CupertinoActivityIndicator 加载指示器组件

main.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'CupertinoActivityIndicator 示例',
      home: Scaffold(
        appBar: AppBar(
          title: Text("CupertinoActivityIndicator 示例"),
        ),
        body: Center(
          child: CupertinoActivityIndicator(
//            加载图形的半径
            radius: 20.0,
//            是否播放加载动画
            animating: true,
          ),
        ),
      ),
    );
  }
}