How do I configure the predicate string for limiting videos below 1.5MB in the info.plist of an iOS Share Extension?

Question

Created Apr ’17

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I want to allow my users to share photos and videos into my app's social stream from the Photos, Clips and other apps. I know that an iOS Sharing Extension is the way to go and I've gotten the info.plist all set to allow me to get one of either, but I need to restrict the video file size to 1.5MB or so. I'll reencode it to get it a little smaller, but that is beside the point. :-) But I am stuck on configuring the predicate to limit the extension to firing on video files below this size. Here is what I have so far:

  <key>NSExtension</key>
  <dict>
  <key>NSExtensionAttributes</key>
  <dict>
  <key>NSExtensionActivationRule</key>
            <string>SUBQUERY (
                extensionItems,
                $extensionItem,
                SUBQUERY (
                $extensionItem.attachments,
                $attachment,
                (
                ANY ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.image"
                || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.png"
                || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.jpeg"
                || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.jpeg-2000"
                || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "com.compuserve.gif"
                || (ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.movie"
                    AND 1500000 > $attachment.filesize)
                )
                ).@count == 1
                ).@count == 1</string>
  </dict>
  <key>NSExtensionMainStoryboard</key>
  <string>MainInterface</string>
  <key>NSExtensionPointIdentifier</key>
  <string>com.apple.share-services</string>
  </dict>

Note that doing > 1500000 causes a build error. I have a weird feeling this is broken or won't work.

Thanks!

f-

Answered by DTS Engineer in 221947022

In the snippet you posted I presume that

$attachment

is expected to be of type

NSItemProvider

. But that type has no

filesize

property, or anything similar, so I can’t see how this would work.

Regardless, are you sure you want to filter yourself out based on file size? It’s reasonable to filter yourself based on file type because that’s clearly visible to the user. But filtering on file size is likely just to confuse folks: when they select video A your extension shows up but when they select video B it doesn’t. It might be a better UE to actually accept a large video and then tell the user why they can’t upload it.

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

Boost

Answer 1

DTS Engineer OP

Apple

Apr ’17

Accepted Answer

In the snippet you posted I presume that

$attachment

is expected to be of type

NSItemProvider

. But that type has no

filesize

property, or anything similar, so I can’t see how this would work.

Regardless, are you sure you want to filter yourself out based on file size? It’s reasonable to filter yourself based on file type because that’s clearly visible to the user. But filtering on file size is likely just to confuse folks: when they select video A your extension shows up but when they select video B it doesn’t. It might be a better UE to actually accept a large video and then tell the user why they can’t upload it.

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

0

Answer 2

fredthefourth OP

Apr ’17

Thanks, I did not think it was possible based on my research, but was hoping I missed something. I agree that this could be confusing. The alternative is to either do what you proposed or use a custom UIVController with our built in (and old) square video editor which limits the user to 15 seconds.

Cool, thanks!

0