从AppDelegate访问ViewController

Question

我的问题如下,

在我的一个中ViewControllers,当用户点击一个按钮时,我使用此代码注册设备以进行通知.

[[UIApplication sharedApplication] registerForRemoteNotificationTypes:
(UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert)];

然后,在AppDelegte,有两种方法.一个接收令牌,另一个收到错误.

- (void)application:(UIApplication*)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData*)deviceToken
- (void)application:(UIApplication*)application didFailToRegisterForRemoteNotificationsWithError:(NSError*)error

现在出现了问题,didRegisterForRemoteNotificationsWithDeviceToken我需要将令牌发送到我的服务器,并带有一些用户输入的数据View,如用户名.

我怎样才能获得这些数据？

Answer 1

这NSNotificationCenter将很好地为你服务.在AppDelegate中didRegisterForRemoteNotificationsWithDeviceToken,执行以下操作:

[[NSNotificationCenter defaultCenter] postNotificationName:@"RegistrationReceived"
                                                    object:token];

并且,在你的控制器中viewDidLoad,

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(updateRegistrationInfo:)
                                             name:@"RegistrationReceived" 
                                           object:nil];

一定要实现-updateRegistrationInfo:(或任何你想要命名的)来接收NSNotification和作为参数传入的令牌.此外,当您不再需要时,请取消注册通知.

- (void)updateRegistrationInfo:(NSNotification *)notification
{
    NSString *myObject = [notification object];
    ...
}