项目需要通过提取网页的内容。
实现思路：UIWebView的请求拦截——js的动态注入——内容的获取——内容的返回
需要的知识：
ios下js与原生互相调用 【iOS】网页中调用JS与JS注
- (void)webViewDidFinishLoad:(UIWebView *)webView {
[webView stringByEvaluatingJavaScriptFromString:@"var script = document.createElement('script');"
"script.type = 'text/javascript';"
"script.text = \"var contents = '';"
"function extractDocument(el) {"
"var childNodes = el.childNodes;"
"for (var i = 0; i < childNodes.length; i ++) {"
"var c = childNodes[i];"
"switch(c.nodeType) {"
"case 1:"
"if(c.nodeName=='A');"
"extractDocument(c);"
"break;"
"case 3:"
"contents += '|' + c.nodeValue;"
"break; "
"} "
"}"
"}"
"function String(el) {"
"extractDocument(document.body);"
"return contents;"
"}\";"
"document.getElementsByTagName('head')[0].appendChild(script);"]; //添加到head标签中
NSString *s = [webView stringByEvaluatingJavaScriptFromString:@"String(document.body);"];
NSString *s1 = [s stringByReplacingOccurrencesOfString:@" " withString:@""];
NSString *s2 = [s1 stringByReplacingOccurrencesOfString:@"\n" withString:@""];
NSLog(@"==========%@",s2);
NSArray *array = [s2 componentsSeparatedByString:@"|"];
NSString *tagStrig1 = @"商品名称";
NSString *tagStrig2 = @"产品名称";
NSString *str = [[NSString alloc]init];
for (int index = 0; index < array.count;index++) {
str = array[index];
if (([str rangeOfString:tagStrig1].location != NSNotFound) ||
([str rangeOfString:tagStrig2].location != NSNotFound) ){
if (str.length > @"【商品名称】： ".length ) {
str = array[index];
// NSLog(@"====%@",array[index]);
break;
}else {
str = array[index + 1];
// NSLog(@"=====%@",array[index + 1]);
break;
}
}
}
if (str.length == 0) {
NSLog(@"=====对不起！不能识别");
}else {
NSLog(@"=========%@",str);
HomeProductViewController *ProductViewController = [[HomeProductViewController alloc]init];
ProductViewController.string = [@"•" stringByAppendingString:str];
[self.navigationController pushViewController:ProductViewController animated:YES];
}
}
