ios - Check if a subview is in a view using Swift -


how test if subview has been added parent view? if hasn't been added, want add it. otherwise, want remove it.

you can use uiview method isdescendantofview:

if mysubview.isdescendantofview(someparentview) {     someparentview.mysubview.removefromsuperview() } else {     someparentview.addsubview(mysubview) }

you may need surround if mysubview != nil depending on implementation.


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