本文将分析一下OSChina iOS客户端程序的主框架实现，并在尝试整理了一个最简单的框架。

      1、在AppDelegate中创建多个UINavigationController,将这些UINavigationController添加到一个UITabBarController上,最后将UITabBarController设置为self.window的rootController。代码如下:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];        //1.创建多个UINavigationController    NewsBase *newsBase = [[NewsBase alloc]initWithNibName:@"NewsBase" bundle:nil];    UINavigationController *newsNav =    [[UINavigationController alloc]initWithRootViewController:newsBase];    PostBase *postBase = [[PostBase alloc]initWithNibName:@"PostBase" bundle:nil];    UINavigationController *postNav =    [[UINavigationController alloc]initWithRootViewController:postBase];        //设置UITabBarController的tabBarItem的显示效果    newsNav.tabBarItem.title = @"综合";    postNav.tabBarItem.title = @"问答";        //2.将UINavigationController添加到UITabBarController上    UITabBarController *mainTab =     [[UITabBarController alloc]init];    mainTab.viewControllers = [NSArray arrayWithObjects:newsNav,postNav, nil];        //3.将UITabBarController设置为window的rootViewController    self.window.rootViewController = mainTab;        self.window.backgroundColor = [UIColor whiteColor];    [self.window makeKeyAndVisible];    return YES;}

     一个UINavigationController的rootViewController，NewsBase.h:

#import 
    
     #import "NewsListController.h" @interface NewsBase : UIViewController//包含UITableView的ViewController@property (strong,nonatomic) NewsListController *newsListControl;@property (strong,nonatomic) UISegmentedControl*segment;@end
    

- (void)viewDidLoad{    [super viewDidLoad];        //1.将持有的NewsListController的View添加到本界面的view中    newsListControl = [[NewsListController alloc]init];    newsListControl.catalog = 0;    [self addChildViewController:newsListControl];    [self.view addSubview:newsListControl.view];    self.newsListControl.view.frame = self.view.bounds;    self.newsListControl.view.autoresizingMask =    UIViewAutoresizingFlexibleHeight |    UIViewAutoresizingFlexibleWidth;        //2.初始化UISegmentController    NSArray *segmentTextContent = [NSArray arrayWithObjects:@"咨询",@"博客",                                   @"推荐阅读", nil];    self.segment = [[UISegmentedControl alloc]initWithItems:segmentTextContent];    self.segment.selectedSegmentIndex = 0;        self.segment.segmentedControlStyle =    UISegmentedControlStyleBar;    segment.frame = CGRectMake(0, 0, 300, 30);        //为UISegmentedControler注册切换segment事件    [segment addTarget:self action:@selector(segmentAction:) forControlEvents:UIControlEventValueChanged];        //将UISegmentedController设置为UISegmentedController的titleView    self.navigationItem.titleView = self.segment;}-(void)segmentAction:(id)sender {    //调用持有的NewsViewController对象上的载入列表数据方法    //需要注意的是子页面中包含一个UITableView对象，    [self.newsListControl reloadWithSegmentIndex:self.segment.selectedSegmentIndex];    NSLog(@"segmentchanged");    }

     上面代码中有一点本人需要注意的是“1.将持有的NewsListController的View添加到本界面的view中”，其中的[self addChildViewController:xxx]这个API，说实话，我以前没有看到过。

     3、在包含UITable的ViewController中，主要实现的就是数据的请求与加载，这些都需要配合网络数据请求以及下拉组件(EGORefreshTableHeaderView)来实现，这些会在后面的文章中加以介绍，为了使文件更加简洁，现在都用简单的测试数据模拟一下。在这个ViewController中，主要是向外开放了一个根据当前UISegment的选择状态来刷新数据的方法(reloadWithSegmentIndex)，使得parentViewController能够进行控制。

     包含UITableView的控制器NewsListController.h：

#import 
    
     @interface NewsListController : UIViewController
     
      //UITableView引用@property (nonatomic,strong) IBOutlet UITableView*newsTable;//列表数据@property (nonatomic,strong) NSMutableArray *news;@property NSInteger catalog;//根据成员变脸segmentIndex调用刷新数据方法-(void)reloadWithSegmentIndex:(NSInteger)segmentIndex;@end
     
    

- (void)viewDidLoad{    [super viewDidLoad];        newsTable.delegate = self;    newsTable.dataSource = self;        [self reloadWithSegmentIndex:catalog];}/** *根据当前segment选中的位置来切换列表数据 */-(void)reloadWithSegmentIndex:(NSInteger)segmentIndex {    //1.清除当前列表数据    if(news == nil) {        news = [[NSMutableArray alloc]initWithCapacity:20];    }    [news removeAllObjects];        //2.添加测试数据    for(int i=0;i<20;i++) {        [news insertObject:[NSString stringWithFormat:@"列表%d,置%d",segmentIndex,i] atIndex:i];    }        [newsTable reloadData];}#pragma mark -- UITable DataSource-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {    return 20;}-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {        NSString *cellTag = @"cellTag";    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellTag];    if(cell == nil) {        cell = [[UITableViewCell alloc]init];    }    UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(30, 0, 120, 40)];        [label setText:[news objectAtIndex:indexPath.row]];    [cell addSubview:label];    return cell;}

     东西写的可能不好，但是写完以后，心里会有一种踏实的感觉，，

     工程地址:

     O啦~~~

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     谢谢!!