UIWebView 操做

網絡開發中，當公司已經使用 HTML5 技術實現同時適應 Android 和 iOS 等多個平臺的網頁時，這時每每須要咱們 iOS 平臺可以嵌入網頁並進行各類交互，那咱們應該怎麼作來實現這種需求呢？

這裏咱們考慮的方案就是：使用 UIWebView 網頁控件

 

然而考慮使用 UIWebView 進行混合編程的場景特色有：

（1）排版複雜：一般包括圖片和文字的混排，還有可能包括連接須要支持點擊操做。若是本身用原生控件拼裝實現，因爲界面元素過多，作起來會很困難。就算是使用 CoreText 來實現，也須要本身實現至關多的複雜排版邏輯。

（2）界面的變更需求頻繁：例如淘寶 App 的彩票頁面，可能經常須要更新界面以推出不一樣的活動。採用 UIWebView 嵌套頁面實現後，這類頁面不須要向 App Store 提交新的版本就能夠動態地更新，而原生控件實現的界面很難達到如此高的靈活性。

（3）界面對用戶的交互需求不復雜：由於 UIWebView 實現的交互效果與原生效果相比仍是會大打折扣，因此這類界面一般都沒有複雜的交互效果。這也是主流 App 大多采用混合 UIWebView 來實現界面而不是使用純 UIWebView 來實現界面的緣由之一，另外的緣由是純 UIWebView 實現的性能也沒原生的好，並且純 UIWebView 實現的話根本沒法經過 App Store 的審覈，他會建議您搞 Web App。

 

本隨筆簡單介紹如何使用 UIWebView 網頁控件：

（1）簡單瀏覽器

• file://WhatsNewIniPhoneOS.pdf 讀取本地資源文件

• http://www.apple.com 讀取網站內容

• KenmuHuang 讀取百度搜索網站相關查詢內容

（2）頁面交互；能夠考慮使用模版引擎庫 GRMustache：https://github.com/groue/GRMustache，方便閱讀和更改渲染內容

（3）頁面調用 OC 方法；能夠考慮使用 JS 與 OC 交互庫「WebViewJavascriptBridge」：https://github.com/marcuswestin/WebViewJavascriptBridge，方便 JS 與 OC 之間發送消息進行交互

 

效果以下：

 

 

ViewController.h

1 #import <UIKit/UIKit.h>
2 
3 @interface ViewController : UITableViewController
4 @property (copy, nonatomic) NSArray *arrSampleName;
5 
6 - (instancetype)initWithSampleNameArray:(NSArray *)arrSampleName;
7 
8 @end 

ViewController.m

 1 #import "ViewController.h"
 2 #import "SimpleBrowserViewController.h"
 3 #import "PageInteractionViewController.h"
 4 #import "PageCallOCFunctionViewController.h"
 5 
 6 @interface ViewController ()
 7 - (void)layoutUI;
 8 @end
 9 
10 @implementation ViewController
11 - (void)viewDidLoad {
12     [super viewDidLoad];
13     
14     [self layoutUI];
15 }
16 
17 - (void)didReceiveMemoryWarning {
18     [super didReceiveMemoryWarning];
19     // Dispose of any resources that can be recreated.
20 }
21 
22 - (instancetype)initWithSampleNameArray:(NSArray *)arrSampleName {
23     if (self = [super initWithStyle:UITableViewStyleGrouped]) {
24         self.navigationItem.title = @"UIWebView 操做";
25         self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"返回" style:UIBarButtonItemStylePlain target:nil action:nil];
26         
27         _arrSampleName = arrSampleName;
28     }
29     return self;
30 }
31 
32 - (void)layoutUI {
33     
34 }
35 
36 #pragma mark - UITableViewController相關方法重寫
37 - (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {
38     return 0.1;
39 }
40 
41 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
42     return 1;
43 }
44 
45 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
46     return [_arrSampleName count];
47 }
48 
49 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
50     static NSString *cellIdentifier = @"cell";
51     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
52     if (!cell) {
53         cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
54     }
55     cell.textLabel.text = _arrSampleName[indexPath.row];
56     return cell;
57 }
58 
59 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
60     switch (indexPath.row) {
61         case 0: {
62             SimpleBrowserViewController *simpleBrowserVC = [SimpleBrowserViewController new];
63             [self.navigationController pushViewController:simpleBrowserVC animated:YES];
64             break;
65         }
66         case 1: {
67             PageInteractionViewController *pageInteractionVC = [PageInteractionViewController new];
68             [self.navigationController pushViewController:pageInteractionVC animated:YES];
69             break;
70         }
71         case 2: {
72             PageCallOCFunctionViewController *pageCallOCFunctionVC = [PageCallOCFunctionViewController new];
73             [self.navigationController pushViewController:pageCallOCFunctionVC animated:YES];
74             break;
75         }
76         default:
77             break;
78     }
79 }
80 
81 @end 

