What does this warning mean: “setting the first responder view of the collection view but we don't know its type (cell/header/footer)”

问题

I have a UICollectionView with a UITextView in each cell. When I tap on one of the text views and the keyboard comes up, I get this warning in the output panel:

setting the first responder view of the collection view but we don't know its type (cell/header/footer)

Text input works fine, though. However, I'd really like to know what this warning means before I use this code in production.

回答1:

According to Apple, "you can safely ignore that".

https://devforums.apple.com/message/717898#717898

来源：https://stackoverflow.com/questions/12821670/what-does-this-warning-mean-setting-the-first-responder-view-of-the-collection