Creating UIfocus guide dynamically

I have a collection of images on a UICollectionView . For each image I get dynamic number of hotspots (x,y coordinates) from a server and I create and place dynamic UIButtons on those hotspots as subviews of the main UIImageView. I really need to know how to setup Focus guide for these dynamically created buttons on specific x,y coords on the UIImageView ?

Creating UIfocus guide dynamically
 
 
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