Assertion on Navigator.push() caused by OverlayEntry in Flutter
来源： https://stackoverflow.com/questions/53817422/assertion-on-navigator-push-caused-by-overlayentry-in-flutter
dart
Assertion on Navigator.push() caused by OverlayEntry in Flutter
来源： https://stackoverflow.com/questions/53817422/assertion-on-navigator-push-caused-by-overlayentry-in-flutter
constraints.hasBoundedHeight': is not true flutter
来源： https://stackoverflow.com/questions/54774024/constraints-hasboundedheight-is-not-true-flutter
constraints.hasBoundedHeight': is not true flutter
来源： https://stackoverflow.com/questions/54774024/constraints-hasboundedheight-is-not-true-flutter
variable not being changed out of then scope in flutter
来源： https://stackoverflow.com/questions/63297466/variable-not-being-changed-out-of-then-scope-in-flutter
variable not being changed out of then scope in flutter
来源： https://stackoverflow.com/questions/63297466/variable-not-being-changed-out-of-then-scope-in-flutter
variable not being changed out of then scope in flutter
来源： https://stackoverflow.com/questions/63297466/variable-not-being-changed-out-of-then-scope-in-flutter
variable not being changed out of then scope in flutter
来源： https://stackoverflow.com/questions/63297466/variable-not-being-changed-out-of-then-scope-in-flutter
variable not being changed out of then scope in flutter
来源： https://stackoverflow.com/questions/63297466/variable-not-being-changed-out-of-then-scope-in-flutter
FlutterDojo设计之道—状态管理之路（三）
Dart作为一个现代化的编程语言，吸收了很多语言的特点，特别是响应式编程的风格。 通过Dart提供的Stream机制，Flutter可以很轻松的构建响应式的编程方式，同时也让跨页面、跨Widget的数据管理问题迎刃而解。 Flutter的响应式编程，具有下面几个特点。 数据的管理，围绕Stream进行，通过Stream的sink和listen，来进行数据的管理 Widget发出Stream后，无需感知外界的影响，同样的，Widget在listen Stream时，只需要根据数据的改变来构建UI Widget之间不再耦合，通过Stream管道获取数据，互相无依赖 借助Flutter的这个特性，Google在数据管理之路上提出了BLoC模式。 BLoC模式由Paolo Soares和Cong Hui设计，并谷歌在2018的DartConf首次提出，全称Business Logic Component。 在BLoC模式下，Widget与Data彻底解耦： App的业务逻辑处理都在BLoC中 Widget通过Sink向BLoC发送数据 BLoC通过Stream通知Widget重建UI 这其实有点类似MVP、MVC模式，BLoC模式将整个App分为三层，Data Layer、BLoC Layer、UI Layer，Data