All mkannotation(s) showing + a new one when tapped

I have a question about MKAnnotation. I currently have a map with 4 pins each with an annotation badge thing that shows up when the pin is tapped. Only the last pin loaded has the annotation showing.

I was wondering if it is possible first to have all annotations show together. Second if it is possible to have a second annotation when the pin is tapped, basically replacing the old on开发者_开发问答e.

--> I actually want to have a little icon show up above each (all) pin(s) and when tapped another annotation shows up with some details...

Thanks for your help