Demo地址：http://download.csdn.net/detail/u012881779/8831835

获取网页上所有图片、获取所有html、获取网页title、获取网页内容文字。。。

.h 文件  代码:

  1. //网页  
  2. //NSString *strPath = [NSString stringWithFormat:@"http://www.baidu.com/s?wd=%@&cl=3",theWord];  
  4. //视频  
  5. //NSString *strPath = [NSString stringWithFormat:@"http://www.itinge.com/music/16241.mp4"];  
  7. //图片  
  8. NSString *strPath = [NSString stringWithFormat:@"http://image.baidu.com/search/index?tn=baiduimage&istype=2&ie=utf-8&word=%@",theWord];  
  10. strPath = [strPath stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

.m 文件  代码:

  1. @interface ViewController ()<UISearchBarDelegate , UIWebViewDelegate,UIGestureRecognizerDelegate>  
  2. @property (weak, nonatomic) IBOutlet UISearchBar *searchBar;  
  3. @property (weak, nonatomic) IBOutlet UIWebView *webview;  
  5. @end  
  7. @implementation ViewController  
  9. - (void)viewDidLoad {  
  10.     [super viewDidLoad];  
  12.     _searchBar.delegate = self;  
  13.     _webview.delegate = self;  
  14.     [self addTapOnWebView];  
  15. }  
  17. -(void)addTapOnWebView{  
  18.     UITapGestureRecognizer* singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];  
  19.     [_webview addGestureRecognizer:singleTap];  
  20.     singleTap.delegate = self;  
  21.     singleTap.cancelsTouchesInView = NO;  
  22. }  
  24. #pragma mark- TapGestureRecognizer  
  25. - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{  
  26.     return YES;  
  27. }  
  28. //被点击位置对应链接  
  29. -(void)handleSingleTap:(UITapGestureRecognizer *)sender{  
  30.     CGPoint pt = [sender locationInView:_webview];  
  31.     NSString *imgURL = [NSString stringWithFormat:@"document.elementFromPoint(%f, %f).src", pt.x, pt.y];  
  32.     NSString *urlToSave = [_webview stringByEvaluatingJavaScriptFromString:imgURL];  
  33.     NSLog(@"image url=%@", urlToSave);  
  35.     NSString * JsToGetHTMLSource = @"top.location.href";  
  36.     NSString * pageSource = [_webview   stringByEvaluatingJavaScriptFromString:JsToGetHTMLSource];  
  37.     NSLog(@"\n\n__url=%@", pageSource);  
  39.     if (urlToSave.length > 4) {  
  40.         NSString *substr = [urlToSave substringFromIndex:urlToSave.length-3];  
  41.         if([substr isEqualToString:@"jpg"] || [substr isEqualToString:@"png"]){  
  42.             [self showImageURL:urlToSave point:pt];  
  43.         }  
  44.     }  
  45. }  
  47. //呈现图片，HTML是否适配分辨率将影响点击资源与获取到得资源是否一致  
  48. -(void)showImageURL:(NSString *)url point:(CGPoint)point  
  49. {  
  50.     UIImageView *showView = [[UIImageView alloc] initWithFrame:[[UIScreen mainScreen]bounds]];  
  51.     showView.center = point;  
  52.     CGPoint newPoint = self.view.center;  
  53.     showView.center = newPoint;  
  55.     showView.backgroundColor = [UIColor blackColor];  
  56.     showView.alpha = 1;  
  57.     showView.userInteractionEnabled = YES;  
  58.     [self.view addSubview:showView];  
  59.     [showView setContentMode:UIViewContentModeScaleAspectFit];  
  60.     [showView showImageFromURL:url placeHolder:nil CompletionBlock:nil];  
  62.     UITapGestureRecognizer* singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleViewTap:)];  
  63.     [showView addGestureRecognizer:singleTap];  
  65.     [self.navigationController setNavigationBarHidden:YES animated:YES];  
  66. }  
  68. //移除图片查看视图  
  69. -(void)handleSingleViewTap:(UITapGestureRecognizer *)sender  
  70. {  
