webView(简单的浏览器)

 1 #import "MJViewController.h"
 2 
 3 @interface MJViewController () <UISearchBarDelegate, UIWebViewDelegate>
 4 
 5 @property (weak, nonatomic) IBOutlet UIWebView *webView;
 6 @property (weak, nonatomic) IBOutlet UIBarButtonItem *backButton;
 7 @property (weak, nonatomic) IBOutlet UIBarButtonItem *forwarButton;
 8 
 9 @end
10 
11 @implementation MJViewController
12 
13 - (void)viewDidLoad
14 {
15     [super viewDidLoad];
16 
17     [self loadString:@"http://m.baidu.com"];
18 }
19 
20 // 让浏览器加载指定的字符串,使用m.baidu.com进行搜索
21 - (void)loadString:(NSString *)str
22 {
23     // 1. URL 定位资源,需要资源的地址
24     NSString *urlStr = str;
25     if (![str hasPrefix:@"http://"]) {
26         urlStr = [NSString stringWithFormat:@"http://m.baidu.com/s?word=%@", str];
27     }
28     
29     NSURL *url = [NSURL URLWithString:urlStr];
30     
31     // 2. 把URL告诉给服务器,请求,从m.baidu.com请求数据
32     NSURLRequest *request = [NSURLRequest requestWithURL:url];
33     
34     // 3. 发送请求给服务器
35     [self.webView loadRequest:request];
36 }
37 
38 #pragma mark - 搜索栏代理
39 // 开始搜索
40 - (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar
41 {
42     NSLog(@"%@", searchBar.text);
43     [self loadString:searchBar.text];
44     
45     [self.view endEditing:YES];
46 }
47 
48 // 文本改变
49 - (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
50 {
51     NSLog(@"searchText - %@", searchText);
52 }
53 
54 #pragma mark - WebView代理方法
55 #pragma mark 完成加载,页面链表数据会更新
56 - (void)webViewDidFinishLoad:(UIWebView *)webView
57 {
58     // 根据webView当前的状态,来判断按钮的状态
59     self.backButton.enabled = webView.canGoBack;
60     self.forwarButton.enabled = webView.canGoForward;
61 }
62 
63 @end