UIWebView和網(wǎng)頁的交互(OC中調(diào)執(zhí)行JS)
來源：程序員人生 發(fā)布時間：2014-12-06 16:48:29 閱讀次數(shù)：2604次
UIWebView和網(wǎng)頁的交互(OC中調(diào)履行JS)
- (void)viewDidLoad
{
[super
viewDidLoad];
// 1.webView
UIWebView *webView = [[UIWebView
alloc]
init];
webView.frame
=
self.view.bounds;
webView.delegate
=
self;
//
伸縮頁面至填充全部webView
webView.scalesPageToFit
=
YES;
//
隱藏scrollView
webView.scrollView.hidden
=
YES;
[self.view
addSubview:webView];
// 2.加載網(wǎng)頁
NSURLRequest *request = [NSURLRequest
requestWithURL:[NSURL
URLWithString:@"http://m.dianping.com/tuan/deal/5501525"]];
[webView
loadRequest:request];
// 3.創(chuàng)建
UIActivityIndicatorView
*loadingView = [[UIActivityIndicatorView
alloc]
initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
[loadingView
startAnimating];
loadingView.center
=
CGPointMake(160,
240);
[self.view
addSubview:loadingView];
self.loadingView
= loadingView;
}
//
在OC中調(diào)用JS
#pragma mark - UIWebViewDelegate
- (void)webViewDidFinishLoad:(UIWebView
*)webView
{
NSMutableString
*js1 = [NSMutableString
string];
// 0.刪除頂部的導(dǎo)航條
[js1
appendString:@"var header = document.getElementsByTagName('header')[0];"];
[js1
appendString:@"header.parentNode.removeChild(header);"];
// 1.刪除底部的鏈接
[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.刪除浮動的廣告
[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];
//
顯示scrollView
webView.scrollView.hidden
=
NO;
//
刪除圈圈
[self.loadingView
removeFromSuperview];
});
}
注意：
從網(wǎng)絡(luò)上獲得數(shù)據(jù)，如果不想看到某種效果，并且網(wǎng)頁寄存在服務(wù)器端，里面的JS和Html代碼，沒有辦法修改，可以在UIWebView的代理方法履行JS代碼，去掉不想看到的效果。
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