  71.     for (id obj in self.view.subviews) {  
  72.         if ([obj isKindOfClass:[UIImageView class]]) {  
  73.             [obj removeFromSuperview];  
  74.         }  
  75.     }  
  76.     [self.navigationController setNavigationBarHidden:YES animated:YES];  
  77. }  
  79. - (void)didReceiveMemoryWarning {  
  80.     [super didReceiveMemoryWarning];  
  81.     // Dispose of any resources that can be recreated.  
  82. }  
  84. /*
  85.  *JavaScript获取网页信息总结
  86.  获取所有html:NSString *lJs = @"document.documentElement.innerHTML";
  87.  获取网页title:NSString *lJs2 = @"document.title";
  88.  UIWebView *lWebView = [self getCurrentWebView];
  89.  NSString *lHtml1 = [lWebView stringByEvaluatingJavaScriptFromString:lJs];
  90.  NSString *lHtml2 = [lWebView stringByEvaluatingJavaScriptFromString:lJs2]; 
  92.  JavaScript获取网页信息总结
  93.  JavaScript获取当前页面URL、title等 
  95.  thisURL = document.URL;
  96.  thisHREF = document.location.href;
  97.  thisSLoc = self.location.href;
  98.  thisDLoc = document.location;
  99.  thisTLoc = top.location.href;
  100.  thisPLoc = parent.document.location;
  101.  thisTHost = top.location.hostname;
  102.  thisHost = location.hostname;
  103.  thisTitle = document.title;
  104.  thisProtocol = document.location.protocol;
  105.  thisPort = document.location.port;
  106.  thisHash = document.location.hash;
  107.  thisSearch = document.location.search;
  108.  thisPathname = document.location.pathname;
  109.  thisHtml = document.documentElement.innerHTML;
  110.  thisBodyText = document.documentElement.innerText;//获取网页内容文字
  111.  thisBodyText = document.body.innerText;//获取网页内容文字  怎么和上一个一样？有知道的请解释
  112.  */  
  113. //获取  
  114. - (IBAction)receiveAction:(id)sender {  
  115.     /*1视频*/  
  116.     /*
  117.      //获取网页中所有视频
  118.      NSString *getVideoTitle = [_webview getVideoTitle];
  119.      NSLog(@"\n\n 视频名称 : %@",getVideoTitle);
  120.      double getVideoDuration = [_webview getVideoDuration];
  121.      NSLog(@"\n\n 视频总时间 : %f",getVideoDuration);
  122.      double getVideoCurrentTime = [_webview getVideoCurrentTime];
  123.      NSLog(@"\n\n 视频当前时间 : %f",getVideoCurrentTime);
  124.      */  
  126.     /*2网页*/  
  127.     /*
  128.     //获取网页中所有图片
  129.     NSString *imageUrls = [_webview stringByEvaluatingJavaScriptFromString:@"var str=new Array();""$('img').each(function(){str.push($(this).attr('src'));});"
  130.                            "str.join(',');"];
  131.     NSLog(@"\n\n 所有图片 : %@",imageUrls); 
  133.     //获取所有html
  134.     NSString *lJs = @"document.documentElement.innerHTML";
  135.     NSString *lHtml1 = [_webview stringByEvaluatingJavaScriptFromString:lJs];
  136.     //NSLog(@"1.%@",lHtml1); 
  138.     //获取网页title:
  139.     NSString *lJs2 = @"document.title";
  140.     NSString *lHtml2 = [_webview stringByEvaluatingJavaScriptFromString:lJs2];
  141.     NSLog(@"2.%@",lHtml2); 
  143.     //thisURL = document.URL
  144.     NSString *lJs3 = @"document.URL";
  145.     NSString *lHtml3 = [_webview stringByEvaluatingJavaScriptFromString:lJs3];
  146.     NSLog(@"3.%@",lHtml3); 
  148.     //获取网页内容文字
  149.     NSString *lJs4 = @"document.documentElement.innerText";
  150.     NSString *lHtml4 = [_webview stringByEvaluatingJavaScriptFromString:lJs4];
  151.     NSLog(@"4.%@",lHtml4); 
  153.     //获取网页内容文字
  154.     NSString *lJs5 = @"document.body.innerText";
  155.     NSString *lHtml5 = [_webview stringByEvaluatingJavaScriptFromString:lJs5];
