Adding your sticker packs to Messages
Drag and drop your sticker pack into the Stickers asset catalog to let people access your stickers from Messages.
Overview
Sticker packs provide static sets of stickers, images that users can send inline as messages or peel off and attach to message bubbles in the transcript. Sticker packs don’t require any code. You add stickers by dragging image files into the Sticker Pack folder inside the Stickers asset catalog. People can use your stickers across the system outside of messages.
Valid image files meet the following specifications:
The image is a PNG, APNG, GIF, JPEG, HEIC, or HEICS file.
The file is less than 500 KB.
For the best results, use images that are between 100 x 100 and 206 x 206 points.
Messages supports three sticker sizes, which the system displays in a grid-based browser. In the Xcode Attributes inspector, pick one of the following sizes for your sticker pack:
Small. 100 x 100 points @3x (300 x 300 pixels).
Medium. 136 x 136 points @3x (408 x 408 pixels).
Large. 206 x 206 points @3x (618 x 618 pixels).
For optimal quality and performance, provide sticker images of the size you choose. For more information on creating animated stickers, see Creating Stickers with Motion. For more information on submitting Sticker packs to the App Store, see Preparing Sticker Submissions.
Specify sticker availability
You can either restrict your sticker pack to just Messages, or make it available throughout the system. To specify which apps your sticker pack is available in, update your Info.plist file. Add the NSStickerSharingLevel key inside your Messages extension’s Info.plist file. The value for this key is the string {OS}. Messages checks for the presence of the Info.plist key when your app launches outside of Messages. If you add this key to your app, your sticker pack doesn’t appear in the list.