ios--OC调用JS并获得返回值(实例)

原地址:http://www.2cto.com/kf/201402/281514.html

1、准备一个本地化的html网页,如jsIOS.html

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   <meta http-equiv= "content-type" content= "text/html;charset=utf-8" >
   <title>js调用oc</title>
   <script type= "text/javaScript" >
       function postStr(){
            return document.getElementById( "text1" ).value;
            //return "javaScript返回值啦";
       }
   </script>
 
 
<p><input type= "text" id= "text1" value= "返回值" ></p>

2、将此html文件放到项目代码目录里面,如图:

ios--OC调用JS并获得返回值(实例)_第1张图片


3、拖一个UIWebView控件和UIButton控件到xxxViewController对应的.xib或.storyboard视图的UIView上;

在xxxViewController的.h文件中分别声明UIWebView类型变量和UIButton类型的变量,以及一个按钮点击事件(并且跟视图里面的控件连线),

并且添加一个UIWebViewDelegate类型的委托。<喎�"http://www.2cto.com/kf/ware/vc/" target="_blank" class="keylink">vcD4KPHA+eHh4Vmlld0NvbnRyb2xsZXIuaM7EvP7E2sjdyOfPwqO6PC9wPgo8cD48L3A+CjxwIGNsYXNzPQ=="p1">

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# import <uikit uikit.h= "" >
 
@interface ViewController : UIViewController <uiwebviewdelegate>
@property (nonatomic,retain) IBOutlet UIWebView *webview;
@property (nonatomic,retain) IBOutlet UIButton *button;
-(IBAction)IOS_JS:(id)sender;
@end </uiwebviewdelegate></uikit>


4、在xxxViewController.m文件中实现通过点击事件,调用javaScript的方法并取得返回值。

代码如下:

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# import "ViewController.h"
 
@interface ViewController ()
 
@end
 
@implementation ViewController
@synthesize webview;
 
- ( void )viewDidLoad
{
     [ super viewDidLoad];
     //设置webView
     webview.backgroundColor = [UIColor clearColor];
     //webview.scalesPageToFit =YES;
     webview.delegate =self;
     //找到jsIOS.html文件的路径
     NSString *basePath = [[NSBundle mainBundle]bundlePath];
     NSString *helpHtmlPath = [basePath stringByAppendingPathComponent:@ "jsIOS.html" ];
     NSURL *url = [NSURL fileURLWithPath:helpHtmlPath];
     //加载本地html文件
     [webview loadRequest:[NSURLRequest requestWithURL:url]];
}
 
/*
  * 点击事件
  * 调用javaScript的方法postStr()并取得返回值
  * 输出返回值到控制台
  */
-(IBAction)IOS_JS:(id)sender
{
     NSString *str = [self.webview stringByEvaluatingJavaScriptFromString:@ "postStr();" ];
     NSLog(@ "JS返回值:%@" ,str);
}
 
 
- ( void )didReceiveMemoryWarning
{
     [ super didReceiveMemoryWarning];
}
@end

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