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:

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

.m 文件  代码:

@interface ViewController ()<UISearchBarDelegate , UIWebViewDelegate,UIGestureRecognizerDelegate>  @property (weak, nonatomic) IBOutlet UISearchBar *searchBar;  @property (weak, nonatomic) IBOutlet UIWebView *webview;  @end  @implementation ViewController  - (void)viewDidLoad {      [super viewDidLoad];      _searchBar.delegate = self;      _webview.delegate = self;      [self addTapOnWebView];  }  -(void)addTapOnWebView{      UITapGestureRecognizer* singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];      [_webview addGestureRecognizer:singleTap];      singleTap.delegate = self;      singleTap.cancelsTouchesInView = NO;  }  #pragma mark- TapGestureRecognizer  - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{      return YES;  }  //被点击位置对应链接  -(void)handleSingleTap:(UITapGestureRecognizer *)sender{      CGPoint pt = [sender locationInView:_webview];      NSString *imgURL = [NSString stringWithFormat:@"document.elementFromPoint(%f, %f).src", pt.x, pt.y];      NSString *urlToSave = [_webview stringByEvaluatingJavaScriptFromString:imgURL];      NSLog(@"image url=%@", urlToSave);      NSString * JsToGetHTMLSource = @"top.location.href";      NSString * pageSource = [_webview   stringByEvaluatingJavaScriptFromString:JsToGetHTMLSource];      NSLog(@"\n\n__url=%@", pageSource);      if (urlToSave.length > 4) {          NSString *substr = [urlToSave substringFromIndex:urlToSave.length-3];          if([substr isEqualToString:@"jpg"] || [substr isEqualToString:@"png"]){              [self showImageURL:urlToSave point:pt];          }      }  }  //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  -(void)showImageURL:(NSString *)url point:(CGPoint)point  {      UIImageView *showView = [[UIImageView alloc] initWithFrame:[[UIScreen mainScreen]bounds]];      showView.center = point;      CGPoint newPoint = self.view.center;      showView.center = newPoint;      showView.backgroundColor = [UIColor blackColor];      showView.alpha = 1;      showView.userInteractionEnabled = YES;      [self.view addSubview:showView];      [showView setContentMode:UIViewContentModeScaleAspectFit];      [showView showImageFromURL:url placeHolder:nil CompletionBlock:nil];      UITapGestureRecognizer* singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleViewTap:)];      [showView addGestureRecognizer:singleTap];      [self.navigationController setNavigationBarHidden:YES animated:YES];  }  //移除图片查看视图  -(void)handleSingleViewTap:(UITapGestureRecognizer *)sender  {      for (id obj in self.view.subviews) {          if ([obj isKindOfClass:[UIImageView class]]) {              [obj removeFromSuperview];          }      }      [self.navigationController setNavigationBarHidden:YES animated:YES];  }  - (void)didReceiveMemoryWarning {      [super didReceiveMemoryWarning];      // Dispose of any resources that can be recreated.  }  /*  *JavaScript获取网页信息总结  获取所有html:NSString *lJs = @"document.documentElement.innerHTML";  获取网页title:NSString *lJs2 = @"document.title";  UIWebView *lWebView = [self getCurrentWebView];  NSString *lHtml1 = [lWebView stringByEvaluatingJavaScriptFromString:lJs];  NSString *lHtml2 = [lWebView stringByEvaluatingJavaScriptFromString:lJs2];  JavaScript获取网页信息总结  JavaScript获取当前页面URL、title等  thisURL = document.URL;  thisHREF = http://www.mamicode.com/document.location.href; "\n\n 视频名称 : %@",getVideoTitle);      double getVideoDuration = [_webview getVideoDuration];      NSLog(@"\n\n 视频总时间 : %f",getVideoDuration);      double getVideoCurrentTime = [_webview getVideoCurrentTime];      NSLog(@"\n\n 视频当前时间 : %f",getVideoCurrentTime);      */      /*2网页*/      /*     //获取网页中所有图片     NSString *imageUrls = [_webview stringByEvaluatingJavaScriptFromString:@"var str=new Array();""$(‘img‘).each(function(){str.push($(this).attr(‘src‘));});"                            "str.join(‘,‘);"];     NSLog(@"\n\n 所有图片 : %@",imageUrls);     //获取所有html     NSString *lJs = @"document.documentElement.innerHTML";     NSString *lHtml1 = [_webview stringByEvaluatingJavaScriptFromString:lJs];     //NSLog(@"1.%@",lHtml1);     //获取网页title:     NSString *lJs2 = @"document.title";     NSString *lHtml2 = [_webview stringByEvaluatingJavaScriptFromString:lJs2];     NSLog(@"2.%@",lHtml2);     //thisURL = document.URL     NSString *lJs3 = @"document.URL";     NSString *lHtml3 = [_webview stringByEvaluatingJavaScriptFromString:lJs3];     NSLog(@"3.%@",lHtml3);     //获取网页内容文字     NSString *lJs4 = @"document.documentElement.innerText";     NSString *lHtml4 = [_webview stringByEvaluatingJavaScriptFromString:lJs4];     NSLog(@"4.%@",lHtml4);     //获取网页内容文字     NSString *lJs5 = @"document.body.innerText";     NSString *lHtml5 = [_webview stringByEvaluatingJavaScriptFromString:lJs5];     NSLog(@"5.