网页去广告-尊龙凯时

// 方法一：
 - (void)shownews:(nsdictionary *)news
 {
 // 1.取出网页内容
 nsstring *body = news[@"body"];
 // 2.取出图片
 nsdictionary *img = [news[@"img"] lastobject];
 nsstring *imghtml = [nsstring stringwithformat:@"", img[@"src"]];
 // 2.创建一个webview，显示网页
 uiwebview *webview = [[uiwebview alloc] init];
 webview.frame = self.view.bounds;
 [self.view addsubview:webview];
 // 3.拼接网页内容
 nsstring *html = [body stringbyreplacingoccurrencesofstring:img[@"ref"] withstring:imghtml];
 // 4.取出新闻标题
 nsstring *title = news[@"title"];
 // 5.取出新闻的时间
 nsstring *time = news[@"ptime"];
 // 头部内容
 nsstring *header = [nsstring stringwithformat:@"
%@
%@
", title, time];
 html = [nsstring stringwithformat:@"%@%@", header, html];
 // 链接mainbundle中的css文件
 nsurl *cssurl = [[nsbundle mainbundle] urlforresource:@"news" withextension:@"css"];
 html = [nsstring stringwithformat:@"%@", html, cssurl];
 // 5.加载网页内容
 [webview loadhtmlstring:html baseurl:nil];
 }
// 方法二：火狐浏览器：在要去掉的广告上，右键”查看元素“，将代码粘贴到要替换的字符串处
 nsstring *url = @"http://ibaby.ipadown.com/api/food/food.show.detail.php?id=";
    nsstring *website = [url stringbyappendingstring:self.idtext];
    nsurl *siteurl= [nsurl urlwithstring:website];
    nsurlrequest *request = [nsurlrequest requestwithurl:siteurl];
    // 加载请求
//    [self.webview.web loadrequest:request];
    dispatch_async(dispatch_get_global_queue(0, 0), ^{
        nsurlsessiondatatask *datatask = [[nsurlsession sharedsession]datataskwithrequest:request completionhandler:^(nsdata * _nullable data, nsurlresponse * _nullable response, nserror * _nullable error) {
            self.htmlaboslutestring = [[nsstring alloc]initwithdata:data encoding:nsutf8stringencoding];
            self.htmlaboslutestring = [self.htmlaboslutestring stringbyreplacingoccurrencesofstring:@"" withstring:@""];
// 这是要去掉广告的第二个地方
self.htmlaboslutestring = [self.htmlaboslutestring stringbyreplacingoccurrencesofstring:str9 withstring:@""];
            dispatch_async(dispatch_get_main_queue(), ^{
                [self.webview.web loadhtmlstring:self.htmlaboslutestring baseurl:nil];
            });
        }];
        [datatask resume];
        cgrect tmpframe = self.webview.web.frame;
        cgfloat h = self.navigationcontroller.navigationbar.frame.size.height   20;
        tmpframe.origin.y -= h;
        self.webview.web.frame = tmpframe;
    });
// 方法三：
 nsstring *str = @".jpg\" height=\"200\" width=\"340\"/>";
- (nsstring *)transformmessage:(nsstring *)message withstring:(nsstring *)string
{
    nsstring *messagecopy = message;
    nsscanner *thescanner;
    nsstring *text = nil;
    thescanner = [nsscanner scannerwithstring:messagecopy];
    while ([thescanner isatend] == no)
    {
         // find start of tag
        [thescanner scanuptostring:@".jpg" intostring:null] ;
         // find end of tag
        if ([thescanner scanuptostring:@">" intostring:&text] || [thescanner scanuptostring:@"/>" intostring:&text]) {
            // .jpg" height="200" width="340"/>
            // 如果不需要第二个参数 ：
            // 可以将string替换为 [nsstring stringwithformat:@".jpg\" height=\\\"200\" width=\"340\"/>"]
            if (text != nil) {
                messagecopy = [messagecopy stringbyreplacingoccurrencesofstring:[nsstring stringwithformat:@"%@>", text] withstring:string];
                nslog(@"%@",messagecopy);
                break;
            }
        }
    }
    return messagecopy;
}
作用是把start tag和end tag 之间替换成string的值