如何在颤动中显示进度条以进行交付更新

Question

我想在我的应用程序中添加一个进度条，但我不知道该怎么做。我只是一个初学者，想学习如何添加进度条 in 交付应用程序

Answer 1

六个月后。我将把它留在这里以供将来参考。不要使用步进器小部件来实现这一点。它相当僵硬。请改用时间线小部件。时间线图块对我来说效果很好。 https://pub.dev/packages/timeline_tile

Answer 2

添加步骤

// Step Counter
int current_step = 0;

 List<Step> steps = [
    Step(
      title: Text('Step 1'),
      content: Text('Hello!'),
      isActive: true,
    ),
    Step(
      title: Text('Step 2'),
      content: Text('World!'),
      isActive: true,
    ),
    Step(
      title: Text('Step 3'),
      content: Text('Hello World!'),
      state: StepState.complete,
      isActive: true,
    ),
  ];

添加步进器

@override
  Widget build(BuildContext context) {
    return Scaffold(
      // Appbar
      appBar: AppBar(
        // Title
        title: Text("Simple Stepper Demo"),
      ),
      // Body
      body: Container(
        child: Stepper(
          currentStep: this.current_step,
          steps: steps,
          type: StepperType.vertical,
          onStepTapped: (step) {
            setState(() {
              current_step = step;
            });
          },
          onStepContinue: () {
            setState(() {
              if (current_step < steps.length - 1) {
                current_step = current_step + 1;
              } else {
                current_step = 0;
              }
            });
          },
          onStepCancel: () {
            setState(() {
              if (current_step > 0) {
                current_step = current_step - 1;
              } else {
                current_step = 0;
              }
            });
          },
        ),
      ),
    );
  }

onStepTapped 将设置当前步进计数。 onStepContinue 将递增步进计数器，并在我们的变量上调用 setState，将其设置为下一个计数器。 onStepCancel 将递减步进计数器并返回上一步。

完整代码

import 'package:flutter/material.dart';

class StepperDemo extends StatefulWidget {
  StepperDemo() : super();

  final String title = "Stepper Demo";

  @override
  StepperDemoState createState() => StepperDemoState();
}

class StepperDemoState extends State<StepperDemo> {
  //
  int current_step = 0;
  List<Step> steps = [
    Step(
      title: Text('Step 1'),
      content: Text('Hello!'),
      isActive: true,
    ),
    Step(
      title: Text('Step 2'),
      content: Text('World!'),
      isActive: true,
    ),
    Step(
      title: Text('Step 3'),
      content: Text('Hello World!'),
      state: StepState.complete,
      isActive: true,
    ),
  ];
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      // Appbar
      appBar: AppBar(
        // Title
        title: Text("Simple Stepper Demo"),
      ),
      // Body
      body: Container(
        child: Stepper(
          currentStep: this.current_step,
          steps: steps,
          type: StepperType.vertical,
          onStepTapped: (step) {
            setState(() {
              current_step = step;
            });
          },
          onStepContinue: () {
            setState(() {
              if (current_step < steps.length - 1) {
                current_step = current_step + 1;
              } else {
                current_step = 0;
              }
            });
          },
          onStepCancel: () {
            setState(() {
              if (current_step > 0) {
                current_step = current_step - 1;
              } else {
                current_step = 0;
              }
            });
          },
        ),
      ),
    );
  }
}