  156.     NSLog(@"5.%@",lHtml5);
  157.     */  
  159.     /*3图片*/  
  160.     /**/  
  161.     //获取所有html  
  162.     NSString *innerHTML = @"document.documentElement.innerHTML";  
  163.     NSString *innerHTMLString = [_webview stringByEvaluatingJavaScriptFromString:innerHTML];  
  164.     //检索图片  
  165.     if(![innerHTMLString isEqualToString:@"<head></head><body></body>"]){  
  166.         [self searchPictureFromHTML:innerHTMLString];  
  167.     }else{  
  168.         UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"请先搜索关键字" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil nil];  
  169.         [alert show];  
  170.     }  
  172. }  
  174. //检索图片  
  175. -(void)searchPictureFromHTML:(NSString *)theHTML{  
  176.     //"http://img0.bdstatic.com/img/image/shouye/qwscmeb02.jpg”  
  177.     NSMutableArray *picMutableArr = [[NSMutableArray alloc] init];  
  178.     NSMutableArray *picHttpArr = [[theHTML componentsSeparatedByString:@"http://"] mutableCopy];  
  180.     for (int i = 0; i < picHttpArr.count ; i ++) {  
  181.         NSString *tempStr  = [picHttpArr objectAtIndex:i];  
  182.         NSArray  *tempArr  = [tempStr componentsSeparatedByString:@".jpg"];  
  183.         NSString *firstStr = [tempArr firstObject];  
  184.         //判断字符串是否为图片  
  185.         if([self judgeStringIsPicture:firstStr]){  
  186.             if([self judgeStringIsNull:firstStr]){  
  187.                 NSString *picUrl = [NSString stringWithFormat:@"http://%@.jpg",firstStr];  
  188.                 [picMutableArr addObject:picUrl];  
  189.             }  
  190.         }else{  
  191.         }  
  192.     }  
  193.     //清除重复图片  
  194.     picMutableArr = [self cleanRepeatPicture:picMutableArr];  
  196.     //展示获取图片  
  197.     PictureViewController *picVc = [[PictureViewController alloc] initWithNibName:@"PictureViewController" bundle:nil];  
  198.     picVc.valueArr = picMutableArr;  
  199.     [self.navigationController pushViewController:picVc animated:YES];  
  201. }  
  203. //判断字符串是否为图片链接  
  204. -(BOOL)judgeStringIsPicture:(NSString *)string{  
  205.     BOOL result = YES;  
  206.     NSMutableArray *mutable = [[NSMutableArray alloc] initWithObjects:@"<",@">",@"{",@"}",@"[",@"]",@"(",@")",@"|",@"||",@"$",@"?",@";", nil nil];  
  208.     if(string != nil && string.length > 0){  
  209.         for (int i = 0; i < string.length; i ++) {  
  210.             NSString *subStr = [string substringWithRange:NSMakeRange(i, 1)];  
  211.             for (int j = 0; j < mutable.count ; j ++) {  
  212.                 NSString *markStr = [mutable objectAtIndex:j];  
  213.                 if([subStr isEqualToString:markStr]){  
  214.                     result = NO;  
  215.                 }  
  216.             }  
  217.         }  
  218.     }  
  220.     return result;  
  221. }  
  223. //清除重复图片  
  224. -(NSMutableArray *)cleanRepeatPicture:(NSMutableArray *)picarr{  
  225.     NSMutableArray *tempArr = [[NSMutableArray alloc] init];  
  227.     for (int i = picarr.count-1 ; i >= 0 ; i --) {  
  228.         NSString *tempStr = [picarr objectAtIndex:i];  
  229.         NSArray *oneArr = [tempStr componentsSeparatedByString:@"&fm"];  
  230.         if(tempArr.count == 0){  
  231.             [tempArr insertObject:tempStr atIndex:0];  
  232.         }else{  
  233.             BOOL result = YES;  
