title: Use of undeclared identifier 'UILocalNotification'
body: <p>Recently I have learned how to program a iOS project. I coded by followed a tutorial.But the same code the different result. Maybe there is something wrong with header file? I imported a header file in the same project.Although it made Xcode no warn about "use of undeclared identifier 'UILocalNotification' ", it did't make the effect that I want.And I want to say ,in the tutorial the teacher did't have imported this header file .So mistake must not be here.</p>