UI1_UINavigationController

//
//  FourthViewController.h
//  UI1_UINavigationController
//
//  Created by zhangxueming on 15/7/6.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface FourthViewController : UIViewController

@end

//
//  FourthViewController.m
//  UI1_UINavigationController
//
//  Created by zhangxueming on 15/7/6.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "FourthViewController.h"

@interface FourthViewController ()

@end

@implementation FourthViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.view.backgroundColor = [UIColor purpleColor];
    //视图控制器数组
    NSInteger count = [self.navigationController.viewControllers count];
    NSLog(@"count = %li", count);

    UIButton *btn1 = [UIButton buttonWithType:UIButtonTypeSystem];
    btn1.frame = CGRectMake(100, 100, self.view.frame.size.width-200, 50);
    [btn1 setTitle:@"popToFirst" forState:UIControlStateNormal];
    btn1.titleLabel.font = [UIFont boldSystemFontOfSize:24];
    [btn1 addTarget:self action:@selector(btnClicked:) forControlEvents:UIControlEventTouchUpInside];
    btn1.tag = 100;
    [self.view addSubview:btn1];

    UIButton *btn2 = [UIButton buttonWithType:UIButtonTypeSystem];
    btn2.frame = CGRectMake(100, 200, self.view.frame.size.width-200, 50);
    [btn2 setTitle:@"popToSecond" forState:UIControlStateNormal];
    btn2.titleLabel.font = [UIFont boldSystemFontOfSize:24];
    [btn2 addTarget:self action:@selector(btnClicked:) forControlEvents:UIControlEventTouchUpInside];
    btn2.tag = 101;
    [self.view addSubview:btn2];
}

- (void)btnClicked:(UIButton *)btn
{
    if (btn.tag==100) {
        //直接切换到根视图控制器
        [self.navigationController popToRootViewControllerAnimated:YES];
    }
    else if (btn.tag==101)
    {
        //获取指定位置的视图控制器
        //视图控制器必须存在
        UIViewController *controller = [self.navigationController.viewControllers objectAtIndex:1];
        [self.navigationController popToViewController:controller animated:YES];
    }
}

- (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.
}
*/

@end

//
//  ThirdViewController.h
//  UI1_UINavigationController
//
//  Created by zhangxueming on 15/7/6.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface ThirdViewController : UIViewController

@end

//
//  ThirdViewController.m
//  UI1_UINavigationController
//
//  Created by zhangxueming on 15/7/6.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "ThirdViewController.h"
#import "FourthViewController.h"

@interface ThirdViewController ()

@end

@implementation ThirdViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.view.backgroundColor = [UIColor redColor];

    UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];
    btn.frame = CGRectMake(100,200, self.view.frame.size.width-200, 50);
    [btn setTitle:@"pushToFourth" forState:UIControlStateNormal];
    [btn addTarget:self action:@selector(btnClicked) forControlEvents:UIControlEventTouchUpInside];
    btn.titleLabel.font = [UIFont boldSystemFontOfSize:24];
    [self.view addSubview:btn];

    NSLog(@"count = %li", self.navigationController.viewControllers.count);
}

- (void)btnClicked
{
    FourthViewController *fvc = [[FourthViewController alloc] init];
    [self.navigationController pushViewController:fvc animated:YES];

}

- (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.
}
*/

@end

//
//  SecondViewController.h
//  UI1_UINavigationController
//
//  Created by zhangxueming on 15/7/6.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface SecondViewController : UIViewController

@end

//
//  SecondViewController.m
//  UI1_UINavigationController
//
//  Created by zhangxueming on 15/7/6.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "SecondViewController.h"
#import "ThirdViewController.h"

@interface SecondViewController ()

@end

@implementation SecondViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.view.backgroundColor = [UIColor yellowColor];
    UIButton *btn1 = [UIButton buttonWithType:UIButtonTypeSystem];
    btn1.frame = CGRectMake(100, 100, self.view.frame.size.width-200, 50);
    [btn1 setTitle:@"pushToThird" forState:UIControlStateNormal];
    btn1.titleLabel.font = [UIFont boldSystemFontOfSize:23];
    [btn1 addTarget:self action:@selector(btnClicked:) forControlEvents:UIControlEventTouchUpInside];
    btn1.tag = 100;
    [self.view addSubview:btn1];

    UIButton *btn2= [UIButton buttonWithType:UIButtonTypeSystem];
    btn2.frame = CGRectMake(100, 300, self.view.frame.size.width-200, 50);
    [btn2 setTitle:@"popToFirst" forState:UIControlStateNormal];
    btn2.titleLabel.font = [UIFont boldSystemFontOfSize:24];
    [btn2 addTarget:self action:@selector(btnClicked:) forControlEvents:UIControlEventTouchUpInside];
    btn2.tag = 101;
    [self.view addSubview:btn2];
}

- (void)btnClicked:(UIButton *)btn
{
    //压栈
    if (btn.tag == 100) {
        ThirdViewController *tvc = [[ThirdViewController alloc] init];
        [self.navigationController  pushViewController:tvc animated:YES];
    }
    else if(btn.tag == 101)
    {
        //出栈
        //栈顶的视图控制器出栈
        [self.navigationController popViewControllerAnimated:YES];
    }

}
- (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.
}
*/

@end

//
//  AppDelegate.m
//  UI1_UINavigationController
//
//  Created by zhangxueming on 15/7/6.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "AppDelegate.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch
    //创建导航控制器
    UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:self.window.rootViewController];
    self.window.rootViewController = nav;
    return YES;
}

//
//  ViewController.m
//  UI1_UINavigationController
//
//  Created by zhangxueming on 15/7/6.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "ViewController.h"
#import "SecondViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.view.backgroundColor = [UIColor cyanColor];

    UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];
    btn.frame = CGRectMake(100, 200, self.view.frame.size.width-200, 50);
    [btn setTitle:@"push" forState:UIControlStateNormal];
    btn.titleLabel.font = [UIFont boldSystemFontOfSize:24];

    [btn addTarget:self action:@selector(btnClicked) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn];
}

- (void)btnClicked
{
    SecondViewController *svc = [[SecondViewController alloc] init];
    //取得导航控制器对象
    //视图控制器必须被添加到导航控制器中
    //把视图控制器压栈到导航控制器中
    [self.navigationController pushViewController:svc animated:YES];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end