可以使用故事板登录屏幕吗？ [英] Login Screen with Storyboarding possible?

问题描述

我正在使用新的iOS 5功能并尝试使用新的故事板功能将我的应用程序重写为纯iOS 5应用程序。

I am playing around with the new iOS 5 features and trying to rewriting one of my apps as pure iOS 5 app using the new storyboarding feature.

要剪切一个长话短说，我有一个开始屏幕，如果用户保存了一些登录数据，应用程序尝试连接到服务器，如果没有，它应该要求它们。

To cut a long story short, I have a start screen where the app tries to connect to a server if the user saved some login data, if not, it should ask for them.

我就是这样做的。我创建了一个Viewcontroller，它在viewDidLoad方法中执行连接。如果没有登录数据或登录不成功，我需要在登录屏幕上进行手动操作。

Here is how I would do it. I create a Viewcontroller which is doing the connection thing in the viewDidLoad method. If there is no login data or the login is not successful, I need a to do a manual segue to the login screen.

现在这是可能的，或者我是需要2个故事板吗？

Now is this even possible, or do I need 2 story boards for that ?

推荐答案

我已经通过放置一个没有任何segues的登录视图（来自或来自它）解决了它如下面的屏幕截图所示：

I have solved it by putting a login view without any segues (to or from it) like in the screenshot below:

然后，我在标签栏控制器中使用了一个自定义类，以便在需要时显示它。

Then, I used a custom class in the tab bar controller to show it whenever I need it.

在标签栏控制器类中，我使用'viewDidLoad'来启动登录视图。为了显示模态视图，我确实有一个单独的东西存储一些状态，比如BOOL isAuthenticated，我做魔术：

In the tab bar controller class, I use 'viewDidLoad' to fire up the login view. To show the modal view, I do have a singleton thingy that stores some state, say BOOL isAuthenticated, where I do the magic:

- (void) performLoginIfRequired: (UIViewController *) source {

   if (!self.isAuthenticated) {

       NSLog(@"Is not authed");

       UIStoryboard *storyboard = [UIApplication sharedApplication].delegate.window.rootViewController.storyboard;

       UIViewController *loginController = [storyboard instantiateViewControllerWithIdentifier:@"loginScreen"];

       [source presentModalViewController:loginController animated:YES];

   } else {
       NSLog(@"Is authe");

   }
}

而且，就我而言，我希望它在应用程序首次启动时显示，但也在它再次进入前景时显示。所以，我在通知中心注册了我的标签栏控制器，因此我会在应用程序回来时收到通知：

And, in my case, I wanted it to be shown when the app first starts, but also when it enters foreground again. So, I registered my tab bar controller with the notification center, so I get notified if the app is coming back:

-(void)viewDidLoad {
    [[NSNotificationCenter defaultCenter] addObserver:self  selector:@selector(willEnterForeground:) name:UIApplicationWillEnterForegroundNotification object:nil];
}

在willEnterForeground方法中，我这样做：

In the willEnterForeground method, I do:

-(void) willEnterForeground: (NSNotification *)notification {
    [[myStateThingy defaultState] performLoginIfRequired:self]; 
}

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