change custom annotation text without removing them iPhone

I have a query which is almost similar to my previous question but Since I didnt got the answer there Here's the another scen开发者_如何学Goario

I have 2 annotation on the map with label 1 and 2 now I want to replace their values.

Is it possible without removing both the annotation and inserting them again?

Pls go through the project from this link Moving annotations. It changes the coordinates without removing them. I think you can try something similar to that.

But i think its also possible if you have reference to that annotation.