UINavigationController

/*
简单的应用UINavigationController
只是在两个界面之间添加了navigation栏，同时使用了UIBarButtonItem、UISegmentedControl
*/

//下边是delegate.h和.m文件
//两个自带xib的UIViewController分别是RootViewController和SecondViewController
#import <UIKit/UIKit.h>
#import "RootViewController.h"


@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) UINavigationController *navigationController;
@property (strong, nonatomic) RootViewController *rootViewController;



@end


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.rootViewController = [[RootViewController alloc] init];
    self.rootViewController.title = @"RootView";
    self.navigationController = [[UINavigationController alloc] init];
    [self.navigationController pushViewController:self.rootViewController animated:YES];
    [self.window addSubview:self.navigationController.view];
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    return YES;
}


/*
以下是RootViewController.m文件中的代码
SecondViewController里没有添加代码，只是作为一个被跳转过去的页面存在
*/

#import "RootViewController.h"

@interface RootViewController ()

@end

@implementation RootViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

//制作了一个在底部的UISegmentedControl,不足的是没有办法应用到每一个被跳转的页面（像微信主页面一样）
-(void) makeSegmentedControlOntheBottom
{
    NSArray *segmentContent = [[NSArray alloc] initWithObjects:@"微信",@"通讯录",@"发现",@"我",nil];
    UISegmentedControl *segment = [[UISegmentedControl alloc] initWithItems:segmentContent];
    segment.frame = CGRectMake(0, 440, 320, 40);
    segment.momentary = YES;//点击分段后是否弹回原状态，YES表示返回原状态，NO则被选中，高亮
    [self.view addSubview:segment];
    [segment addTarget:self action:@selector(clickTheSegmentOnthBottom:) forControlEvents:UIControlEventValueChanged];
}

//当点击segment的时候触发的事件（只写了第一和第三个的）
-(void) clickTheSegmentOnthBottom:(id)paramSender
{
    switch ([paramSender selectedSegmentIndex]) {
        
        case 0:
        {
            UIAlertView *alert = [[UIAlertView alloc]
                                  initWithTitle:@"选择" message:@"你选择了\"微信\""
                                  delegate:self
                                  cancelButtonTitle:@"是的"
                                  otherButtonTitles:nil, nil];
            [alert show];
        }
            break;
        case 2:
        {
            SecondViewController *secondeView = [[SecondViewController alloc] init];
            [self.navigationController pushViewController:secondeView animated:YES];
            secondeView.title = @"secondView";
        }
        break;
            
        default:
            break;
    }
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    //在navigation的bar上添加了一个右按钮
    UIBarButtonItem *rightButton = [[UIBarButtonItem alloc]
                                    initWithBarButtonSystemItem:UIBarButtonSystemItemAdd
                                    target:self action:@selector(selectRightBarButton:)];
    self.navigationItem.rightBarButtonItem = rightButton;
    [self makeSegmentedControlOntheBottom];
    
}

-(void) selectRightBarButton:(id)paramSender//右按钮执行的方法
{
    SecondViewController *secondViewController = [[SecondViewController alloc] init];
    [self.navigationController pushViewController:secondViewController animated:YES];
    secondViewController.title = @"SecondView";
}

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

@end