点击页面，UINavigationController导航栏的隐藏和显示

#pragma mark – 
#pragma mark onClick 
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
      isflage=!isflage; 
    [super.navigationController setNavigationBarHidden:isflage animated:TRUE];
    [super.navigationController setToolbarHidden:isflage animated:TRUE]; 
}