unwind segue not work

Question

I add a an action method to view controller and Ctrl-Drag the button to Exit icon in storyboard,and the unwind segue is created successfully.But when I touch the button, the unwind segue doesn't work(the current scene doesn't navigate to original scene) and the action method isn't triggered.I don't know why.

here is the action method

@interface HMCViewController2 : UIViewController
-(IBAction)return:(UIStoryboardSegue *)segue;
@end

@implementation HMCViewController2
...
-(IBAction)return:(UIStoryboardSegue *)segue{

}

@end

I upload the project to google drive.

Answer 1

You have put your unwind segue code in the wrong viewController. It should be located in the controller you wish to unwind TO, not the controller you are returning FROM.