PrefixHeader.pch

1 #define kTitleOfSimpleBrowser @"簡單瀏覽器"
2 #define kTitleOfPageInteraction @"頁面交互"
3 #define kTitleOfPageCallOCFunction @"頁面調用 OC 方法"
4 
5 #define kApplication [UIApplication sharedApplication] 

SimpleBrowserViewController.h

 1 #import <UIKit/UIKit.h>
 2 
 3 @interface SimpleBrowserViewController : UIViewController <UISearchBarDelegate, UIWebViewDelegate>
 4 @property (strong, nonatomic) UISearchBar *searchBar;
 5 @property (strong, nonatomic) UIWebView *webView;
 6 @property (strong, nonatomic) UIToolbar *toolbar;
 7 @property (strong, nonatomic) UIBarButtonItem *barBtnBack;
 8 @property (strong, nonatomic) UIBarButtonItem *barBtnForward;
 9 
10 @end 

SimpleBrowserViewController.m

  1 #import "SimpleBrowserViewController.h"
  2 
  3 @interface SimpleBrowserViewController ()
  4 - (void)webViewBack;
  5 - (void)webViewForward;
  6 - (void)layoutUI;
  7 - (void)sendRequest:(NSString *)requestURLStr;
  8 - (void)changeBarButtonStatus;
  9 @end
 10 
 11 @implementation SimpleBrowserViewController
 12 
 13 - (void)viewDidLoad {
 14     [super viewDidLoad];
 15     
 16     [self layoutUI];
 17 }
 18 
 19 - (void)didReceiveMemoryWarning {
 20     [super didReceiveMemoryWarning];
 21     // Dispose of any resources that can be recreated.
 22 }
 23 
 24 - (void)webViewBack {
 25     [_webView goBack];
 26 }
 27 
 28 - (void)webViewForward {
 29     [_webView goForward];
 30 }
 31 
 32 - (void)layoutUI {
 33     self.navigationItem.title = kTitleOfSimpleBrowser;
 34     self.automaticallyAdjustsScrollViewInsets = NO; //是否自動適應滾動視圖的內嵌入；默認爲YES，這裏設置爲NO，避免網頁控件中_UIWebViewScrollView的UIWebBrowserView位置偏移
 35     
 36     CGRect rect = [[UIScreen mainScreen] bounds];
 37     static const CGFloat heightOfStatusBarAndNavigationBar = 64.0;
 38     CGFloat widthOfScreen = rect.size.width;
 39     CGFloat heightOfScreen  = rect.size.height;
 40     
 41     //添加搜索欄
 42     _searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0.0, heightOfStatusBarAndNavigationBar, widthOfScreen, 44.0)];
 43     _searchBar.delegate = self;
 44     _searchBar.placeholder = @"請輸入以file://或http開頭的地址";
 45     [self.view addSubview:_searchBar];
 46     
 47     //添加工具欄和左右按鈕（回退和前進）
 48     _toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0.0, heightOfScreen - 44.0,
 49                                                            widthOfScreen, 44.0)];
 50     rect = CGRectMake(0.0, 0.0, 32.0, 32.0);
 51     UIButton *btnBack = [UIButton buttonWithType:UIButtonTypeCustom];
 52     btnBack.frame = rect;
 53     [btnBack setImage:[UIImage imageNamed:@"LastPageNormal"] forState:UIControlStateNormal];
 54     [btnBack setImage:[UIImage imageNamed:@"LastPageDisabled"] forState:UIControlStateDisabled];
 55     [btnBack addTarget:self
 56                 action:@selector(webViewBack)
 57       forControlEvents:UIControlEventTouchUpInside];
 58     _barBtnBack = [[UIBarButtonItem alloc] initWithCustomView:btnBack];
 59     _barBtnBack.enabled = NO;
 60     
 61     UIBarButtonItem *barBtnSpacing=[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
 62     
 63     UIButton *btnForward = [UIButton buttonWithType:UIButtonTypeCustom];
 64     btnForward.frame = rect;
 65     [btnForward setImage:[UIImage imageNamed:@"NextPageNormal"] forState:UIControlStateNormal];
 66     [btnForward setImage:[UIImage imageNamed:@"NextPageDisabled"] forState:UIControlStateDisabled];
