NSNotificationCenter is one way you can communicate with other objects in your project. Alternatives include KVO and delegates. Rather than go in to all the details and comparisons of each and when you might opt for a delegate model vs NSNotificationCenter, what I will quickly say is that if you want to simply share a message that a job has completed and perhaps have several other classes listening out then NSNotificationCenter might be the best option for you.

In todays example we are going to create a simple app that lets you search for an address or point of interest on a map. When that search is complete, a pin or several pins will be dropped on the map with the appropriate details for a callout to pop up when a pin is tapped on. [Read more…]