[英]Access ViewController from AppDelegate
My problem is the following, 我的问题如下,
In one of my ViewControllers
, when the user taps a button , I register the device for notifications with this code. 在我的一个ViewControllers
,当用户点击一个按钮时,我使用此代码注册设备以获取通知。
[[UIApplication sharedApplication] registerForRemoteNotificationTypes:
(UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert)];
Then, in the AppDelegte
, there are two methods. 然后,在AppDelegte
,有两种方法。 One that receives the token and one that gets the error. 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
And now comes the problem, in didRegisterForRemoteNotificationsWithDeviceToken
I need to send the token to my server, and with it some data that the user has entered in the View
, like its username. 现在出现了问题,在didRegisterForRemoteNotificationsWithDeviceToken
我需要将令牌发送到我的服务器,并使用它输入用户在View
输入的一些数据,如用户名。
How can I get this data? 我怎样才能获得这些数据?
The NSNotificationCenter
will serve you well here. NSNotificationCenter
将在这里为您提供良好的服务。 In your AppDelegate's didRegisterForRemoteNotificationsWithDeviceToken
, do this: 在AppDelegate的didRegisterForRemoteNotificationsWithDeviceToken
,执行以下操作:
[[NSNotificationCenter defaultCenter] postNotificationName:@"RegistrationReceived"
object:token];
And, in your controller's viewDidLoad
, 并且,在你的控制器的viewDidLoad
,
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(updateRegistrationInfo:)
name:@"RegistrationReceived"
object:nil];
Be sure to implement -updateRegistrationInfo:
(or whatever you want to name it) to receive the NSNotification
and the token, which is passed in as the argument. 确保实现-updateRegistrationInfo:
或任何你想要命名的东西)来接收NSNotification
和令牌,它作为参数传入。 Also, unregister for the notification when you no longer need it. 此外,当您不再需要时,请取消注册通知。
- (void)updateRegistrationInfo:(NSNotification *)notification
{
NSString *myObject = [notification object];
...
}
You can can add your ViewController
as an instance variable to your AppDelegate
class: 您可以将ViewController
作为实例变量添加到AppDelegate
类中:
@interface AppDelegate : NSObject <UIApplicationDelegate>
{
@private // Instance variables
UIWindow *mainWindow; // Main App Window
UINavigationController *navigationController;
UIViewController *someViewController;
}
And then add some methods to someViewController
that returns your requested data. 然后向someViewController
添加一些返回所请求数据的方法。
You can assign someViewController in - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
of the AppDelegate
class in this way: 您可以指定在someViewController - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
中的AppDelegate
这样的类:
someViewController = [[UIViewController alloc] initWithNibName:nil bundle:nil];
navigationController = [[UINavigationController alloc] initWithRootViewController:someViewController];
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