iOS 8 共享扩展附件 - Xcode - Swift

Question

我向我的 iOS 应用程序添加了一个共享扩展，并使用 UIViewController 创建了一个自定义 UI，而不是默认的 SLComposeServiceViewController。 UI 工作正常，但我如何引用选择要共享的文件？例如，如果我在一张照片上点击分享，我如何引用该照片，并将其转换为 NSData。我目前有这段代码，但是当它运行时，数据似乎从未被初始化。我做错了什么？

    //Runs when button is pressed
    inputItem = extensionContext!.inputItems.first as NSExtensionItem
    attachment = inputItem.attachments![0] as NSItemProvider
    attachment.loadItemForTypeIdentifier(kUTTypeJPEG as String,
        options: nil,
        completionHandler: {(content, error: NSError!) in
            let url = content as? NSURL
            if let data = NSKeyedArchiver.archivedDataWithRootObject(url!) as NSData?{
                self.imageChosen = UIImage(data: data)!
                //Never runs
            }
            else {
                //Always runs
            }

    })

另外，当所选附件包含多个文件（照片或视频）或者是无效文件类型时，如何使扩展按钮消失。任何答案表示赞赏。提前致谢。

Answer 1

这是我更喜欢共享图像和文件的方式：

//when the share button is pressed, default share phrase is added, cropped image of highscore is added

    var sharingItems = [AnyObject]()

    var shareButtonHighscore = NSUserDefaults.standardUserDefaults().objectForKey("highscore") as Int!

    sharingItems.append("I am sharing \(shareButtonHighscore)!")

    UIGraphicsBeginImageContextWithOptions(UIScreen.mainScreen().bounds.size, false, 0);
    self.view.drawViewHierarchyInRect(view.bounds, afterScreenUpdates: true)
    var image:UIImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    sharingItems.append(image)

    let activityViewController = UIActivityViewController(activityItems: sharingItems, applicationActivities: nil)

    activityViewController.excludedActivityTypes = [UIActivityTypeCopyToPasteboard,UIActivityTypeAirDrop,UIActivityTypeAddToReadingList,UIActivityTypeAssignToContact,UIActivityTypePostToTencentWeibo,UIActivityTypePostToVimeo,UIActivityTypePrint,UIActivityTypeSaveToCameraRoll,UIActivityTypePostToWeibo]

    self.presentViewController(activityViewController, animated: true, completion: nil)

希望这会有所帮助！