UIWebView和网页的交互(OC中调执行JS)

来源：互联网发布：幻灯片软件编辑：程序博客网时间：2024/05/01 19:56

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;
}
//在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。

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