 67     [btnForward addTarget:self
 68                    action:@selector(webViewForward)
 69          forControlEvents:UIControlEventTouchUpInside];
 70     _barBtnForward = [[UIBarButtonItem alloc] initWithCustomView:btnForward];
 71     _barBtnForward.enabled = NO;
 72     
 73     _toolbar.items = @[ _barBtnBack, barBtnSpacing, _barBtnForward ];
 74     [self.view addSubview:_toolbar];
 75     
 76     //添加網頁控件
 77     CGFloat heightOfWebView = heightOfScreen - _searchBar.frame.origin.y - _searchBar.frame.size.height - _toolbar.frame.size.height;
 78     _webView = [[UIWebView alloc] initWithFrame:CGRectMake(0.0, heightOfStatusBarAndNavigationBar + _searchBar.frame.size.height,
 79                                                            widthOfScreen, heightOfWebView)];
 80     _webView.dataDetectorTypes = UIDataDetectorTypeAll;
 81     _webView.delegate = self;
 82     [self.view addSubview:_webView];
 83 }
 84 
 85 - (void)sendRequest:(NSString *)requestURLStr {
 86     if (requestURLStr.length > 0) {
 87         NSURL *requestURL;
 88         
 89         //加載bundle中的文件；網頁控件打開本地pdf、word文件依靠的並非他自身解析，而是依靠MIME Type識別文件類型並調用對應應用打開
 90         if ([requestURLStr hasPrefix:@"file://"]) {
 91             NSRange range = [requestURLStr rangeOfString:@"file://"];
 92             NSString *fileName = [requestURLStr substringFromIndex:range.length];
 93             requestURL = [[NSBundle mainBundle] URLForResource:fileName
 94                                                  withExtension:nil];
 95         } else {
 96             //加載百度搜索網站的內容
 97             if (![requestURLStr hasPrefix:@"http"]) {
 98                 requestURLStr = [NSString stringWithFormat:@"https://www.baidu.com/s?wd=%@", requestURLStr];
 99             }
100             //最終加載的仍是HTTP或者HTTPS協議的網站內容，進行編碼操做
101             requestURLStr = [requestURLStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
102             requestURL = [NSURL URLWithString:requestURLStr];
103         }
104         
105         //加載請求地址內容
106         [_webView loadRequest:[NSURLRequest requestWithURL:requestURL]];
107     }
108 }
109 
110 - (void)changeBarButtonStatus {
111     _barBtnBack.enabled = _webView.canGoBack;
112     _barBtnForward.enabled = _webView.canGoForward;
113 }
114 
115 #pragma mark - UIWebViewDelegate
116 - (void)webViewDidStartLoad:(UIWebView *)webView {
117     kApplication.networkActivityIndicatorVisible = YES;
118 }
119 
120 - (void)webViewDidFinishLoad:(UIWebView *)webView {
121     kApplication.networkActivityIndicatorVisible = NO;
122     [self changeBarButtonStatus];
123 }
124 
125 - (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {
126     NSLog(@"Error: %@", error);
127     kApplication.networkActivityIndicatorVisible = NO;
128     UIAlertView *alertVCustom = [[UIAlertView alloc] initWithTitle:@"提示信息"
129                                                            message:@"網絡鏈接錯誤"
130                                                           delegate:nil
131                                                  cancelButtonTitle:@"肯定"
132                                                  otherButtonTitles:nil, nil];
133     [alertVCustom show];
134 }
135 
136 #pragma mark - UISearchBarDelegate
137 - (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {
138     [self sendRequest:searchBar.text];
139     [_searchBar resignFirstResponder];
140 }
141 
142 @end 

