ios - Assigning to 'id<UITextFieldDelegate> _Nullable' from incompatible type 'HomeDataForm *const __strong' -

i above warning message listed following code:

self.classnumbertf.delegate = self; 

classnumbertf textfield , subview of uiview of self. self of type nsobject (homedataform). use line of code when user taps "done" on keyboard, keyboard dismissed. intend, not sure why getting warning. don't recall receiving warning until after installing xcode 7. thank you.

edit: added declaration homedataform.m per rmaddy.

original: resolved answer piyush patel: added declaration homedataform.h