Build an iMessage sticker pack in iOS using Xcode 26's Sticker Pack App template with prepared PNG or GIF images. No Swift code is required.
Understanding Sticker Pack Formats
A sticker pack is an iMessage app extension that displays images in a grid. Users tap a sticker to send it in a Messages conversation. Xcode supports three image formats: PNG, GIF, and JPG. PNG with transparency produces the best visual quality.
Sticker size determines the grid column count. Small stickers display in 4 columns. Regular stickers display in 3 columns. Large stickers display in 2 columns. Each sticker image must be under 500 KB.
Preparing Sticker Images
Create your sticker images before opening Xcode. Use PNG format for static stickers with transparent backgrounds. Use GIF or APNG format for animated stickers.
Keep each file under 500 KB. Large files slow down the sticker browser and increase the initial download size. Use consistent dimensions within your pack for a polished appearance.
Creating the Sticker Pack Project in Xcode 26
Open Xcode 26 and create a new project. Select the iOS tab and choose Sticker Pack App. Click Next.
Enter your project name and team information. Xcode generates a minimal project with a Stickers folder and an asset catalog. The project contains no Swift files.
Adding Images to the Sticker Pack
In the Project Navigator, locate the Stickers folder. Click the Sticker Pack subfolder. Open Finder and drag your prepared images directly into this folder in Xcode. Xcode arranges them into the grid layout automatically.
Set the appropriate sticker size in the Attributes inspector to control the grid column count.
Adding App Icons
Every sticker pack requires an iMessage app icon. Provide multiple icon sizes for different contexts.
1024x768 points for the Messages App Store. 27x20 points for the Messages app drawer. 60x45 points for iPhone Messages. 67x50 points for iPad Messages. 74x55 points for iPad Pro Messages.
Drag all icon variants into the iMessage App Icon section of the asset catalog.
Testing the Sticker Pack
Select a simulated device such as iPhone 16 Pro. Click Run. Xcode loads the sticker pack into the Messages app on the simulator.
If the sticker pack does not appear automatically, open Messages, tap the app drawer button, tap Edit, and toggle your sticker pack on.
The Messages simulator includes two simulated users. Select a sticker and press Return to send it. Switch to the other user's conversation to see the received sticker.
Troubleshooting Simulator Crashes
Some developers encounter a scroll-to-invalid-index-path crash when running a sticker pack. To work around this issue, exit the Messages app in the simulator, relaunch it, and enable the sticker pack manually through the app drawer's Edit button.
Adding Animated Stickers
Animated stickers increase engagement. Drag animated GIF or APNG files into the Sticker Pack folder alongside static images. Xcode plays the animation automatically in the Messages browser.
For more control over animation timing, add a Sticker Sequence. Right-click in the Sticker Pack folder, choose Add Assets, and select New Sticker Sequence. Drag individual image frames into the sequence. Preview the animation by clicking the Play button in Xcode.
Adding a Sticker Pack to an Existing App
Open your existing Xcode project. Select the project in the Project Navigator. Go to Editor and choose Add Target. Select Sticker Pack Extension. Name your extension and confirm. Click Activate when prompted.
Xcode adds a Stickers folder to your existing project. Drag your sticker images into this folder. Users who download your main app will also have the sticker pack available in Messages.
Publishing Your Sticker Pack
After testing, archive the sticker pack in Xcode. Select Product and choose Archive. Xcode builds the extension and opens the Organizer window. Click Distribute App and select App Store Connect. Follow the prompts to upload your sticker pack.
Set a price tier or choose Free in App Store Connect. Provide a description, screenshots, and keywords for App Store search optimization.
Sticker Pack Structure Overview
Xcode creates a Sticker Pack Extension bundle within your app. The bundle contains an asset catalog with sticker image data. Each sticker occupies one cell in the grid. Reordering stickers in the asset catalog changes their display order in Messages.
The Info.plist for the extension includes a MessagesExtension key with sticker metadata. Xcode manages this file automatically.
Best Practices for Sticker Pack Design
Use bold shapes and high contrast. Stickers display at small sizes where fine details become invisible.
Keep each sticker under 500 KB. Large files degrade browsing performance and increase download size.
Use PNG with transparency. Stickers with transparent backgrounds overlay naturally on message bubbles. White or colored backgrounds look unprofessional.
Consider your brand. A sticker pack with recognizable characters is free marketing. Every sticker a user sends is an impression on the recipient.
Limit each sticker pack to a focused theme. Users prefer curated packs with a consistent visual style over large collections of unrelated images.
iMessage App Store Opportunity
The iMessage App Store has fewer apps than the main App Store. Less competition means better discoverability for your sticker pack. A well-designed pack can generate revenue or drive brand awareness with minimal development effort.
Summary
This tutorial covered the complete implementation process from setup to working code. You now have a functional implementation that you can extend and customize for your own projects. The same patterns apply to related features in the iOS ecosystem.
Frequently Asked Questions
What Xcode version do I need for this tutorial? This tutorial uses Xcode 26 with Swift 6.2. The code examples work with any recent version of Xcode that supports the frameworks used here.
Can I test this on the iOS Simulator? Some features require a physical device with a compatible processor. The article notes specific sections where the Simulator is sufficient and where a real device is required.
Do I need an Apple Developer Program membership to use this? Testing on a physical device requires a free Apple Developer account. Publishing to the App Store requires a paid Apple Developer Program membership.
What are the prerequisites for this tutorial? You need Xcode installed on a Mac and basic familiarity with Swift programming. No prior experience with the specific framework is required.