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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。