@implementation HMAppDelegate

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

{

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

    // Override point for customization after application launch.

    self.window.backgroundColor = [UIColor whiteColor];

    HMOneViewController *oneVc = [[HMOneViewController alloc] init];

    UINavigationController *navVc = [[UINavigationController alloc] initWithRootViewController:oneVc];

    self.window.rootViewController = navVc;

    [self.window makeKeyAndVisible];

    return YES;

}

-(void)test1{

    //1.创建一个导航控制器

    //UINavigationController *navVc = [[UINavigationController alloc] init];

    //2.设置导航控制器的子控制器

    UIViewController *oneVc = [[UIViewController alloc] init];

    oneVc.view.backgroundColor  = [UIColor grayColor];

    UIViewController *twoVc = [[UIViewController alloc] init];

    twoVc.view.backgroundColor = [UIColor purpleColor];

    //method 1 : 添加导航控制器的子控制器

    //[navVc pushViewController:oneVc animated:YES];

    //[navVc pushViewController:twoVc animated:YES];

    //method 2

    //navVc.viewControllers = @[oneVc];

    //method 3

    //    [navVc addChildViewController:oneVc];

    //    [navVc addChildViewController:twoVc];

    //self.window.rootViewController = navVc;

}

#import "HMOneViewController.h"

#import "HMTwoViewController.h"

@interface HMOneViewController ()

- (IBAction)jumpTwoVc:(id)sender;

@end

@implementation HMOneViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

{

    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

    if (self) {

        // Custom initialization

    }

    return self;

}

- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view from its nib.

    //NSLog(@"%@",self.navigationController.viewControllers);

    //设置导航栏的内容

    //设置标题

    self.navigationItem.title = @"第一个控制器";

    //设置导航栏左边的按钮

    UIBarButtonItem *leftBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCamera target:nil action:nil];

    self.navigationItem.leftBarButtonItem = leftBtn;

    //设置下一个控制器的返回按钮

    //当前控制的navigationItem里的返回按钮是决定下一个控制器的返回按钮

    self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"返回" style:UIBarButtonItemStylePlain target:nil action:nil];

}

- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

//跳到第二个控制器

- (IBAction)jumpTwoVc:(id)sender {

    HMTwoViewController *twoVc = [[HMTwoViewController alloc] init];

    NSLog(@"%@",self.navigationController);

    [self.navigationController pushViewController:twoVc animated:YES];

}

@end

#import "HMTwoViewController.h"

#import "HMThreeViewController.h"

@interface HMTwoViewController ()

- (IBAction)backOneVc:(id)sender;

- (IBAction)jumpThreeVc;

@end

@implementation HMTwoViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

{

    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

    if (self) {

        // Custom initialization

    }

    return self;

}

- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view from its nib.

    //NSLog(@"%@",self.navigationController.viewControllers);

    //设置标题

    self.navigationItem.title = @"第二个控制器";

    //设置返回按钮

    self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"BACK" style:UIBarButtonItemStylePlain target:nil action:nil];

    //设置导航栏左边的按钮

    //如果设置leftBarButtonItem ，之前那个返回无效

    UIBarButtonItem *leftBtnItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemReply target:self  action:@selector(back)];

    self.navigationItem.leftBarButtonItem = leftBtnItem;

    //设置导航栏右边的按钮

    UIBarButtonItem *search = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemSearch target:nil action:nil];

    //self.navigationItem.rightBarButtonItem = search;

    UIBarButtonItem *refresh = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh target:nil action:nil];

    self.navigationItem.rightBarButtonItems = @[search,refresh];

}

//返回上一个控制器

-(void)back{

    [self.navigationController popViewControllerAnimated:YES];

}

- (IBAction)backOneVc:(id)sender {

    [self.navigationController popViewControllerAnimated:YES];

}

- (IBAction)jumpThreeVc {

    //跳到第三个控制器

    HMThreeViewController *threeVc = [[HMThreeViewController alloc] init];

    [self.navigationController pushViewController:threeVc animated:YES];

}

@end

#import "HMThreeViewController.h"

@interface HMThreeViewController ()

- (IBAction)backOneVc:(id)sender;

@end

@implementation HMThreeViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

{

    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

    if (self) {

        // Custom initialization

    }

    return self;

}

- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view from its nib.

    //栈的所有控制器

    NSLog(@"%@",self.navigationController.viewControllers);

    NSArray *array = [self.navigationController childViewControllers];

    NSLog(@"%@",array);

    //设置标题View

    UIButton *btn = [UIButton buttonWithType:UIButtonTypeContactAdd];

    self.navigationItem.titleView = btn;

    //设置返回按钮btn_back_normal

    UIButton  *redBtn = [UIButton buttonWithType:UIButtonTypeCustom];

    redBtn.bounds =  CGRectMake(, , , );

    [redBtn setBackgroundImage:[UIImage imageNamed:@"btn_back_normal"] forState:UIControlStateNormal];

    [redBtn addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];

    UIBarButtonItem *redBackBtnItem = [[UIBarButtonItem alloc] initWithCustomView:redBtn];

    self.navigationItem.leftBarButtonItem = redBackBtnItem;

}

//返回上一个控制咕噜

-(void)back{

    [self.navigationController popViewControllerAnimated:YES];

}

- (IBAction)backOneVc:(id)sender {

    //返回第一个控制器

    //[self.navigationController popToRootViewControllerAnimated:YES];

    //获取第一个控制器

    UIViewController *oneVC = self.navigationController.viewControllers[];

    //返回指定控制器

    [self.navigationController popToViewController:oneVC animated:YES];

}

@end