It appears this is true of presenting anything over a popover. The reason all of the previous responses work is likely because whatever action is being taken happens before the popover (or activity sheet, or similar) is dismissed.
If you can, try dismissing the popover first, then presenting your modal.
It appears this is true of presenting anything over a pop...
错误信息 Warning: Attempt to present on which is already ...
报错：Warning: Attempt to present < UINavigationController: ...
Attempt to present <***ViewController: 0x****> on
Warning: Attempt to present on
1.Warning: Attempt to present on whose view is not in t...
Warning: Attempt to present
警告：Warning: Attempt to present
报错 Warning: Attempt to present
1、错误：Warning: Attempt to present
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