iOS build fails: glassEffect / GlassEffectContainer require iOS 26 SDK (Voltra 1.0.1)

[sandeepjohnsonosi]

Hi team,

I’m facing an iOS build failure when using Voltra v1.0.1 in an Expo / React Native project.

Library: voltra
Voltra Version: 1.0.1 (also tried 1.0.0)
Expo: ~53.0.22
React Native: 0.79.5
React: 19.0.0
iOS Deployment Target: 17.0
Xcode SDK: iOS 18.5
Node.js: 22.x
Package Manager: pnpm 10.x
Build Tool: Expo EAS Build

Issue
It looks like Voltra 1.0.1 is using iOS 26 APIs (glassEffect, GlassEffectContainer) which are not available in the current Xcode SDK (iOS 18.5).
Because of this, the iOS build fails.

⚠️ Note:
The build fails when using Expo EAS Build (eas build), but works locally in Xcode.

This makes it difficult to generate production builds using Expo.

Root Cause! 🔍
This is a Voltra library bug, The issue is:
Voltra 1.0.1 has Swift code that uses iOS 26 APIs (GlassEffectContainer, .glassEffect())
These APIs don't exist in the current Xcode SDK (iOS 18.5)
expo build iOS 26 SDK compile issue

Could you please advise if there is a workaround or planned fix for this?

Thanks.

[V3RON]

I assume you're building locally using the EAS CLI - is that correct? Is there anything preventing you from updating Xcode to the latest version?

If you're building remotely on EAS, is there anything preventing you from updating your runner image to the latest one? In the meantime, I'll see if I can wrap this code in an Xcode version check.

[sandeepjohnsonosi]

Hi, thanks for looking into this!

To answer your questions:

1. Build type: I'm using remote EAS Build (eas build), not local (eas build --local)

2. Why I can't just update the runner image:

   • The latest EAS Build images use Xcode 16.x with iOS SDK 18.5
   • iOS 26 SDK is not available in any public Xcode release yet
   • So even with the latest EAS image, the build fails

My environment:

• Expo: ~53.0.22
• React Native: 0.79.5
• iOS Deployment Target: 17.0
• EAS Build (remote) - default image
• Voltra: 1.0.1

The error:
The Swift code in Voltra uses GlassEffectContainer and .glassEffect() which require iOS 26 SDK, but EAS Build servers only have iOS SDK 18.5.

Questions:

1. Could you wrap the iOS 26 APIs with @available checks or #if compiler directives so it builds on older SDKs?
2. Is there an older version of Voltra that doesn't use iOS 26 APIs that I can use as a temporary workaround?

Thank you!

[V3RON]

@sandeepjohnsonosi

The latest EAS Build images use Xcode 16.x with iOS SDK 18.5

According to Expo's documentation on EAS, the latest macOS image includes XCode 26.

[sandeepjohnsonosi]

✅ Resolved - Thanks!

The issue is now fixed! Here's what worked:

Solution

Updated eas.json to use the latest EAS build image which includes Xcode 26: Expo's documentation on EAS

{
"build": {
"production": {
"ios": {
"image": "latest"
}
}
}
}
Thanks @V3RON for pointing me to the EAS documentation! 🙏