ios - 在 Appdelegate.m 的后台线程上发送 NSNotification

Question

我正在接收远程通知。我想发布一个 nsnotification。我可以发布通知，但我无法在我当前的 View Controller 中接收它。

这是我的代码。

我知道这被称为:

AppDelegate.m

 - (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
 {

 [[NSNotificationCenter defaultCenter] postNotificationName:CHAT_MESSAGE_RECEIVED object:nil userInfo:messageIdDict];

 }

这会在上面的代码被调用之前被调用

MyViewController.m

 -(void)viewWillAppear:(BOOL)animated
 {

 [[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(messageReceived:)
                                             name:CHAT_MESSAGE_RECEIVED
                                           object:self];

 }

 -(void)messageReceived:(NSDictionary *)userInfo
 {
      NSLog(@"Logged");
 }

Answer 1

下面是我的做法:

在 AppDelegate 中:

- (void)application:(UIApplication *)application 
didReceiveRemoteNotification:(NSDictionary *)userInfo
 {

 [[NSNotificationCenter defaultCenter] postNotificationName:CHAT_MESSAGE_RECEIVED              
                                                     object:messageIdDict 
                                                   userInfo:nil];

 }

在 MyViewController 中:

-(void)viewWillAppear:(BOOL)animated
 {

 [[NSNotificationCenter defaultCenter] addObserver:self
                                          selector:@selector(messageReceived:)
                                              name:CHAT_MESSAGE_RECEIVED
                                            object:nil];

 }

 -(void)messageReceived:(NSNotification *)notification
 {
      NSDictionary *userInfo = NSDictionary dictionaryWithDictionary:[notification object]];
      NSLog(@"Logged");
 }

希望对你有帮助