两个控制器之间的通信

//A控制器中

- (void)toDo{

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(nearbyToRootVcCommunication) name:@"nearbyToRootVcCommunication" object:nil];
}
//当B控制器中的viewDidLoad方法调用时，此方法也会被触发

-(void)nearbyToRootVcCommunication{

     NSLog(@"已回调");

}
//=====================
//B控制器中
- (void)viewDidLoad{

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

}

两个控制器之间的通信