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• 备用仓库

• Lab: Write your first Flutter app

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• Cookbook: Useful Flutter samples

For help getting started with Flutter development, view the online documentation, which offers tutorials, samples, guidance on mobile development, and a full API reference.

column 报错解决 SingleChildScrollView 包裹column

flutter 弹窗 ScaffoldMessenger.of(context).showSnackBar( const SnackBar( content: Text("请保存后点击 "i" 预览 "), duration: Duration(seconds: 1), ), );

how use sp?
import 'package:shared_preferences/shared_preferences.dart';

void main() { //获取共享首选项实例。

final SharedPreferences prefs = await SharedPreferences.getInstance();

//存储用户名。

prefs.setString('name', 'John Doe');

//检索用户名。

final String name = prefs.getString('name');

//打印用户名。 print('The user's name is $name'); }

简单捕获异常demo setState(() { try { // 可能会引发异常的代码 durations = int.parse(_textEditingController.text); throw Exception(durations); } catch (e) { // 处理异常的代码 // durations= 10;
print('捕获到异常：$e'); } print('保存或更新值: $durations'); });

--带 _ 符号的 不可跨越文件夹使用

// Flutter 2.0 版本中已经将 RaisedButton 替换为 ElevatedButton。