模态

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}
//将要出现
-(void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
}
//已经消失的方法
-(void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    NSLog(@"%@",self.navigationController.viewControllers);
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    self.view.backgroundColor = [UIColor redColor];
    
//自定义naviagtionBar
    [self customNavigationBar];
    //布局button
    //[self layoutButton];
}
//布局button
-(void)layoutButton
{
    UIButton *bt = [UIButton buttonWithType:UIButtonTypeSystem];
    [bt setTitle:@"Next" forState:UIControlStateNormal];
    bt.frame = CGRectMake(240, 64, 80, 40);
    bt.backgroundColor = [UIColor yellowColor];
    //点击事件
    [bt addTarget:self action:@selector(push:) forControlEvents:UIControlEventTouchUpInside];
    //添加父试图
    [self.view addSubview:bt];
    //不释放
}

//自定义naviagtionBar
-(void)customNavigationBar
{
    self.navigationItem.title = @"firstVC";
    //设置rightbarbuttonitem
    //创建对象
    UIBarButtonItem *rightItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemCamera target:self action:@selector(rightItemAction:)];
    //赋值
    self.navigationItem.rightBarButtonItem = rightItem;
    
}
-(void)rightItemAction:(UIBarButtonItem *)rightItem

{
 
    NSLog(@"右边Ttem");
    //创建下一个控制器对象
    SecondViewController *scondVC = [[SecondViewController alloc]init];
    //视同导航视图控制器push下一个控制器
    [self.navigationController pushViewController:scondVC animated:YES];
    //释放
    [scondVC release];
}
-(void)push:(UIButton *)button
{
    //创建下一个试图控制器对象
    SecondViewController *secVC = [[SecondViewController alloc]init];
    //使用第一个试图控制器推出下一个跟试图控制器
    [self.navigationController pushViewController:secVC animated:YES];
    
    //释放
    [secVC release];
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/