From the code and according to the MapKit guide, your code look correct. I am thinking that it could be this line annotationView.image = UIImage(named: "image.png")
Is there a chance that image.png could be the wrong image name or not added in to the project when compile? Also just fyi, if you are using .xcassets, you does not have to add a .png.
As annotationView.image is a optional, when the image UIImage(named: "image.png") is nil, it will not crash but just render the default pin image.
If this is not the issue, please provide more info on the debugging steps that you have taken so the rest of us can understand better and help you. Cheers =)
