void hidePanel if self transform tx self hidePanelButton transform CGA

- (void)hidePanel {
    
    if (self.transform.tx != 0.f) {
        self.hidePanelButton.transform = CGAffineTransformMakeTranslation(NAVIGATION_MENU_WIDTH, 0.f);
        [self addSubview:self.hidePanelButton];
    }
    
    [UIView animateWithDuration:ANIMATION_DURATION animations:^{
        
        if (self.transform.tx == 0.f) {
            self.transform = CGAffineTransformMakeTranslation(-NAVIGATION_MENU_WIDTH, 0.f);
            self.hidePanelButton.transform = CGAffineTransformMakeTranslation(NAVIGATION_MENU_WIDTH, 0.f);
            [self.hidePanelButton setImage:[UIImage imageNamed:@"hidePanelHighlightedIcon.png"] forState:UIControlStateNormal];
        } else {
            self.transform = CGAffineTransformIdentity;
            self.hidePanelButton.transform = CGAffineTransformIdentity;
        }
    } completion:^(BOOL finished) {
        
        if (self.transform.tx == 0.f) {
            [self.hidePanelButton setImage:[UIImage imageNamed:@"hidePanelIcon.png"] forState:UIControlStateNormal];
        } else {
            self.hidePanelButton.transform = CGAffineTransformIdentity;
            [self.delegate.view addSubview:self.hidePanelButton];
        }
    }];
}