Why isn't my nib interfacing with my code?

Can someone help me figure out this weird issue?

None of m开发者_如何学Cy button actions are getting called.

http://drop.io/cpyexk7

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Some common problems with these symptoms:

• You didn't set the class of your NIB properly. Make sure it's an instance of your view controller subclass, not UIViewController.
• You didn't create the appropriate IBAction outlets or connect them. Double-check that all the connections are made properly.

Without in-question code or pictures, I can't be more specific.