iOS获取网页上数据（图片、文字、视频）

//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];

@interface ViewController ()<UISearchBarDelegate , UIWebViewDelegate,UIGestureRecognizerDelegate>
@property (weak, nonatomic) IBOutlet UISearchBar *searchBar;
@property (weak, nonatomic) IBOutlet UIWebView *webview;

@end

@implementatio
4000
n 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 = document.location.href;
thisSLoc = self.location.href;
thisDLoc = document.location;
thisTLoc = top.location.href;
thisPLoc = parent.document.location;
thisTHost = top.location.hostname;
thisHost = location.hostname;
thisTitle = document.title;
thisProtocol = document.location.protocol;
thisPort = document.location.port;
thisHash = document.location.hash;
thisSearch = document.location.search;
thisPathname = document.location.pathname;
thisHtml = document.documentElement.innerHTML;
thisBodyText = document.documentElement.innerText;//获取网页内容文字
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
*/
//获取
- (IBAction)receiveAction:(id)sender {
/*1视频*/
/*
//获取网页中所有视频
NSString *getVideoTitle = [_webview getVideoTitle];
NSLog(@"\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;

e0ad
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