Adding markers to the map

A map without points of interest is less useful. In this recipe, you will learn how to generate markers, or annotations as they are called in iOS terminology.

How to do it…

Follow these steps:

1. Open the Chapter6-Recipe4-Begin folder and then the .xcworkspace file in Xcode. This project contains the project as it ended in the previous recipe.

2. The + button is already connected in the storyboard to our viewController.m file's following method:

   - (IBAction)addAnnotation:(id)sender

   We first need to initialize a new annotation. We will first create a new MGLPointAnnoation object. Within the – (IBAction)addAnnotation:(id)sender context, add the following line:

   MGLPointAnnotation *annotation = [[MGLPointAnnotation alloc] init];

3. The next step is to pass the coordinates; run the following command for this:

   [annotation setCoordinate:self.mapView.centerCoordinate];

   Here, self.mapView.centerCoordinate will create the annotation at the center of our map. It will always be at the center...