10.0,
                        ),
                        RoundIconButton(
                            icon: FontAwesomeIcons.plus,
                            onPressed: () {
                              setState(() {
                                age++;
                              });
                            })
                      ],
                    )
                  ],
                ),
              ),
            ),
          ],
        ),
      ),
      BottomButton(
        buttonTitle: 'CALCULATE',
        onTap: () {
          CalculatorBrain calc =
              CalculatorBrain(height: height, weight: weight);

          Navigator.push(
            context,
            MaterialPageRoute(
              builder: (context) => ResultsPage(
                    bmiResult: calc.calculateBMI(),
                    resultText: calc.getResult(),
                    interpretation: calc.getInterpretation(),
                  ),
            ),
          );
        },
      ),
    ],
  ),

这是文件： https://github.com/londonappbrewery/BMI-Calculator-Flutter-Completed/blob/master/lib/screens/input_page.dart

在模拟器上，它可以正常工作，但是在我的Galaxy S7上存在一些错误：

我尝试了不同的解决方案，例如将主列包装在SingleChildScrollView内，但是它不起作用。

是否可以使用滚动条或其他工具？

还是我必须改用ListView？在这种情况下，没有诸如mainAxisAlignment或crossAxisAlignment之类的属性。

我做错了什么？

Answer 1

您可以用容器和FittedBox包裹 ReusableCard ：

class ReusableCard extends StatelessWidget {
  ReusableCard({@required this.colour, this.cardChild, this.onPress});

  final Color colour;
  final Widget cardChild;
  final Function onPress;

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: onPress,
      child: Container(
        width: MediaQuery.of(context).size.width * 0.5,
        height: MediaQuery.of(context).size.height * 0.2,
        child: FittedBox(
          child: cardChild,
        ),
        margin: EdgeInsets.all(15.0),
        decoration: BoxDecoration(
          color: colour,
          borderRadius: BorderRadius.circular(10.0),
        ),
      ),
    );
  }
}

结果：

您可以根据需要根据当前设备的宽度或高度调整容器的大小。

颤动的底部被列的像素溢出

1 个答案: