Keyboard and cursor show, but I can't type inside UITextFields and UITextViews

Question

On an iPad with iOS 6 GM. I have 6 UITextFields, 3 UITextViews, and a UIButton that triggers a popover/actionsheet.

When I select one of the UITextFields or UITextVie

Answer 1

These solutions didn't work for me, but after I deleted the derived data folder at ~/Library/Developer/Xcode/DerivedData/AppName, it worked.