...声明一个枚举类型需要使用关键字 enum : enum LGColor { red, green, blue } 在枚举中每个值都有一个 index getter 方法,它返回一个在枚举声明中从.../ 在枚举中每个值都有一个 index getter 方法,它返回一个在枚举声明中从 0 开始的位置。...你不能在子类中混合或实现一个枚举。
import'package:flutter/services.dart';///吐司类型 [LENGTH_SHORT]短时间,[LENGTH_LONG]长时间enumToast{LENGTH_SHORT,LENGTH_LONG}///吐司类classIaToast{staticconstMethodChannel _channel=//方法渠道名constMethodChannel('www.toly1994.com.flutter_journey.toast');staticshow(//静态方法显示吐司{String msg,Toa...
color=EnumTypeToValueList.fromString<Color>("red");print(color);// 输出: Color.red 5. 完整示例 import'package:flutter/material.dart';import'package:enum_type_to_value_list/enum_type_to_value_list.dart';enumColor{red,green,blue,}voidmain(){runApp(MyApp());}classMyAppextendsStatelessWidget...
voidmain() {//使用print(Season.SPRING.seasonName);//output: 春天}//枚举类enumSeason{ SPRING,//春天SUMMER,//夏天AUTUWN,//秋天WINTER//冬天}//对枚举类的拓展extensionPrintSeasononSeason{//枚举变量的实现方法StringgetseasonName{switch(this){caseSeason.SPRING:return'春天';caseSeason.SUMMER:return'夏...
Map<String, dynamic> toJson() { return {'name': name, 'weight': weight}; } 完整代码enum Animal { dog(name: 'dog', weight: 20), cat(name: 'cat', weight: 6); const Animal({required this.name, required this.weight}); factory Animal.fromName(String name) { return Animal.values....
enum Actions { Increment } // The reducer, which takes the previous count and increments it in response // to an Increment action. int counterReducer(int state, dynamic action) { return action == Actions.Increment ? state + 1 : state; ...
enum HttpMethod { GET, POST, DELETE } /// 针对于使用层面 abstract class BaseRequest { //统一的域名 String authority() { return "api.bilibili.com"; } //参数 var pathParams; //http://baidu.com/x/aa Map<String, String> params = Map(); //params //请求头 Map<String, dynamic> head...
import 'package:flutter/material.dart'; import 'package:flutter_redux/flutter_redux.dart'; import 'package:redux/redux.dart'; // One simple action: Increment enum Actions { Increment } // The reducer, which takes the previous count and increments it in response // to an Increment action. ...
import'package:flutter/material.dart';import'package:flutter_redux/flutter_redux.dart';import'package:redux/redux.dart';// One simple action: IncrementenumActions { Increment }// The reducer, which takes the previous count and increments it in response// to an Increment action.intcounterReducer(...
String jsonString = jsonEncode(response.data); print(jsonString); // 解析JSON字符串 Map<String, dynamic> json = jsonDecode(jsonString); // 获取特定字段值 imgPath.value = json['imgurl']; } @override Widget build(BuildContext context) { ...