Click the event to add a different position to call

From the Xib picture and label to the controller, and then in the viewdidload to give them a click gesture, very strange, not only no click gesture, and learn not the control, the name is from the Xib Riteau line to the control of the controller how there is no value, and not like directly write the property of a null pointer, Need to give it a real object.

First of all, what's this xib about?

Xib put a few picture controls and a few labels and a button, the picture and label added to the click event, and then this xib as a controller Footerview, the program is no value no click events, and finally found that the location of the Click event is not correct

Click the event to add a different position to call