'How to make object that is being dragged the foreground object

I am working on an app that has users drag objects to target locations. Everything thus far is programmatically created, aka no storyboard. My issue is that for the draggable objects, the colored circles on the right, when dragged over the target area, they are behind the target area. Is there a way for it to be the foreground object?

Here is a picture: currentAppSetup



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