检查应用程序是否首次在Flutter上运行 [英] Check if an application is on its first run with Flutter

问题描述

基本上，我想拥有一个屏幕/视图，该屏幕/视图将在用户首次打开应用程序时打开。这将是登录屏幕类型的事物。

Basically, I want to have a screen/view that will open when the user opens up the app for the first time. This will be a login screen type of thing.

推荐答案

使用共享的首选项包。您可以使用 FutureBuilder 进行阅读，并且可以检查是否存在名为 welcome 的布尔值。这是我代码中的实现：

Use Shared Preferences Package. You can read it with FutureBuilder, and you can check if there is a bool named welcome for example. This is the implementation I have in my code:

return new FutureBuilder<SharedPreferences>(
      future: SharedPreferences.getInstance(),
      builder:
          (BuildContext context, AsyncSnapshot<SharedPreferences> snapshot) {
        switch (snapshot.connectionState) {
          case ConnectionState.none:
          case ConnectionState.waiting:
            return new LoadingScreen();
          default:
            if (!snapshot.hasError) {
              @ToDo("Return a welcome screen")
              return snapshot.data.getBool("welcome") != null
                  ? new MainView()
                  : new LoadingScreen();
            } else {
              return new ErrorScreen(error: snapshot.error);
            }
        }
      },
    );

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