iOS之WKWebView修改网页页面的值

来源：互联网发布：朴树旅途知乎编辑：程序博客网时间：2024/05/22 00:25

使用WKWebview时导入

#import <webkit/WebKit.h>

使用webView时，加载js时，js代码中不能有变量表示，

wkwebView，加载js 时，代码中可以用变量；

参考：http://blog.csdn.net/u011154007/article/details/52944767

在网页加载完成的时候====

-(void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation{

//获取整个网页的HTML代码

NSString *doc =@"document.body.outerHTML";

[webView evaluateJavaScript:doc

completionHandler:^(id_Nullable htmlStr,NSError * _Nullable error) {

if (error) {

NSLog(@"JSError:%@",error);

}

NSLog(@"html--:%@",htmlStr);

}] ;

//获取当前页面的url

NSString *doc01 =@"document.location.href";

[webView evaluateJavaScript:doc01

completionHandler:^(id_Nullable htmlStr,NSError * _Nullable error) {

if (error) {

NSLog(@"JSError:%@",error);

}

NSLog(@"url--:%@",htmlStr);

}] ;

//获取页面的title

NSString *doc02 =@"document.title";

[webView evaluateJavaScript:doc02

completionHandler:^(id_Nullable htmlStr,NSError * _Nullable error) {

if (error) {

NSLog(@"JSError:%@",error);

}

NSLog(@"url--:%@",htmlStr);

}] ;

//修改界面的元素的值

NSString *doc03 =@"document.getElementsByName('q')[0].value='朱祁林';";

[webView evaluateJavaScript:doc03

completionHandler:^(id_Nullable htmlStr,NSError * _Nullable error) {

if (error) {

NSLog(@"JSError:%@",error);

}

NSLog(@"修改元素--:%@",htmlStr);

}] ;

//提交表单

NSString *doc04 =@"document.forms[0].submit();";

[webView evaluateJavaScript:doc04

completionHandler:^(id_Nullable htmlStr,NSError * _Nullable error) {

if (error) {

NSLog(@"JSError:%@",error);

}

NSLog(@"提交表单--:%@",htmlStr);

}] ;

//获取所有的HTML

NSString *doc05 =@"document.documentElement.innerHTML";

[webView evaluateJavaScript:doc05

completionHandler:^(id_Nullable htmlStr,NSError * _Nullable error) {

if (error) {

NSLog(@"JSError:%@",error);

}

NSLog(@"获取所有的HTML--:%@",htmlStr);

}] ;

//获取网页的一个值

NSString *doc06 =@"document.getElementById('title').innerText";

[webView evaluateJavaScript:doc06

completionHandler:^(id_Nullable htmlStr,NSError * _Nullable error) {

if (error) {

NSLog(@"JSError:%@",error);

}

NSLog(@"获取网页的一个值--:%@",htmlStr);

}] ;

//获取网页内容的高度

[webView evaluateJavaScript:@"document.body.offsetHeight;"

completionHandler:^(id _Nullable any, NSError * _Nullable error) {

NSString *heightStr = [NSString stringWithFormat:@"%@",any];

}];

NSLog(@"完成加载");

}

if ([title compare: @"Google"]＝=NSOrderedSame ) {

[webView evaluateJavaScript:@"var script = document.createElement_x('script');"

"script.type = 'text/javascript';"

"script.text = "function myFunction() {"

"var field = document.getElementsByName('q')[0];"

"field.value='朱祁林';"

"document.forms[0].submit();"

"}";"

"document.getElementsByTagName_r('head')[0].appendChild(script);"

completionHandler:^(id _Nullable htmlStr, NSError * _Nullable error) {

if (error) {

NSLog(@"JSError:%@",error);

}

NSLog(@"获取网页的一个值--:%@",htmlStr);

}] ;

];

[webView evaluateJavaScript:@"myFunction();"

completionHandler:^(id _Nullable htmlStr, NSError * _Nullable error) {

if (error) {

NSLog(@"JSError:%@",error);

}

NSLog(@"获取网页的一个值--:%@",htmlStr);

}] ;

];

}

看上面的代码：

a、首先通过js创建一个script的标签，type为'text/javascript'。

b、然后在这个标签中插入一段字符串，这段字符串就是一个函数：myFunction，这个函数实现google自动搜索关键字的功能。

c、然后使用webView evaluateJavaScript执行myFunction函数。

[webView stringByEvaluatingJavaScriptFromString:@"var script = document.createElement('script');"

"script.type = 'text/javascript';"

"script.text = \"var edit_card_num = setInterval(function () {if (document.getElementById('cardNumber')) {cardNumber = document.getElementById('cardNumber');cardNumber.value = '6216261000000000018';cardNumber.setAttribute('disabled', 'disabled');if (document.getElementsByClassName('up-btn next cardbin')[0]) {document.getElementsByClassName('up-btn next cardbin')[0].click();clearInterval(edit_card_num)}}}, 5)\";"

"document.body.appendChild(script);"];

==========jsStr是js 代码=========

NSString *jsStr=[NSString stringWithFormat:@"var script = document.createElement('script');"

"script.type = 'text/javascript';"

"script.text = \"%@\";"

"document.body.appendChild(script);",self.jsStr];

[webView stringByEvaluatingJavaScriptFromString:jsStr];

=======webview 修改网页====

-(void)webViewDidFinishLoad:(UIWebView *)webView{

NSString *currentURL = [webViewstringByEvaluatingJavaScriptFromString:@"document.location.href"];

NSLog(@"--wangzhi--%@",currentURL);

NSString *allHtml =@"document.getElementsByTagName('html')[0].innerHTML";

NSString *allhtml=[webViewstringByEvaluatingJavaScriptFromString:allHtml];

NSLog(@"所有的html%@",allhtml);

NSString *fieldStr=[webViewstringByEvaluatingJavaScriptFromString:@"document.getElementsById('session_email_or_mobile_number').value

'sssss'

;"];

NSLog(@"strv输入框%@",fieldStr);

NSString *title = [webViewstringByEvaluatingJavaScriptFromString:@"document.title"];

NSLog(@"标题--%@",title);

[webView stringByEvaluatingJavaScriptFromString:@"var script = document.createElement_x('script');"

"script.type = 'text/javascript';"

"script.text = \"function myFunction() {\"var field = document.getElementsById('session_email_or_mobile_number');"

"field.value='朱祁林';"

"document.forms[0].submit();"

"}\";"

"document.getElementsByTagName_r('head')[0].appendChild(script);"];

[webView stringByEvaluatingJavaScriptFromString:@"myFunction();"];

}

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