javascript - 访问共享扩展中的网页属性

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)。我正在为 javascript ( https://developer.apple.com/library/prerelease/ios/documentation/General/Conceptual/ExtensibilityPG/ExtensionScenarios.html#//apple_ref/doc/uid/TP40014214-CH21-SW12 ) 使用以下代码:

    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;

这是访问网页属性的正确方法还是获取内容中第一个图像的最佳方法。

任何帮助将非常感激。

最佳答案

这是我解决这个问题的方法。

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
                }
            })
        }
    }
}