前言
BaseFlutter開源專案基於Flutter2.0,語法上空安全,是Provider MVVM的最佳實踐,可以用於線上應用的優秀架構,該專案使用了很多實際專案開發中需要用到了技術和第三方框架,而且做了很多基礎封裝,可以直接拿到實際專案中使用,而且學習這個專案還可以幫助新手減降低學習難度,提供學習方向,實現flutter快速入門,github連結
程式碼結構
部分程式碼示例
abstract class BaseState<W extends StatefulWidget, VM extends BaseViewModel>
extends State<W>
with
BaseStateInterface,
NavigatorMixin,
ToastMixin,
EventBusMixin,
SharePreferenceMixin,
ScreenAdapterMixin{
late VM viewModel;//這裡需要改成late,不能用?,不然Provider會報錯
EventBus? eventBus;
LoadingDialog? loadingDialog;
late bool isBuildFinish;
@override
void initState() {
super.initState();
isBuildFinish = false;
WidgetsBinding widgetsBinding = WidgetsBinding.instance!;
widgetsBinding.addPostFrameCallback((callback) {
//說明build結束了
print("====>build結束了");
isBuildFinish = true;
onBuildFinish();
});
setContext(context);
setIsDispose(false);
viewModel = getIt.get<VM>();
viewModel.context = context;
viewModel.init();
viewModel.showLoadingFun = () {
showLoading();
};
viewModel.dismissLoadingFun = () {
loadingDialog?.dismissDialog();
};
initEventBus();
}
@override
void onBuildFinish() {}
@override
void initEventBus() {
if (eventBus == null) {
eventBus = EventBus.get();
}
}
void showLoading() async {
if (isBuildFinish) {
//必須等到父元件build結束後才能構建自己,https://blog.csdn.net/qq_39493848/article/details/108514136
showDialog(
context: context,
builder: (_) {
if (loadingDialog == null) {
loadingDialog = LoadingDialog();
}
return loadingDialog!;
});
} else {
await Future.delayed(Duration(milliseconds: 10));
showLoading();
}
}
@override
void dispose() {
super.dispose();
setIsDispose(true);
viewModel.showLoadingFun = null;
viewModel.dismissLoadingFun = null;
}
}
複製程式碼
abstract class BaseViewModel<M extends Object> extends ChangeNotifier
with
BaseViewModelInterface,
NavigatorMixin,
ToastMixin,
SharePreferenceMixin,
EventBusMixin,
DataBaseMixin {
int _loadNum = 0;
int _minLoadNum = 1;
late BuildContext context;
late M model;
bool _isDispose = false;
bool get isDispose => _isDispose;
int needLoadingRequestCount = 0;
bool isLoading = false;
Function()? showLoadingFun;
Function? dismissLoadingFun;
static bool isNeedCatchError = false;
set minLoadNum(int value) {
_minLoadNum = value;
}
set loadNum(int value) {
_loadNum = value;
}
int get loadNum {
return _loadNum;
}
void notifyPage() {
if (!_isDispose) {
loadNum++;
print("====>loadNum:$loadNum");
if (_loadNum >= _minLoadNum) {
print("====>notifyListeners");
notifyListeners();
}
}
}
@override
void init() {
model = getIt.get<M>();
setContext(context);
setIsDispose(false);
}
void showLoading(bool isNeedLoading) {
if (isNeedLoading) {
needLoadingRequestCount++;
if (!isLoading) {
isLoading = true;
if (showLoadingFun != null) {
showLoadingFun!.call();
}
showLoadingFun?.call();
}
}
}
void dismissLoading(bool isNeedLoading) {
if (isNeedLoading) {
needLoadingRequestCount--;
if (needLoadingRequestCount == 0) {
isLoading = false;
if (dismissLoadingFun != null) {
dismissLoadingFun!.call();
}
dismissLoadingFun?.call();
}
}
}
/// 發起網路請求,同時處理異常,loading
void sendRequest<T>(Future<T> future, FutureOr<dynamic> onValue(T value),
{Function(Exception e)? error, bool isNeedLoading = false}) {
showLoading(isNeedLoading);
future.then((t) {
dismissLoading(isNeedLoading);
onValue(t);
});
if (isNeedCatchError) {
future.catchError((e) {
dismissLoading(isNeedLoading);
print("====>error:$e");
if (error != null) {
error(e);
}
});
}
}
@override
void dispose() {
super.dispose();
_isDispose = true;
setIsDispose(_isDispose);
}
}
複製程式碼
@injectable
class LoginViewModel extends BaseViewModel<LoginModel> {
@factoryMethod
LoginViewModel();
String loginName = "";
String psw = "";
///登入
void login() {
if (loginName.isEmpty) {
showToast("登入賬號不可為空");
} else if (psw.isEmpty) {
showToast("登入密碼不可為空");
} else {
sendRequest<LoginResult>(model.login(loginName, psw), (value) {
if (value.errorCode == 0) {
UserInfoSp.getInstance().uid = value.data!.id!;
UserInfoSp.getInstance().token = value.data!.token!;
UserInfoSp.getInstance().userName = value.data!.username!;
pop();
push(MainPage());
} else {
showToast(value.errorMsg!);
}
}, isNeedLoading: true);
}
}
}
複製程式碼
使用的第三方框架
- 1. injectable
配合get_it框架,在編譯時生成程式碼,實現依賴注入 - 2.dio
實現網路請求 - 3.get_it
實現依賴注入 - 4.retrofit
結合dio實現網路請求,編譯時生成網路請求的程式碼 - 5.logger
日誌列印 - 6.toast
吐司 - 7.event_bus
實現不同頁面和元件的通訊 - 8.json_serializable
結合json_annotation實現json資料序列化 - 9.extended_image
實現網路圖片的載入,強大的官方 Image 擴充套件元件, 支援載入以及失敗顯示,快取網路圖片,縮放拖拽圖片,繪製自定義效果等功能 - 10.webview_flutter
實現網頁的載入 - 11.shared_preferences
簡單的資料持久儲存 - 12.pull_to_refresh
實現下拉重新整理和分頁載入 - 13.floor
資料庫,使用類似於retrofit - 14.flutter_swiper
圖片輪播
使用的架構和基礎封裝
- 基於Flutter2.0,語法空安全
- 結合Provider實現MVVM架構,封裝了BaseState,BaseStatefulWidget,BaseViewModel
- 結合模板方法模式,泛型,Mixin,依賴注入等方式,封裝了大量重複的邏輯,簡化了開發難度
- Mixin類的封裝:目前包含NavigatorMixin,ToastMixin,SharePreferenceMixin,EventBusMixin,DataBaseMixin
- 基礎Widget的封裝:例如BottomDialog,CenterDialog,EnsureAndCancelDialog,LoadingDialog,PopupWindow,CommonWrap,LazyIndexedStack等等
- BaseViewModel統一網路請求,統一發起網路請求,同時處理異常,loading
- 使用擴充套件函式:擴充套件自Object,List,int,Widget,讓程式碼更加簡潔優雅
後期規劃
1.路由,實現各模組,各業務的解耦
2.元件化
3.記憶體洩漏檢測
4.埋點框架
5.各種炫酷動畫
6.效能優化
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