Focusing on Moving UIButtons

I have many (up to 15) UIButtons bouncing around the screen. They are focusable, however if the focused button is far away from the other buttons, it won't switch focus. How can I enable this?

Also, once a button is clicked, how can I stop it from being focusable? I tried disabling it, however that didn't work. I'd like it to automatically focus on a different button once clicked.


Thanks!

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