iOS 8 分享扩展附件 - Xcode - Swift

Question

我已经为我的iOS应用程序添加了共享扩展，并使用UIViewController创建了自定义UI，而不是默认的SLComposeServiceViewController。UI正在工作，但是如何引用选择要共享的文件？例如，如果我分享一张照片，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
            }

    })

此外，当所选的附件包含多个文件（照片或视频），或者是无效文件类型时，如何使扩展按钮消失？感激任何答案。提前感谢。

- Arvin Zadeh

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这个扩展的NSExtensionActivationRule是什么样子？ - Tom Harrington

Answer 1

这是我喜欢分享图片和文件的方式：

//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)

希望这能帮到你！

- tdh

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啊，这是用于应用内共享的，我想。我需要的是一种方法，使得当你在照片库或Safari中按下共享按钮时，它可以引用文件并将其转换为NSData。无论如何，谢谢了，这对我未来开发的游戏可能会有所帮助。 - Arvin Zadeh