UIActivityViewController -无法同时AirDrop多个对象类型

Question

我希望能够使用UIActivityViewController同时AirDrop一个文本文件和一个图像。下面的代码可以很好地通过iMessage或eMail发送两种类型的文件，但当我尝试使用AirDrop时，它会失败。该代码适用于AirDropping 2图像或2个文本文件，但不适用于其中一个。

@IBAction func shareImage(_ sender: UIButton)
{
    // can't seem to AirDrop a mixture of file types. ie. can send 2 images, or 2 data files, but not an image and a data file
    let fileToSend: NSURL = NSURL(fileURLWithPath: dataFile!)
    let image = imageView.image!
    let objectsToShare = [fileToSend, image] as [Any]
    let controller = UIActivityViewController(activityItems: objectsToShare, applicationActivities: nil)

    controller.excludedActivityTypes = [UIActivityType.postToFacebook, UIActivityType.postToTwitter, UIActivityType.postToWeibo, UIActivityType.print, UIActivityType.copyToPasteboard, UIActivityType.assignToContact, UIActivityType.saveToCameraRoll, UIActivityType.postToFlickr, UIActivityType.postToTencentWeibo]
    self.present(controller, animated: true, completion: nil)
}