iOS - Basic MKAnnotation Doesn't Show When Added Dynamically - ios

Question

I am making a simple map app - I am sending and receiving locations and text on a pubnub channel. When a chat message comes in, I want to use a simple MKAnnotation to draw the chat (I'm aware this is a horrifying act of UX and I don't care).
When my app delegate receives a message on the pubnub channel, it calls a method in the main view controller to draw the text message on the map. The method should use the latest user location for the pin's coordinates.
I'm not sure why, but I can't get the annotation to show from within my method. I have tried building the annotation from within the method and showing it. I've also tried making a custom annotation class and calling it from within my method. When I use the very same annotation code but hardcode it in my viewDidLoad then it shows up just fine. Any insight would be most appreciated.
My App Delegate:
#import "MyLocationAppDelegate.h"
#import "MyLocationViewController.h"
#implementation MyLocationAppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Override point for customization after application launch.
[PubNub setDelegate: self];
return YES;
}
- (void)pubnubClient:(PubNub *)client didReceiveMessage:(PNMessage *)message
{
NSString* text = message.message;
//Call drawChat method of MyLocationViewController
MyLocationViewController *MyLocViewController = [[MyLocationViewController alloc] init];
[MyLocViewController drawChat:text];
}
My View Controller:
#import "MyLocationViewController.h"
#import "MyLocationAppDelegate.h"
#import "MyLocationAnnotation.h"
CLLocation *userLocation;
#implementation MyLocationViewController {
CLLocationManager *locationManager;
}
- (void)viewDidLoad
{
[super viewDidLoad];
//Delegate map view
self.mapView.delegate = self;
[self SetUpChat];
[self configurePubNub];
//Instantiate location manager
if (nil == locationManager) {
locationManager = [[CLLocationManager alloc] init];
}
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];
NSLog(#"Application: viewDidLoad");
}
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
userLocation = [locations lastObject];
}
- (void)drawChat:(NSString *)message
{
//Create new annotation object
CLLocationCoordinate2D location;
location.latitude = userLocation.coordinate.latitude;
location.longitude = userLocation.coordinate.longitude;
MyLocationAnnotation *chat = [[MyLocationAnnotation alloc] initWithLocation:location andTitle:message];
[self.mapView addAnnotation:chat];
}
And MyLocationAnnotation.m
#import "MyLocationAnnotation.h"
#implementation MyLocationAnnotation
- (id)initWithLocation:(CLLocationCoordinate2D)coord andTitle:(NSString *)ttl {
self = [super init];
if (self) {
_coordinate = coord;
_title = ttl;
}
return self;
}
#end

Answer 1

Thanks to Anna's pointing out what I was doing wrong I was able to fix this:
Instead of redclaring my main view controller in the app delegate I did this instead:
MyLocationViewController *mainController = (MyLocationViewController *) self.window.rootViewController;
[mainController drawChat:text];
I was then able to call the method just fine with the data from app delegate.