Instead of overriding the action method of default back button create a custom button. this is one of the way Try this
{
UIButton *urButton = [UIButton buttonWithType:UIButtonTypeCustom];
urButton.frame = urRequiredFrame;
[urButton setImage:urImage forState:UIControlStateNormal];
[urButton addTarget:self action:@selector(performBackNav:)
forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *doneButton =[[UIBarButtonItem alloc] initWithCustomView:urButton];
self.navigationItem.leftBarButtonItem=doneButton;
}
-(void)performBackNav:(id)sender {
//Actions
[self.navigationController popViewControllerAnimated:NO];
}