SwiftUI Previews not working with Firebase

Question

Created Aug ’20

Replies 18

Boosts 2

Views 46k

Participants 22

SwiftUI previews don't seem to work in Xcode 12, beta 5, when using Firebase Analytics. The app builds and runs fine to simulator or device, but fails generating SwiftUI preview for a widget with the following message:

Code Block ld: in /Users/../.../Pods/FirebaseAnalytics/Frameworks/FIRAnalyticsConnector.framework/FIRAnalyticsConnector(FIRAnalyticsConnector_e321ed8e3db06efc9803f6c008e67a34.o), building for iOS Simulator, but linking in object file built for iOS, file '/Users/.../.../Pods/FirebaseAnalytics/Frameworks/FIRAnalyticsConnector.framework/FIRAnalyticsConnector' for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

It was working fine in beta 4. Anyone else seen this? Any ideas?

Answered by tripletee in 628433022

I've seen quite a bit of weird behavior with frameworks, I think due to changes to the simulators to support Apple silicon. My temporary workaround is, in my app/extension targets, to add "arm64" to the Excluded Architectures build setting when building for the simulator (as your preview appears to be trying to do), and setting "Build Active Architecture Only" to No for all schemes. Might be worth a try.

Boost

Answer 1

Buju77 OP

Oct ’20

This looks very much like a Xcode 12 bug. Did anybody already filed a bug in feedback assistant?

0

Answer 2

albertine OP

Jun ’21

Still hitting this issue on XCode 12.5. I've introduced a new SwiftUI class to an existing UIKit app, and had issues with previewer working.

I was planning to learn SwiftUI in a few hours, but I ended up getting stuck on this :)

0

Answer 3

AdamShinder OP

Oct ’21

Hi,

I'm having the same issue. When I exlude arm64, it reads

"Merging extracted architectures: error: lipo: no input files specified"

I can't find the solution to this answer message anywhere. Any help would be greatly appreciated.

Best, Adam

0