%@",lHtml5);     */      /*3图片*/      /**/      //获取所有html      NSString *innerHTML = @"document.documentElement.innerHTML";      NSString *innerHTMLString = [_webview stringByEvaluatingJavaScriptFromString:innerHTML];      //检索图片      if(![innerHTMLString isEqualToString:@"<head></head><body></body>"]){          [self searchPictureFromHTML:innerHTMLString];      }else{          UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"请先搜索关键字" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil nil];          [alert show];      }  }  //检索图片  -(void)searchPictureFromHTML:(NSString *)theHTML{      //"http://img0.bdstatic.com/img/image/shouye/qwscmeb02.jpg”      NSMutableArray *picMutableArr = [[NSMutableArray alloc] init];      NSMutableArray *picHttpArr = [[theHTML componentsSeparatedByString:@"http://"] mutableCopy];      for (int i = 0; i < picHttpArr.count ; i ++) {          NSString *tempStr  = [picHttpArr objectAtIndex:i];          NSArray  *tempArr  = [tempStr componentsSeparatedByString:@".jpg"];          NSString *firstStr = [tempArr firstObject];          //判断字符串是否为图片          if([self judgeStringIsPicture:firstStr]){              if([self judgeStringIsNull:firstStr]){                  NSString *picUrl = [NSString stringWithFormat:@"http://%@.jpg",firstStr];                  [picMutableArr addObject:picUrl];              }          }else{          }      }      //清除重复图片      picMutableArr = [self cleanRepeatPicture:picMutableArr];      //展示获取图片      PictureViewController *picVc = [[PictureViewController alloc] initWithNibName:@"PictureViewController" bundle:nil];      picVc.valueArr = picMutableArr;      [self.navigationController pushViewController:picVc animated:YES];  }  //判断字符串是否为图片链接  -(BOOL)judgeStringIsPicture:(NSString *)string{      BOOL result = YES;      NSMutableArray *mutable = [[NSMutableArray alloc] initWithObjects:@"<",@">",@"{",@"}",@"[",@"]",@"(",@")",@"|",@"||",@"$",@"?",@";", nil nil];      if(string != nil && string.length > 0){          for (int i = 0; i < string.length; i ++) {              NSString *subStr = [string substringWithRange:NSMakeRange(i, 1)];              for (int j = 0; j < mutable.count ; j ++) {                  NSString *markStr = [mutable objectAtIndex:j];                  if([subStr isEqualToString:markStr]){                      result = NO;                  }              }          }      }      return result;  }  //清除重复图片  -(NSMutableArray *)cleanRepeatPicture:(NSMutableArray *)picarr{      NSMutableArray *tempArr = [[NSMutableArray alloc] init];      for (int i = picarr.count-1 ; i >= 0 ; i --) {          NSString *tempStr = [picarr objectAtIndex:i];          NSArray *oneArr = [tempStr componentsSeparatedByString:@"&fm"];          if(tempArr.count == 0){              [tempArr insertObject:tempStr atIndex:0];          }else{              BOOL result = YES;              for (int j = 0 ; j < tempArr.count ; j ++) {                  NSString *jstr = [tempArr objectAtIndex:j];                  if([jstr isEqualToString:tempStr]){                      result = NO;                  }else{                      if(oneArr.count > 1){                          NSArray *twoArr = [jstr componentsSeparatedByString:@"&fm"];                          if([[oneArr firstObject] isEqualToString:[twoArr firstObject]]){                              result = NO;                          }                      }                  }              }              if(result){                  [tempArr insertObject:tempStr atIndex:0];              }          }      }      return tempArr;  }  //HTML  -(void)detailsWithUrl:(NSString *)urlStr{      NSURL *url =[NSURL URLWithString:urlStr];      NSURLRequest *request =[NSURLRequest requestWithURL:url];      [_webview loadRequest:request];      [_webview setScalesPageToFit:YES];      //隐藏滚动条      _webview.backgroundColor=[UIColor clearColor];      _webview.opaque = NO;      for (UIView *aView in [_webview subviews]){          [aView setBackgroundColor:[UIColor clearColor]];          if ([aView isKindOfClass:[UIScrollView class]]){              UIScrollView *tempSV = (UIScrollView *)aView;              tempSV.tag = 1321;              [tempSV setShowsHorizontalScrollIndicator:NO]; //右侧的滚动条 （水平的类似）              [tempSV setShowsVerticalScrollIndicator:NO];              [tempSV setBounces:NO];              [tempSV setContentSize:CGSizeMake(1,tempSV.contentSize.height )];              for (UIView *shadowView in tempSV.subviews){                  if ([shadowView isKindOfClass:[UIImageView class]]){                      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                  }              }          }      }  }  //判断字符串不全为空  -(BOOL)judgeStringIsNull:(NSString *)string{      BOOL result = NO;      if(string != nil && string.length > 0){          for (int i = 0; i < string.length; i ++) {              NSString *subStr = [string substringWithRange:NSMakeRange(i, 1)];              if(![subStr isEqualToString:@" "] && ![subStr isEqualToString:@""]){                  result = YES;              }          }      }      return result;  }  #pragma mark UISearchBarDelegate  - (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar{      if([self judgeStringIsNull:searchBar.text]){          //搜索接口          NSString *urlStr = [NetPortShared baiduSearchDelegate:self andTag:33333 andWord:_searchBar.text];          [self detailsWithUrl:urlStr];      }else{          UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"请输入关键字" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil nil];          [alert show];      }  }  @end

示意图：

文/作者:枫志应明

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

获取网页上数据（图片、文字、视频）－b