#import "YYAppDelegate.h"
#import "YYOneViewController.h"

@implementation YYAppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.backgroundColor = [UIColor whiteColor];

//1.创建一个导航控制器
UINavigationController *nav=[[UINavigationController alloc]init];
//2.设置导航控制器为window的根视图
self.window.rootViewController=nav;

//3.添加子控制器到导航控制器中
//创建一些控制器
UIViewController *c1=[[UIViewController alloc]init];
//设置c1这个控制器的视图颜色
c1.view.backgroundColor=[UIColor redColor];

UIViewController *c2=[[UIViewController alloc]init];
c2.view.backgroundColor=[UIColor purpleColor];

UIViewController *c3=[[UIViewController alloc]init];
c3.view.backgroundColor=[UIColor brownColor];

//把这些控制器添加到导航控制器中
[nav pushViewController:c1 animated:YES];
[nav pushViewController:c2 animated:YES];
[nav pushViewController:c3 animated:YES];

[self.window makeKeyAndVisible];
return YES;
}

//
// YYOneViewController.m
// 01-导航控制器的使用1
//
// Created by apple on 14-6-4.
// Copyright (c) 2014年 itcase. All rights reserved.
//

#import "YYOneViewController.h"
#import "YYTwoViewController.h"

@interface YYOneViewController ()
/**
跳转到第二个界面
*/
- (IBAction)jump2two:(id)sender;

@end

@implementation YYOneViewController

- (IBAction)jump2two:(id)sender {
//1.创建第二个子控制器
YYTwoViewController *two=[[YYTwoViewController alloc]init];

//2.把子控制器添加到导航控制器中
//有什么办法能够拿到导航控制器？
//只要当前控制器是导航控制器的子控制器，那么就可以通过该属性直接获取到当前控制器所在的导航控制器
[self.navigationController pushViewController:two animated:YES];
}
@end

//
// YYTwoViewController.m
// 01-导航控制器的使用1
//
// Created by apple on 14-6-4.
// Copyright (c) 2014年 itcase. All rights reserved.
//

#import "YYTwoViewController.h"
#import "YYThreeViewController.h"
@interface YYTwoViewController ()
- (IBAction)jump2Three:(id)sender;

@end

@implementation YYTwoViewController

//跳转到第三个子控制器
- (IBAction)jump2Three:(id)sender {
//1.创建第三个子控制器
YYThreeViewController *three=[[YYThreeViewController alloc]init];
//2.将子控制器添加到导航控制器中
[self.navigationController pushViewController:three animated:YES];

}
@end