angularjs - angularfire $waitForSignIn() 用法？

Question

我想弄清楚 $waitForSignIn()

的用法是什么

文档说:

$waitForSignIn() which returns a promise fulfilled with the current authentication state. This is useful when you want to grab the authentication state before the route is rendered

但这将如何运作？

他们说你应该实现如下(来自:link):

app.config(["$stateProvider", function ($stateProvider) {
  $stateProvider
    .state("home", {
      // the rest is the same for ui-router and ngRoute...
      controller: "HomeCtrl",
      templateUrl: "views/home.html",
      resolve: {
        // controller will not be loaded until $waitForSignIn resolves
        // Auth refers to our $firebaseAuth wrapper in the example above
        "currentAuth": ["Auth", function(Auth) {
          // $waitForSignIn returns a promise so the resolve waits for it to complete
          return Auth.$waitForSignIn();
        }]
      }
    })
    .state("account", {
      // the rest is the same for ui-router and ngRoute...
      controller: "AccountCtrl",
      templateUrl: "views/account.html",
      resolve: {
        // controller will not be loaded until $requireSignIn resolves
        // Auth refers to our $firebaseAuth wrapper in the example above
        "currentAuth": ["Auth", function(Auth) {
          // $requireSignIn returns a promise so the resolve waits for it to complete
          // If the promise is rejected, it will throw a $stateChangeError (see above)
          return Auth.$requireSignIn();
        }]
      }
    });
}]);

所以您希望在用户登录时加载 HomeCtrl 吗？但是当没有用户登录时，它会在 null 上加载 currentAuth，

然后我尝试在 currentAuth 上放置一个观察者，当用户登录时没有变化。但是没有触发登录或退出的事件

接下来我想它只会在您尝试登录时等待(例如通过弹出窗口)。所以我启动了弹出窗口，然后直接切换到主页，但随后我从 currentAuth 得到了一个 null，如果我刷新，我得到了我的用户数据。

那有什么意义呢？只是为了在用户可用时解决用户问题？

Answer 1

您应该期望您的 HomeCtrl 知道用户是否已登录，如果用户未登录，您的帐户路由将限制访问。