Thank you for the update.
We have analyzed the reported issue “Set frame for calendar doesn’t apply properly in iOS” and it works fine from our end. Based on the code snippet you have shared we found that you have set the frame Y position from 0, and mentioned that you have added the view as last in the stack, which means there is views in top of calendar. Hence you need to set the frame by considering the view and arrange the views on the stack based on the previous view height.
We have prepared a sample for the same.
We hope that this helps. If the sample doesn’t meet your requirement kindly revert us by modifying the sample based on your scenario and share the replication procedure which help us to analyze and resolve the reported issue.
Subburaj Pandian V