PageInteractionViewController.h

1 #import <UIKit/UIKit.h>
2 
3 @interface PageInteractionViewController : UIViewController<UIWebViewDelegate>
4 @property (strong, nonatomic) UIWebView *webView;
5 
6 @end 

PageInteractionViewController.m

 1 #import "PageInteractionViewController.h"
 2 
 3 @interface PageInteractionViewController ()
 4 - (void)layoutUI;
 5 - (void)sendRequest;
 6 @end
 7 
 8 @implementation PageInteractionViewController
 9 
10 - (void)viewDidLoad {
11     [super viewDidLoad];
12     
13     [self layoutUI];
14     
15     [self sendRequest];
16 }
17 
18 - (void)didReceiveMemoryWarning {
19     [super didReceiveMemoryWarning];
20     // Dispose of any resources that can be recreated.
21 }
22 
23 - (void)layoutUI {
24     self.navigationItem.title = kTitleOfPageInteraction;
25     self.automaticallyAdjustsScrollViewInsets = NO; //是否自動適應滾動視圖的內嵌入；默認爲YES，這裏設置爲NO，避免網頁控件中_UIWebViewScrollView的UIWebBrowserView位置偏移
26     
27     CGRect rect = [[UIScreen mainScreen] bounds];
28     static const CGFloat heightOfStatusBarAndNavigationBar = 64.0;
29     //添加網頁控件
30     _webView = [[UIWebView alloc] initWithFrame:CGRectMake(0.0, heightOfStatusBarAndNavigationBar,
31                                                            rect.size.width, rect.size.height - heightOfStatusBarAndNavigationBar)];
32     _webView.dataDetectorTypes = UIDataDetectorTypeAll;
33     _webView.delegate = self;
34     self.automaticallyAdjustsScrollViewInsets = NO;
35     [self.view addSubview:_webView];
36 }
37 
38 - (void)sendRequest {
39     NSString *htmlStr=@"<html>\
40                             <head><title>KenmuHuang's Blog</title></head>\
41                             <body style=\"color:#0044AA;\">\
42                                 <h3 id=\"header\">I'm KenmuHuang</h3>\
43                                 <p>More coding, more thinking. Stay hungry, stay foolish.</p>\
44                                 <span>http://www.cnblogs.com/huangjianwu/</span>\
45                             </body>\
46                         </html>";
47     [_webView loadHTMLString:htmlStr baseURL:nil];
48 }
49 
50 #pragma mark - UIWebViewDelegate
51 - (void)webViewDidStartLoad:(UIWebView *)webView {
52     kApplication.networkActivityIndicatorVisible = YES;
53 }
54 
55 - (void)webViewDidFinishLoad:(UIWebView *)webView {
56     kApplication.networkActivityIndicatorVisible = NO;
57     NSLog(@"%@",[_webView stringByEvaluatingJavaScriptFromString:@"document.title"]); //打印內容爲html的title標籤內容：KenmuHuang's Blog
58     NSLog(@"%@",[_webView stringByEvaluatingJavaScriptFromString:@"document.getElementById('header').innerHTML='KenmuHuang\\'s Blog';"]); //必須使用雙反斜杆來轉譯單引號
59 }
60 
61 - (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {
62     NSLog(@"Error: %@", error);
63     kApplication.networkActivityIndicatorVisible = NO;
64     UIAlertView *alertVCustom = [[UIAlertView alloc] initWithTitle:@"提示信息"
65                                                            message:@"網絡鏈接錯誤"
66                                                           delegate:nil
67                                                  cancelButtonTitle:@"肯定"
68                                                  otherButtonTitles:nil, nil];
69     [alertVCustom show];
70 }
71 
72 @end 

