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UIWebView和网页的交互(OC中调执行JS)

UIWebView和网页的交互(OC中调执行JS)
- (void)viewDidLoad
{
    [
superviewDidLoad];
   
// 1.webView
   
UIWebView *webView = [[UIWebViewalloc]init];
    webView.
frame= self.view.bounds;
    webView.
delegate= self;
   
// 伸缩页面至填充整个webView
    webView.
scalesPageToFit= YES;
   
// 隐藏scrollView
    webView.
scrollView.hidden= YES;
    [
self.viewaddSubview:webView];
   
   
// 2.加载网页
   
NSURLRequest *request = [NSURLRequestrequestWithURL:[NSURLURLWithString:@"http://m.dianping.com/tuan/deal/5501525"]];
    [webView
loadRequest:request];
   
   
// 3.创建
   
UIActivityIndicatorView *loadingView = [[UIActivityIndicatorViewalloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
    [loadingView
startAnimating];
    loadingView.
center= CGPointMake(160,240);
    [
self.viewaddSubview:loadingView];
   
self.loadingView= loadingView;
}

//OC中调用JS
#pragma mark - UIWebViewDelegate
- (void)webViewDidFinishLoad:(UIWebView*)webView
{

   
NSMutableString *js1 = [NSMutableStringstring];
   
// 0.删除顶部的导航条
    [js1
appendString:@"var header = document.getElementsByTagName(‘header‘)[0];"];
    [js1
appendString:@"header.parentNode.removeChild(header);"];
   
   
// 1.删除底部的链接
    [js1
appendString:@"var footer = document.getElementsByTagName(‘footer‘)[0];"];
    [js1
appendString:@"footer.parentNode.removeChild(footer);"];
    [webView
stringByEvaluatingJavaScriptFromString:js1];
   
   
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.25* NSEC_PER_SEC)),dispatch_get_main_queue(), ^{
       
NSMutableString *js2 = [NSMutableStringstring];
       
// 2.删除浮动的广告
        [js2
appendString:@"var list = document.body.childNodes;"];
        [js2
appendString:@"var len = list.length;"];
        [js2
appendString:@"var banner = list[len - 1];"];
        [js2
appendString:@"banner.parentNode.removeChild(banner);"];
        [webView
stringByEvaluatingJavaScriptFromString:js2];
       
       
// 显示scrollView
        webView.
scrollView.hidden= NO;
       
       
// 删除圈圈
        [
self.loadingViewremoveFromSuperview];
    });
}
注意:
从网络上获取数据,如果不想看到某种效果,并且网页存放在服务器端,里面的JS和Html代码,没有办法修改,可以在UIWebView的代理方法执行JS代码,去掉不想看到的效果。

UIWebView和网页的交互(OC中调执行JS)