UIWebView开发中,js与oc,js与swift交互,相互传递参数的方法

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原作者: [db:作者] 来自: [db:来源] 收藏邀请

实际开发中经常遇到需要向webView传递参数或从webView取参数,在此写了个超简单的demo供大家参考,本人js刚学了一天,所以不足之处海涵.

废话不多说,直接上代码

oc版

 1 #import "ViewController.h"
 2 @interface ViewController ()<UIWebViewDelegate>
 3 @property (nonatomic, strong)UIWebView * webView;
 4 @end
 5 
 6 @implementation ViewController
 7 
 8 - (void)viewDidLoad {
 9     [super viewDidLoad];
10     // Do any additional setup after loading the view, typically from a nib.
11     self.view.backgroundColor = [UIColor whiteColor];
12     self.title = @"Web Test";
13     [self.view addSubview:self.webView];
14 }
15 
16 -(UIWebView *)webView{
17     if (!_webView) {
18         _webView = [[UIWebView alloc] initWithFrame:[UIScreen mainScreen].bounds];
19         _webView.delegate = self;
20         NSString *filePath = [[NSBundle mainBundle] pathForResource:@"test" ofType:@".html"];
21         NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:filePath]];
22         [_webView loadRequest:request];
23     }
24     return _webView;
25 }
26 
27 - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{
28     
29     if ([request.URL.absoluteString hasSuffix:@"clickLoginBtn"]) {
30 //        向js传递数据
31         [_webView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"loginCallBack('I am id from app','I am token from app')"]];
32 //        从js获取数据
33         NSString *webData = [_webView stringByEvaluatingJavaScriptFromString:@"returnData();"];
34         NSLog(@"%@",webData);
35         
36         [_webView stopLoading];
37     }
38     return YES;
39 }

主要方法就是在webView的代理中执行: stringByEvaluatingJavaScriptFromString:@"JS的方法名"这个方法,即可在web中调用js的函数

 1 <!DOCTYPE HTML>
 2 <html>
 3     
 4     <head>
 5         
 6         <script>
 7             function loginCallBack(id,token){
 8                 var x=document.getElementById("logindata");
10                 alert(id)
11                 alert(token)
12             }
13             </script>
14         
15     </head>
16     
17     <body>
18         <h2  align= center>Clict To Transmit Data</h2>
19         <button  >login</button>
20         <script >
21             function buttonClick()
22             {
　　　　　　　　　　　　//webview重定向
23                 document.location = "clickLoginBtn"
24             }  
25             function returnData(){
26                 return document.getElementById("logindata").script
27             }
28         </script>
29     </body>
30 </html>

写在<script></script>间的function函数会被oc的上述方法调用,再根据函数的类型,传入参数和传出参数,即可实现oc与js相互间传递参数了.

注意,当点击web上的按钮时,执行buttonClick方法,但若不为web页面重定向,就不会发送新的request请求,不会执行webview中的代理方法,代理方法也就不会被执行,而代理方法的执行是传递参数的前提条件,所以一定不要忘了给webview重定向.

Swift版

基本原理就这些,下面再附上swift与js的交互,原理是相通的

swift代码

 1 import UIKit
 2 class ViewController: UIViewController ,UIWebViewDelegate{
 3 
 4     override func viewDidLoad() {
 5         super.viewDidLoad()
 6         // Do any additional setup after loading the view, typically from a nib.
 7         
 8         self.title = "Web-JS Test"
 9         self.view.backgroundColor = UIColor.blueColor()
10         
11         let filePath : String = NSBundle.mainBundle().pathForResource("test", ofType: ".html")!
12         let request = NSURLRequest.init(URL: NSURL(fileURLWithPath: filePath))
13         
14         let webView = UIWebView.init(frame: UIScreen.mainScreen().bounds)
15         webView.delegate = self;
16         self.view.addSubview(webView)
17         
18         webView.loadRequest(request)
19 
20     }
21     func webView(webView: UIWebView, shouldStartLoadWithRequest request: NSURLRequest, navigationType: UIWebViewNavigationType) -> Bool {
22         //核心代码
23         if request.URL!.absoluteString.hasSuffix("url"){
24             let id = "'I am id from app'"
25             let tocken = "'I am tocken from app'"
26 //            向h5传递参数
27             webView.stringByEvaluatingJavaScriptFromString("sendDataToWeb(\(id) , \(tocken))")
28 //            从h5接收参数
29             let returnStr = webView.stringByEvaluatingJavaScriptFromString("getDataFromWeb()")
30             print(returnStr)
31             webView.stopLoading()
32         }
33         return true
34     }

js代码

 1 <!DOCTYPE HTML>
 2 <html>
 3     <body>
 4         <h2 align=center  >Click To Transmit Data</h2>
 5         <button  align=center>login</button>
 6         <script>
 7             function buttonClick()
 8             {
 9                 //重指向
10                 document.location = "url"
11             }
12         
13             function sendDataToWeb(id,token){
14                 alert(id)
15                 alert(token)
16                 document.getElementById("logindata").innerHTML = "Data Transmit Complete"
17             }
18         
19             function getDataFromWeb(){
20                 return "I am a string from web "
21             }
22         
23         </script>
24 
25 
26     </body>
27 </html>