RedirectURL.js

 1 function showSheet(title, cancelButtonTitle, destructiveButtonTitle, otherButtonTitle) {
 2     var url = 'KMActionSheet://?';
 3     var paramas = title + '&' + cancelButtonTitle + '&' + destructiveButtonTitle;
 4     if(otherButtonTitle) {
 5         paramas += '&' + otherButtonTitle;
 6     }
 7     window.location.href = url + encodeURIComponent(paramas);
 8 }
 9 
10 var header = document.getElementById('header');
11 if(header) {
12     header.onclick = function(){
13         showSheet('系統提示', '取消', '肯定', null);
14     };
15 } 

PageCallOCFunctionViewController.h

1 #import <UIKit/UIKit.h>
2 
3 @interface PageCallOCFunctionViewController : UIViewController<UIWebViewDelegate>
4 @property (strong, nonatomic) UIWebView *webView;
5 
6 @end 

PageCallOCFunctionViewController.m

  1 #import "PageCallOCFunctionViewController.h"
  2 
  3 @interface PageCallOCFunctionViewController ()
  4 - (void)layoutUI;
  5 - (void)sendRequest;
  6 - (void)showActionSheetWithTitle:(NSString *)title cancelButtonTitle:(NSString *)cancelButtonTitle destructiveButtonTitle:(NSString *)destructiveButtonTitle otherButtonTitle:(NSString *)otherButtonTitle;
  7 @end
  8 
  9 @implementation PageCallOCFunctionViewController
 10 
 11 - (void)viewDidLoad {
 12     [super viewDidLoad];
 13     
 14     [self layoutUI];
 15     
 16     [self sendRequest];
 17 }
 18 
 19 - (void)didReceiveMemoryWarning {
 20     [super didReceiveMemoryWarning];
 21     // Dispose of any resources that can be recreated.
 22 }
 23 
 24 - (void)layoutUI {
 25     self.navigationItem.title = kTitleOfPageCallOCFunction;
 26     self.automaticallyAdjustsScrollViewInsets = NO; //是否自動適應滾動視圖的內嵌入；默認爲YES，這裏設置爲NO，避免網頁控件中_UIWebViewScrollView的UIWebBrowserView位置偏移
 27     
 28     CGRect rect = [[UIScreen mainScreen] bounds];
 29     static const CGFloat heightOfStatusBarAndNavigationBar = 64.0;
 30     //添加網頁控件
 31     _webView = [[UIWebView alloc] initWithFrame:CGRectMake(0.0, heightOfStatusBarAndNavigationBar,
 32                                                            rect.size.width, rect.size.height - heightOfStatusBarAndNavigationBar)];
 33     _webView.dataDetectorTypes = UIDataDetectorTypeAll;
 34     _webView.delegate = self;
 35     self.automaticallyAdjustsScrollViewInsets = NO;
 36     [self.view addSubview:_webView];
 37 }
 38 
 39 - (void)sendRequest {
 40     NSString *htmlStr=@"<html>\
 41     <head><title>KenmuHuang's Blog</title></head>\
 42     <body style=\"color:#0044AA;\">\
 43     <h3 id=\"header\">I'm KenmuHuang, click me to show action sheet.</h3>\
 44     <p>More coding, more thinking. Stay hungry, stay foolish.</p>\
 45     <span>http://www.cnblogs.com/huangjianwu/</span>\
 46     </body>\
 47     </html>";
 48     [_webView loadHTMLString:htmlStr baseURL:nil];
 49 }
 50 
 51 - (void)showActionSheetWithTitle:(NSString *)title cancelButtonTitle:(NSString *)cancelButtonTitle destructiveButtonTitle:(NSString *)destructiveButtonTitle otherButtonTitle:(NSString *)otherButtonTitle{
 52     UIActionSheet *actionSheet=[[UIActionSheet alloc] initWithTitle:title
 53                                                            delegate:nil
 54                                                   cancelButtonTitle:cancelButtonTitle
 55                                              destructiveButtonTitle:destructiveButtonTitle
 56                                                   otherButtonTitles:otherButtonTitle, nil];
 57     [actionSheet showInView:self.view];
 58 }
 59 
 60 #pragma mark - UIWebViewDelegate
 61 - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
 62     BOOL isStartLoad = YES;
 63     if ([request.URL.scheme isEqualToString:@"kmactionsheet"]) { //request.URL.scheme 返回全小寫的內容
 64         NSString *paramContent = request.URL.query;
 65         NSArray *arrParam = [[paramContent stringByRemovingPercentEncoding] componentsSeparatedByString:@"&"];
 66         NSString *otherButtonTitle = nil;
 67         if (arrParam.count > 3) {
 68             otherButtonTitle = arrParam[3];
 69         }
 70         
 71         [self showActionSheetWithTitle:arrParam[0]
 72                      cancelButtonTitle:arrParam[1]
 73                 destructiveButtonTitle:arrParam[2]
 74                       otherButtonTitle:otherButtonTitle];
 75         isStartLoad = NO;
 76     }
 77     return isStartLoad;
 78 }
 79 
 80 - (void)webViewDidStartLoad:(UIWebView *)webView {
 81     kApplication.networkActivityIndicatorVisible = YES;
 82 }
 83 
 84 - (void)webViewDidFinishLoad:(UIWebView *)webView {
 85     kApplication.networkActivityIndicatorVisible = NO;
 86     
 87     //加載用於重定向地址的JavaScript內容
 88     NSString *jsPath = [[NSBundle mainBundle] pathForResource:@"RedirectURL.js" ofType:nil];
 89     NSString *jsContent = [NSString stringWithContentsOfFile:jsPath
 90                                                     encoding:NSUTF8StringEncoding
 91                                                        error:nil];
 92     [_webView stringByEvaluatingJavaScriptFromString:jsContent];
 93 }
 94 
 95 - (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {
 96     NSLog(@"Error: %@", error);
 97     kApplication.networkActivityIndicatorVisible = NO;
 98     UIAlertView *alertVCustom = [[UIAlertView alloc] initWithTitle:@"提示信息"
 99                                                            message:@"網絡鏈接錯誤"
100                                                           delegate:nil
101                                                  cancelButtonTitle:@"肯定"
102                                                  otherButtonTitles:nil, nil];
103     [alertVCustom show];
104 }
105 
106 @end 

