UINavigationController是IOS編程中比較常用的一種容器view controller，也就是導航欄控制器。

1.創建一個UINavigationController

    self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];   
    FirstViewController * first = [[FirstViewController alloc]init];    
    UINavigationController * nav = [[UINavigationControlleralloc]initWithRootViewController:first];  //UINavigationController第一個顯示的界面
    self.window.rootViewController = nav;
    [self.window makeKeyAndVisible];

2.隱藏導航欄工具欄

    self.navigationController.navigationBarHidden = YES;
    self.navigationController.toolbarHidden = NO;

3.設置導航欄和工具欄的顏色（設置了之后所有都是這個顏色，因為只有一個navigationController）

    self.navigationController.toolbar.barTintColor = [UIColor redColor];
    self.navigationController.navigationBar.barTintColor = [UIColor redColor];

4.設置左右顯示的按鈕

    UIBarButtonItem * leftBtn = [[UIBarButtonItem alloc]initWithTitle:@"Cancel" style:UIBarButtonItemStyleDonetarget:nil action:nil];
    self.navigationItem.leftBarButtonItem = leftBtn;
    self.navigationItem.leftBarButtonItem.tintColor = [UIColor whiteColor];
    
    UIBarButtonItem * rightBtn = [[UIBarButtonItem alloc]initWithTitle:@"Next" style:UIBarButtonItemStyleDonetarget:self action:@selector(gotoSecondView)];
    self.navigationItem.rightBarButtonItem = rightBtn;
    self.navigationItem.rightBarButtonItem.tintColor = [UIColor whiteColor];

5.設置標題

    self.navigationItem.title =@"標題";
    self.navigationBar.titleTextAttributes = @{NSFontAttributeName:[UIFontsystemFontOfSize:16],NSForegroundColorAttributeName:[UIColor whiteColor]};

6.標題位置設置成view

    UIView * view = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 100, 44)];
    view.backgroundColor = [UIColor yellowColor];
    self.navigationItem.titleView = view;

7.Next按鈕響應第二個界面

-(void)gotoSecondView{
    SecondViewController * svc = [[SecondViewController alloc]init];
    //設置默認提供的返回按鈕的標題
    UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithTitle:@"返回" style:UIBarButtonItemStyleDone target:nil action:nil];
    self.navigationItem.backBarButtonItem = backItem;
    //present：在現有的界面上蓋上一層 dismissViewController來消除
    //[self.navigationController presentViewController:svc animated:YES completion:nil];
    //push：push入棧 pop出棧來消除
    [self.navigationController pushViewController:svc animated:YES];
}