View doesn't respond to touches after shake

In my app I've implemented a shake event and it shows a UIImageView. When the UIImageView is shown, I hide the Nav Bar with:

[self.navi开发者_StackOverflow社区gationController setNavigationBarHidden:YES animated:NO];

And after that I want to bring it back when user touches the screen:

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    [[self navigationController] setNavigationBarHidden:NO animated:YES];

}

But it doesn't work! Like my view doesn't respond to touches.

Thanks in advance!

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You many need to enable user interaction on your view if it isn't already.