UIWebView和网页的交互(OC中调执行JS)
- (void)viewDidLoad
{
[super
viewDidLoad];
// 1.webView
UIWebView *webView = [[UIWebView
alloc]
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.view
addSubview:webView];
// 2.加载网页
NSURLRequest *request = [NSURLRequest
requestWithURL:[NSURL
URLWithString:@"http://m.dianping.com/tuan/deal/5501525"]];
[webView
loadRequest:request];
// 3.创建
UIActivityIndicatorView
*loadingView = [[UIActivityIndicatorView
alloc]
initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
[loadingView
startAnimating];
loadingView.center
=
CGPointMake(160,
240);
[self.view
addSubview:loadingView];
self.loadingView
= loadingView;
}
//
在OC中调用JS
#pragma mark - UIWebViewDelegate
- (void)webViewDidFinishLoad:(UIWebView
*)webView
{
NSMutableString
*js1 = [NSMutableString
string];
// 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 = [NSMutableString
string];
// 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.loadingView
removeFromSuperview];
});
}
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)
原文：http://blog.csdn.net/itcontend/article/details/41706967