AppDelegate.h

1 #import <UIKit/UIKit.h>
2 
3 @interface AppDelegate : UIResponder <UIApplicationDelegate>
4 
5 @property (strong, nonatomic) UIWindow *window;
6 @property (strong, nonatomic) UINavigationController *navigationController;
7 
8 @end 

AppDelegate.m

 1 #import "AppDelegate.h"
 2 #import "ViewController.h"
 3 
 4 @interface AppDelegate ()
 5 
 6 @end
 7 
 8 @implementation AppDelegate
 9 
10 
11 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
12     _window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
13     ViewController *viewController = [[ViewController alloc]
14                                       initWithSampleNameArray:@[ kTitleOfSimpleBrowser,
15                                                                  kTitleOfPageInteraction,
16                                                                  kTitleOfPageCallOCFunction ]];
17     _navigationController = [[UINavigationController alloc] initWithRootViewController:viewController];
18     _window.rootViewController = _navigationController;
19     //[_window addSubview:_navigationController.view]; //當_window.rootViewController關聯時，這一句無關緊要
20     [_window makeKeyAndVisible];
21     return YES;
22 }
23 
24 - (void)applicationWillResignActive:(UIApplication *)application {
25 }
26 
27 - (void)applicationDidEnterBackground:(UIApplication *)application {
28 }
29 
30 - (void)applicationWillEnterForeground:(UIApplication *)application {
31 }
32 
33 - (void)applicationDidBecomeActive:(UIApplication *)application {
34 }
35 
36 - (void)applicationWillTerminate:(UIApplication *)application {
37 }
38 
39 @end