Check if mapView already contains an annotation?

Your for loop isn't checking if the annotation is on the screen, it is checking if the coordinates of the pin are currently within the visible area. Even if it was checking if the pin object was already in the mapView. Annotations it would never be true, because you've only just created pin a few lines earlier, it can't possibly be the same object as on in the mapView.

Annotations . It might though have the same coordinates and title, and that's what you need to check.

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