ios - associate existing classes with storyboard -


i'm new ios developing please forgive me if question naive. i'm writing app based on other's code, , author original code generated ui elements programmatically (no xib/nib files). want modify interface , go storyboard approach, have associate existing classes new view controllers have on storyboard. changed "custom class" existing class via interface builder. keep getting error:

2014-03-12 22:49:56.187 reader[9064:a0b] app delegate must implement window property if wants use main storyboard file.

any thoughts? hope don't have start on scratch.

it means says. go app delegate file, named xxappdelegate.h, declare property in app delegate class so:

@property (strong, nonatomic) uiwindow *window;

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