创建一个window,一个视图,一个导航,视图作为导航的根视图,导航作为window的根视图.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {// 创建一个windowself.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];// 创建一个ViewControllerViewController *vc = [[ViewController alloc] init];// 创建一个导航 ViewController 要使用 pushViewController 跳转页面就必须要创建一个Navigation,然后使 ViewController 入栈UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:vc];// 设置根视图控制器self.window.rootViewController = navigationController;// 这个是便捷方法，去使被使用对象的主窗口显示到屏幕的最前端。你也可以使用hiddenUIView方法隐藏这个窗口(这是文档说法)[self.window makeKeyAndVisible];return YES;
}

ViewController.m

#pragma mark cell被选中调用此消息
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{// 创建第二个视图DishViewController *DishVC = [[DishViewController alloc] init];// 赋值给dishs做到传值DishVC.dishs = [self.datas valueForKey:[self.datas.allKeys objectAtIndex:indexPath.row]];// 给导航栏赋值DishVC.title = [self.datas.allKeys objectAtIndex:indexPath.row];//self 必须在navigation栈中,self.navigationController才不会为空[self.navigationController pushViewController:DishVC animated:YES]; // 跳转....// 这句代码好像可以直接跳转而不必设置Navigation
//    [self presentViewController:DishVC animated:YES completion:nil];/*使用通知同样可以传值*/
}

DishViewController.m

@property (nonatomic, retain) NSArray *dishs; // 菜
@property (nonatomic, retain) UITableView *tableView;
@property (nonatomic, retain) id<URLDelegate> delegate; //委托

// 显示右边的小箭头[cell setAccessoryType:UITableViewCellAccessoryDisclosureIndicator];

实现: - (void)tableView:didSelectRowAtIndexPath:

#pragma mark 选中cell触发此消息
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{row = indexPath.row; // 记录选中的行webViewController = [[WebViewController alloc] init]; //self.delegate = webViewController; // 设置代理webViewController.nameOfDish = [[self.dishs objectAtIndex:row] valueForKey:@"name"];// 询问是否是使用系统自带的浏览器[[[UIAlertView alloc] initWithTitle:@"选择" message:@"是否使用系统浏览器" delegate:self cancelButtonTitle:@"NO" otherButtonTitles:@"OK", nil] show];
}

实现:- (void)alertView:clickedButtonAtIndex:

#pragma mark 对alertView的响应
/*buttonIndex的值会根据按钮的顺序从0增加.0,1,2,3....*/
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{if (buttonIndex == 0) {// 设置标题webViewController.title = webViewController.nameOfDish;// 跳转页面[self.navigationController pushViewController:webViewController animated:YES];}else{// 代理if ([self.delegate respondsToSelector:@selector(openBowser)]) {[self.delegate openBowser];}}
}

添加协议:

@protocol URLDelegate <NSObject>
#pragma mark 加工访问web的url
- (NSString *) urlstring:(NSString*) nameOfDish;
#pragma mark 调用系统自带的浏览器
- (void) openBowser;
@end

WebViewController

@interface WebViewController : UIViewController<URLDelegate>
@property (nonatomic, retain) NSString *nameOfDish; // 菜名
@property (nonatomic, retain) UIWebView *webView;
@end

WebViewController.m:

@implementation WebViewController- (void)viewDidLoad {[super viewDidLoad];[self buildWebView];[self loadWebPageWithString:[self urlstring:self.nameOfDish]];
}#pragma mark 创建一个WebView
- (void)buildWebView{// 初始化WebViewself.webView = [[UIWebView alloc] initWithFrame:self.view.bounds];// 自动对页面进行缩放以适应屏幕[self.webView setScalesPageToFit:YES];[self.view addSubview:self.webView];
}#pragma maek 加载一个页面
- (void)loadWebPageWithString:(NSString *) urlstring{// 把string转成urlNSURL *url = [NSURL URLWithString:urlstring];// 加载页面需要NSURLRequestNSURLRequest *request = [NSURLRequest requestWithURL:url];[self.webView loadRequest:request];
}#pragma mark 加工访问web的url
- (NSString *) urlstring:(NSString*) nameOfDish{//ios中http请求遇到汉字的时候，需要转化成UTF-8，用到的方法是：nameOfDish = [nameOfDish stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];// 百度没有提供搜索接口,不过可以使用链接异步得到结果return [NSString stringWithFormat:@"http://www.baidu.com/s?wd=%@&cl=3",nameOfDish];
}#pragma mark 调用系统自带的浏览器
- (void)openBowser{NSURL *url = [NSURL URLWithString:[self urlstring:self.nameOfDish]];// 调用系统..[[UIApplication sharedApplication] openURL:url];
}
@end