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通过 async 功能 onPressed 帐户图标。你的 异步的 函数应该是这样的。

例子:

//On Home Page, for account icon pressed
Future<void> checkCredsAndNavigate(){
  bool loggedIn = _checkIfLoggedIn(); // this might be a function that gets status of user login, you can fetch from prefs, state, etc.
  if(!loggedIn){
    var data = await Navigator.of(context).pushNamed('YOUR_LOGIN_ROUTE_NAME');
    if(data == null){ // Check for data, will be null when user cancels login
      return;
    }
  }
  Navigator.of(context).pushNamed('YOUR_ACCOUNT_ROUTE_NAME');
}


//On Login page,
// On successful login call
Navigator.of(context).pop(data); // this data can be anything like user id, or just a boolean indicating successful login,etc.

//To cancel login, call
Navigator.of(context).pop();

希望这有帮助!