Set App delegate as first responder

Question

I'm trying to implement a shake recognition that works throughout my application. To do this I'm adding the following code to my xxxAppDelegate.m:

-(BOOL)canBecomeFirstResponder {
    return YES;
}

- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event {
    if (event.type == UIEventSubtypeMotionShake) {
        NSLog(@"Shaken, not stirred.");
    }
}

But because in the .h file the delegate is defined as a

@interface xxxAppDelegate : NSObject <UIApplicationDelegate, UITabBarControllerDelegate>

I cannot use the

[self becomeFirstResponder];

in the .m to make the app delegate the first responder. Therefore of course it doesn't work. What would be the best way to get it working?

Answer 1

What happens if you change the app delegate to a subclass of UIResponder?

Edit

You can read about the responder chain here in the documentation.