访问共享扩展中的网页属性

Question

当用户使用JavaScript文件在iOS上打开共享扩展时，我想访问网页属性（标题，元描述，URL，默认图像等）。我使用的JavaScript（https://developer.apple.com/library/prerelease/ios/documentation/General/Conceptual/ExtensibilityPG/ExtensionScenarios.html#//apple_ref/doc/uid/TP40014214-CH21-SW12）下面的代码：

var MyExtensionJavaScriptClass = function() {}; 

MyExtensionJavaScriptClass.prototype = { 
    run: function(arguments) { 
    // Pass the baseURI of the webpage to the extension. 
     arguments.completionFunction({"url": document.baseURI}); 
     arguments.completionFunction({"host": getHost()}); 
     arguments.completionFunction({"title": document.title}); 
     arguments.completionFunction({"description": getDescription()}); 
     arguments.completionFunction({"image": getImage()}); 
    }, 
    getHost: function() { 
     var l = document.createElement("a"); 
     l.href = href; 
     return l.hostname; 
    }, 
    getDescription: function() { 
     var metas = document.getElementsByTagName('meta'); 

     for (i=0; i<metas.length; i++) { 
      if (metas[i].getAttribute("property") == "description") { 
      return metas[i].getAttribute("content"); 
      } 
     } 
     return ""; 
    }, 
    getImage: function() { 
     // Need to find this out 
     return ""; 
    }, 
// Note that the finalize function is only available in iOS. 
    finalize: function(arguments) { 
     // arguments contains the value the extension provides in [NSExtensionContext completeRequestReturningItems:completion:]. 
    // In this example, the extension provides a color as a returning item. 
    document.body.style.backgroundColor = arguments["bgColor"]; 
    } 
}; 

// The JavaScript file must contain a global object named "ExtensionPreprocessingJS". 
var ExtensionPreprocessingJS = new MyExtensionJavaScriptClass; 

这是访问的网页特性也什么是在内容获取第一图像的最佳方法的正确途径。

任何帮助将不胜感激。

Answer 1

这是我如何解决这个问题。

JS代码：

var MyExtensionJavaScriptClass = function() {}; 

MyExtensionJavaScriptClass.prototype = { 
    getDescription: function() { 
     var metas = document.getElementsByTagName('meta'); 
     for (i=0; i<metas.length; i++) { 
      if (metas[i].getAttribute("name") == "description") { 
       return metas[i].getAttribute("content"); 
      } 
     } 
     return ""; 
    }, 
    getImage: function() { 
     var metas = document.getElementsByTagName('meta'); 
     for (i=0; i<metas.length; i++) { 
      if (metas[i].getAttribute("name") == "og:image" || metas[i].getAttribute("name") == "sailthru.image.full" || metas[i].getAttribute("name") == "twitter:image:src") { 
       return metas[i].getAttribute("content"); 
      } 
     } 
     return ""; 
    }, 
    run: function(arguments) { 
    // Pass the baseURI of the webpage to the extension. 
     arguments.completionFunction({"url": document.baseURI, "host": document.location.hostname, "title": document.title, "description": this.getDescription(), "image": this.getImage()}); 
    }, 
// Note that the finalize function is only available in iOS. 
    finalize: function(arguments) { 
     // arguments contains the value the extension provides in [NSExtensionContext completeRequestReturningItems:completion:]. 
    // In this example, the extension provides a color as a returning item. 
    // document.body.style.backgroundColor = arguments["bgColor"]; 
    } 
}; 

// The JavaScript file must contain a global object named "ExtensionPreprocessingJS". 
var ExtensionPreprocessingJS = new MyExtensionJavaScriptClass; 

// ExtensionPreprocessingJS.test(); 

Swift代码：

for item: AnyObject in (self.extensionContext?.inputItems)! { 
    let inputItem = item as! NSExtensionItem 

    for provider: AnyObject in inputItem.attachments! { 
     let itemProvider = provider as! NSItemProvider 

     if itemProvider.hasItemConformingToTypeIdentifier(kUTTypePropertyList as String) { 
      itemProvider.loadItemForTypeIdentifier(kUTTypePropertyList as String, options: nil, completionHandler: { (result: NSSecureCoding?, error: NSError!) -> Void in 
       if let resultDict = result as? NSDictionary { 
        self.articleTitle = resultDict[NSExtensionJavaScriptPreprocessingResultsKey]!["title"] as! String 
        self.articleHost = resultDict[NSExtensionJavaScriptPreprocessingResultsKey]!["host"] as! String 
        self.articleDesc = resultDict[NSExtensionJavaScriptPreprocessingResultsKey]!["description"] as! String 
        self.articleImage = resultDict[NSExtensionJavaScriptPreprocessingResultsKey]!["image"] as! String 
        self.articleUrl = resultDict[NSExtensionJavaScriptPreprocessingResultsKey]!["url"] as! String 
       } 
      }) 
     } 
    } 
}