UI_NavigationController

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#import "AppDelegate.h"

#import "MainViewController.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

- (void)dealloc

{

[_windowrelease];

[superdealloc];

}

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

self.window = [[UIWindowalloc] initWithFrame:[[UIScreenmainScreen] bounds]];

// Override point for customization after application launch.

self.window.backgroundColor = [UIColorwhiteColor];

[self.windowmakeKeyAndVisible];

[_windowrelease];

MainViewController *mainVC = [[MainViewControlleralloc] init];

//导航控制器的使用

//创建导航控制器的时候指定一个栈底控制器(rootVC)

UINavigationController *navi = [[UINavigationControlleralloc] initWithRootViewController:mainVC];

//把导航控制器指定为window的根视图控制器

self.window.rootViewController = navi;

[mainVCrelease];

[navirelease];

return YES;

}

#import "MainViewController.h"

#import "SecondViewController.h"

@interface MainViewController ()

@end

@implementation MainViewController

- (void)viewDidLoad {

[superviewDidLoad];

// Do any additional setup after loading the view.

self.title =@"第一页";

// 设置NavigationBar 导航栏

//导航栏对每个导航控制器都是唯一的

// 获取导航栏对象

// 1. 改变导航栏的颜色

// self.navigationController.navigationBar.barTintColor = [UIColor greenColor];

// 2.改变导航栏的半透明度效果,会相应的改变VC的view的坐标系起点

// self.navigationController.navigationBar.translucent = YES;

// 3. 隐藏导航栏

// self.navigationController.navigationBarHidden = YES;

// navigationItem

//保存按钮信息的一个类,每个VC都有一个这个类的属性,用来保存显示在导航栏上的按钮信息

// 右侧的按钮 right

self.navigationItem.rightBarButtonItem = [[[UIBarButtonItemalloc] initWithBarButtonSystemItem:UIBarButtonSystemItemTrashtarget:selfaction:@selector(barButtonAction:)]autorelease];

// 中间的自定义视图 titleView

// UISegmentedControl *seg = [[UISegmentedControl alloc] initWithItems:@[@"1",@"2"]];

// self.navigationItem.titleView = seg;

// [seg release];

self.view.backgroundColor = [UIColorredColor];

UIButton *button = [UIButtonbuttonWithType:UIButtonTypeSystem];

button.frame =CGRectMake(20,120, 335, 40);

button.backgroundColor = [UIColoryellowColor];

[button setTitle:@"推出第二页"forState:UIControlStateNormal];

[button addTarget:selfaction:@selector(buttonAction:)forControlEvents:UIControlEventTouchUpInside];

[self.viewaddSubview:button];

}

- (void)barButtonAction:(UIBarButtonItem *)item

{

NSLog(@"导航栏按钮");

}

- (void)buttonAction:(UIButton *)btn

{

NSLog(@"点击");

// 使用导航控制器push一个新的VC

// (约定VC代表视图控制器(viewController))

// 1.创建一个新的VC对象

SecondViewController *secondVC = [[SecondViewControlleralloc] init];

// 2.使用导航控制器push新的VC

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

// 3.内存管理

[secondVCrelease];

}

#import "ForthViewController.h"

@interface ForthViewController ()

@end

@implementation ForthViewController

- (void)viewDidLoad {

[superviewDidLoad];

// Do any additional setup after loading the view.

self.view.backgroundColor = [UIColorpurpleColor];

UIButton *button = [UIButtonbuttonWithType:UIButtonTypeSystem];

button.frame =CGRectMake(20,120, 335, 40);

button.backgroundColor = [UIColoryellowColor];

[button setTitle:@"返回"forState:UIControlStateNormal];

[button addTarget:selfaction:@selector(buttonAction:)forControlEvents:UIControlEventTouchUpInside];

[self.viewaddSubview:button];

}

- (void)buttonAction:(UIButton *)btn

{

// 使用导航控制器出栈(pop)

// 1.返回首页

// [self.navigationController popToRootViewControllerAnimated:YES];

// 2. 返回上一页

// [self.navigationController popViewControllerAnimated:YES];

// 3.返回栈里面的某一页

UIViewController *vc1 = [self.navigationController.viewControllersobjectAtIndex:1];

[self.navigationControllerpopToViewController:vc1 animated:YES];

}

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