设置菜单和工具条

-(void) setBar
{
    UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:nil];
    
    UIBarButtonItem *searchButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemSearch target:self action:nil];
    
    self.navigationItem.leftBarButtonItems = @[addButton, searchButton];
    
    UIBarButtonItem *organizeButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemOrganize target:self action:nil];
    
    [self setToolbarItems:@[organizeButton]];
}

-(void) showBar
{
    // 无论哪套设置方法都可以这么判断是否隐藏
    if (self.navigationController.navigationBar.hidden)
    {
        NSLog(@"show it");
        
        // 两套隐藏方法，这套无动画，不可混用
        //self.navigationController.navigationBar.hidden = NO;
        //self.navigationController.toolbar.hidden = NO;
        
        // 有动画
        [self.navigationController setNavigationBarHidden:NO animated:YES];
        [self.navigationController setToolbarHidden:NO animated:YES];
        
    }
    else
    {
        NSLog(@"hide it");
        [self.navigationController setNavigationBarHidden:YES animated:YES];
        [self.navigationController setToolbarHidden:YES animated:YES];
    }
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    [self setBar];
    
}

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    [self showBar];
}