  234.             for (int j = 0 ; j < tempArr.count ; j ++) {  
  235.                 NSString *jstr = [tempArr objectAtIndex:j];  
  236.                 if([jstr isEqualToString:tempStr]){  
  237.                     result = NO;  
  238.                 }else{  
  239.                     if(oneArr.count > 1){  
  240.                         NSArray *twoArr = [jstr componentsSeparatedByString:@"&fm"];  
  241.                         if([[oneArr firstObject] isEqualToString:[twoArr firstObject]]){  
  242.                             result = NO;  
  243.                         }  
  244.                     }  
  245.                 }  
  246.             }  
  247.             if(result){  
  248.                 [tempArr insertObject:tempStr atIndex:0];  
  249.             }  
  250.         }  
  251.     }  
  253.     return tempArr;  
  254. }  
  256. //HTML  
  257. -(void)detailsWithUrl:(NSString *)urlStr{  
  258.     NSURL *url =[NSURL URLWithString:urlStr];  
  259.     NSURLRequest *request =[NSURLRequest requestWithURL:url];  
  260.     [_webview loadRequest:request];  
  261.     [_webview setScalesPageToFit:YES];  
  263.     //隐藏滚动条  
  264.     _webview.backgroundColor=[UIColor clearColor];  
  265.     _webview.opaque = NO;  
  266.     for (UIView *aView in [_webview subviews]){  
  267.         [aView setBackgroundColor:[UIColor clearColor]];  
  268.         if ([aView isKindOfClass:[UIScrollView class]]){  
  269.             UIScrollView *tempSV = (UIScrollView *)aView;  
  270.             tempSV.tag = 1321;  
  271.             [tempSV setShowsHorizontalScrollIndicator:NO]; //右侧的滚动条 （水平的类似）  
  272.             [tempSV setShowsVerticalScrollIndicator:NO];  
  273.             [tempSV setBounces:NO];  
  274.             [tempSV setContentSize:CGSizeMake(1,tempSV.contentSize.height )];  
  275.             for (UIView *shadowView in tempSV.subviews){  
  276.                 if ([shadowView isKindOfClass:[UIImageView class]]){  
  277.                     shadowView.hidden = YES;  //上下滚动出边界时的黑色的图片 也就是拖拽后的上下阴影  
  278.                 }  
  279.             }  
  280.         }  
  281.     }  
  282. }  
  284. //判断字符串不全为空  
  285. -(BOOL)judgeStringIsNull:(NSString *)string{  
  286.     BOOL result = NO;  
  287.     if(string != nil && string.length > 0){  
  288.         for (int i = 0; i < string.length; i ++) {  
  289.             NSString *subStr = [string substringWithRange:NSMakeRange(i, 1)];  
  290.             if(![subStr isEqualToString:@" "] && ![subStr isEqualToString:@""]){  
  291.                 result = YES;  
  292.             }  
  293.         }  
  294.     }  
  295.     return result;  
  296. }  
  298. #pragma mark UISearchBarDelegate  
  299. - (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar{  
  300.     if([self judgeStringIsNull:searchBar.text]){  
  301.         //搜索接口  
  302.         NSString *urlStr = [NetPortShared baiduSearchDelegate:self andTag:33333 andWord:_searchBar.text];  
  303.         [self detailsWithUrl:urlStr];  
  304.     }else{  
  305.         UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"请输入关键字" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil nil];  
  306.         [alert show];  
  307.     }  
  308. }  
  310. @end

示意图：

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文/作者:枫志应明

c博客地址:http://blog.csdn.net/wsyx768/article/details/46618125

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