ios--OC调用JS并获得返回值(实例)

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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(){
           returndocument.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:

\


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="">
 
@interfaceViewController : 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"
 
@interfaceViewController ()
 
@end
 
@implementationViewController
@synthesizewebview;
 
- (void)viewDidLoad
{
    [superviewDidLoad];
    //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
{
    [superdidReceiveMemoryWarning];
}
@end

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