APPDelegate:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];

//创建主界面，导航栏的第一个页面

FirstViewController *fvc = [[FirstViewController alloc]init];

//创建一个导航栏控制器

UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:fvc];

nav.navigationBar.barTintColor = [UIColor redColor];

self.window.rootViewController = nav;//设置根控制器

[self.window makeKeyAndVisible];

return YES;

}

//给导航栏添加左右按钮

UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc]initWithTitle:@"cancel" style:UIBarButtonItemStyleDone target:nil action:nil];

self.navigationItem.leftBarButtonItem = cancelButton;

self.navigationItem.leftBarButtonItem.tintColor = [UIColor whiteColor];

UIBarButtonItem *nextButton = [[UIBarButtonItem alloc]initWithTitle:@"next" style:UIBarButtonItemStyleDone target:self action:@selector(goToSecond)];

self.navigationItem.rightBarButtonItem = nextButton ;

self.navigationItem.rightBarButtonItem.tintColor = [UIColor whiteColor];

UILabel *yLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 100, 44)];

yLabel.backgroundColor = [UIColor yellowColor];

yLabel.text = @"新浪";

yLabel.font = [UIFont systemFontOfSize:22];

yLabel.textColor = [UIColor redColor];

yLabel.textAlignment = NSTextAlignmentCenter;

self.navigationItem.titleView = yLabel;

-(void)goToSecond{

//创建即将显示的界面

SecondViewController *svc = [[SecondViewController alloc]init];

//使用导航栏控制器切换页面

//    [self.navigationController presentViewController:svc animated:YES completion:nil];

//push入栈 将当前的界面入栈，这个界面消失，将新的界面推送出来

//pop 将当前的界面消失，从栈上最上面的界面（最后一个界面）出栈

//设置默认提供的返回按钮的标题

UIBarButtonItem *backItem = [[UIBarButtonItem alloc]initWithTitle:@"返回" style:UIBarButtonItemStyleDone target:nil action:nil];

self.navigationItem.backBarButtonItem = backItem;

[self.navigationController showViewController:svc sender:self];

}

-(void)viewWillAppear:(BOOL)animated{

[super viewWillAppear:animated];

//显示工具栏

self.navigationController.toolbarHidden = NO;

self.navigationController.toolbar.barTintColor = [UIColor greenColor];

//默认工具栏高44，导航栏高44

//可以隐藏导航栏

//    self.navigationController.navigationBarHidden = YES;

}

SecondViewController类.m

-(void)viewDidLoad{

[super viewDidLoad];

UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];

[btn setTitle:@"back" forState:UIControlStateNormal];

btn.frame = CGRectMake(100, 200, 120, 50);

[btn addTarget:self action:@selector(goback) forControlEvents:UIControlEventTouchUpInside];

btn.tintColor = [UIColor whiteColor];

[self.view addSubview:btn];

}

-(void)goback{

//present 在现有的界面上盖上一层，dismissViewController删除

//如果之前使用 的push 那么用pop

[self.navigationController popViewControllerAnimated:YES];

[self dismissViewControllerAnimated:YES completion:nil];

}

拓：navigationbar 上加多个button：

UIView *rightBarView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 60, 31)];UIButton *phonebutton = [UIButton buttonWithType:UIButtonTypeCustom];phonebutton.frame=CGRectMake(0, 5, 25, 25);[phonebutton setImage:[UIImage imageNamed:@"phone.png"] forState:UIControlStateNormal];[phonebutton addTarget:self action:@selector(phoneclick)forControlEvents:UIControlEventTouchDown];[rightBarView addSubview:phonebutton];UIButton *mapbutton = [UIButton buttonWithType:UIButtonTypeCustom];[mapbutton setFrame:CGRectMake(30, 5, 25, 25)];[mapbutton setImage:[UIImage imageNamed:@"c_address.png"] forState:UIControlStateNormal];[mapbutton addTarget:self action:@selector(mapclick)forControlEvents:UIControlEventTouchDown];[rightBarView addSubview:phonebutton];[rightBarView addSubview:mapbutton];rightBarView.backgroundColor=[UIColor clearColor];UIBarButtonItem *rightBtn = [[UIBarButtonItem alloc]initWithCustomView:rightBarView];self.navigationItem.rightBarButtonItem = rightBtn;

更简便的方法：