iOS webView与JS的交互（干货）
2017-05-10 本文已影响4957人
酒深巷子Ya
一、webView加载html代码
webVidew的方法
- (nullable NSString *)stringByEvaluatingJavaScriptFromString:(NSString *)script;
二、对webView内的链接进行限制
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
NSString *url = request.URL.absoluteString;
if ([url rangeOfString:@
"[hiya://](hiya://)"
].location != NSNotFound) {
// url的协议头是hiya
NSLog(@
"hd1009"
);
return
NO;
}
return YES;
}
捕获JS里面的方法(倒入JavaScriptCored框架)
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
JSContext *context = [webView valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"];
//定义好JS要调用的方法，finish就是调用的方法名
context[@"finish"] = ^() {
dispatch_async(dispatch_get_main_queue(), ^{
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"方式二" message:@"这是OC原生的弹出窗" delegate:self cancelButtonTitle:@"收到" otherButtonTitles:nil];
[alertView show];
});
};
}
三、获取页面内的任意标签属性的值
- (void)webViewDidFinishLoad:(UIWebView *)webView{
NSString *title = [webView stringByEvaluatingJavaScriptFromString:@"document.title"];//获取当前页面的title
NSString *html = @"document.documentElement.innerHTML";//获取当前网页的html
NSString *html2 = [webView stringByEvaluatingJavaScriptFromString:@"document.getElementById('creditNum').innerText"];//获取id为creditNum标签的值
NSString *html3 = [webView stringByEvaluatingJavaScriptFromString:@"document.getElementById('zmScore').value"];//获取标签为id为zmScore的value
NSString *html2 = [webView stringByEvaluatingJavaScriptFromString:@"document.getElementsByTagName('p')[0].innerText"];//获取标签第一个p的值
NSString *html2 = [webView stringByEvaluatingJavaScriptFromString:@"document.body.innerText"];//获取body里面的全部内容
}
附html代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>1234</title>
</head>
<style type="text/css">
.issue{
font-family: "微软雅黑";
font-size: 1.2em;
font-weight: 900;
}
.answer{
font-family: "微软雅黑";
font-size: 1em;
margin-top:-15px;
}
</style>
<body>
<input type='hidden' id='zmScore' value='719'/><input type='hidden' id='freeDeposit' value='true'/>
<p id="creditNum"> 791 </P>
<p class="issue">Q：什么是骑行券？</p>
<p class="answer">A：骑行费用的电子券。</p>
<p class="issue">Q：如何获得骑行券？</p>
<p class="answer">A：关注运营方举办的活动。</p>
<p class="issue">Q：如何使用骑行券？</p>
<p class="answer">A：无需用户手动选择。</p>
<p class="issue">Q：一次骑行能有几张骑行券？</p>
<p class="answer">A：每次骑行结算只能使用一张骑行券。</p>
</body>
</html>
持续更新中 ～ (🙈)
