UIWebView和網頁的互動(OC中調執行JS)

UIWebView和網頁的互動(OC中調執行JS)
UIWebView和網頁的互動(OC中調執行JS)
- (void)viewDidLoad
{
[superviewDidLoad];
// 1.webView
UIWebView *webView = [[UIWebViewalloc]init];
webView.frame= self.view.bounds;
webView.delegate= self;
// 伸縮頁面至填充整個webView
webView.scalesPageToFit= YES;
// 隱藏scrollView
webView.scrollView.hidden= YES;
[self.viewaddSubview:webView];

// 2.載入網頁
NSURLRequest *request = [NSURLRequestrequestWithURL:[NSURLURLWithString:@"http://m.dianping.com/tuan/deal/5501525"]];
[webView loadRequest:request];

// 3.建立
UIActivityIndicatorView *loadingView = [[UIActivityIndicatorViewalloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
[loadingView startAnimating];
loadingView.center= CGPointMake(160,240);
[self.viewaddSubview:loadingView];
self.loadingView= loadingView;
}
//在OC中調用JS
#pragma mark - UIWebViewDelegate
- (void)webViewDidFinishLoad:(UIWebView*)webView
{
NSMutableString *js1 = [NSMutableStringstring];
// 0.刪除頂部的導航條
[js1 appendString:@"var header = document.getElementsByTagName('header')[0];"];
[js1 appendString:@"header.parentNode.removeChild(header);"];

// 1.刪除底部的連結
[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.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.loadingViewremoveFromSuperview];
});
}
注意：從網路上擷取資料，如果不想看到某種效果，並且網頁存放在伺服器端，裡面的JS和Html代碼，沒有辦法修改，可以在UIWebView的代理方法執行JS代碼，去掉不想看到的效果。