Previews are not building for the SwiftDataCardSample project.

App & System Services iCloud & Data
bdunay3 OP
Created Jul ’23
Replies 4
Boosts 0
Views 1k
Participants 3

I set my active schema to SwiftDataCardSampleEnd, open ContentView.swift, and bring up the Canvas. When I click the little refresh button I get the follow error from Canvas:

== DATE:

    Friday, July 14, 2023 at 9:02:26 AM Eastern Daylight Time
    
    2023-07-14T13:02:26Z



== PREVIEW UPDATE ERROR:

    SchemeBuildError: Failed to build the scheme ”SwiftDataFlashCardSampleEnd”
    
    linker command failed with exit code 1 (use -v to see invocation)
    
    Link SwiftDataFlashCardSample (arm64):
    ld: Undefined symbols:
      unsafeMutableAddressor of self #1 : SwiftDataFlashCardSample.Card in SwiftDataFlashCardSample.Card.creationDate.init : Foundation.Date, referenced from:
          SwiftDataFlashCardSample.Card.creationDate.init : Foundation.Date in Card.o
      unsafeMutableAddressor of self #1 : SwiftDataFlashCardSample.Card in SwiftDataFlashCardSample.Card.back.init : Swift.String, referenced from:
          SwiftDataFlashCardSample.Card.back.init : Swift.String in Card.o
      unsafeMutableAddressor of self #1 : SwiftDataFlashCardSample.Card in SwiftDataFlashCardSample.Card.front.init : Swift.String, referenced from:
          SwiftDataFlashCardSample.Card.front.init : Swift.String in Card.o
    clang: error: linker command failed with exit code 1 (use -v to see invocation)

I've made a similar preview in another project where I define a model and I try to use that model in a SwiftUI Canvas preview. I get a very similar error. Basically Canvas is saying it can't find the symbols for the properties on the type.

Is there something I'm missing here? Some hidden build setting I need to flip. Or is this just busted?

Replies  4
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Views  1k
Participants  3
bdunay3 OP
Jul ’23

Here's the bottom half of the error if Apple is watching this post:

== VERSION INFO:

    Tools: 15A5195m
    OS:    23A5286i
    PID:   29967
    Model: Mac Studio
    Arch:  arm64e



== ENVIRONMENT:

    openFiles = [
        /Users/bdunay3/Desktop/BuildingADocumentBasedAppUsingSwiftData/End/FlashCard/Views/ContentView.swift
    ]
    wantsNewBuildSystem = true
    newBuildSystemAvailable = true
    activeScheme = SwiftDataFlashCardSampleEnd
    activeRunDestination = My Mac variant macos arm64
    workspaceArena = [x]
    buildArena = [x]
    buildableEntries = [
        SwiftDataFlashCardSample.app
    ]
    runMode = Dynamic Replacement



== SELECTED RUN DESTINATION:

    name = My Mac
    eligible = true
    sdk = Optional(<DVTSDK:0x10eb17360:'macosx14.0':macOS 14.0:<DVTFilePath:0x6000028b8f50:'/Applications/Xcode-15.0.0-Beta.4.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.0.sdk'>>)
    variant = Optional("macos")
    device = Optional(<DVTLocalComputer: 0x291b0a730 (My Mac | arm64e)>)



== SELECTED RUN DESTINATION:

    macOS 14.0 | macos | arm64 | Mac Studio | no proxy



== PACKAGE RESOLUTION ERRORS:

    



== REFERENCED SOURCE PACKAGES:

    



== SESSION GROUP 2637:

    workspace identifier: WorkspaceIdentifier(identifier: F623C971-5AC9-46B9-9C82-D7F18AD4FF9A)
    providers: [
        Preview Provider | Registry-ContentView.swift#1 [Editor(2608)]
    ]
    translation units: [
        /Users/bdunay3/Desktop/BuildingADocumentBasedAppUsingSwiftData/End/FlashCard/Views/ContentView.swift
    ]
    attributes: [
        Editor(2608):     []
    ]
    session: 2638
    request sessions: [
        Registry[ContentView.swift #1 (line 35)]: not completed
    ]



== UPDATE SESSION 2638:

    Start Date: Friday, July 14, 2023 at 9:02:16 AM Eastern Daylight Time
    Preview Provider {
        UpdaterStore {
            updaterLimit: none
            expectedAbandonedIdentifiers: []
        }
        My Mac {
            dvtDevice: My Mac
            buildNumber: 14.0 (23A5286i)
            arch: arm64e
        }
    }
    Preview Preflight {
        UpdaterStore {
            updaterLimit: none
            expectedAbandonedIdentifiers: []
        }
        My Mac {
            dvtDevice: My Mac
            buildNumber: 14.0 (23A5286i)
            arch: arm64e
        }
    }
    Build Graph {
        target app SwiftDataFlashCardSample.app (#1)
           translationUnit ContentView.swift (#2)
           Preview Preflight | Registry-ContentView.swift#1: from Editor(2608) for local Preview Preflight | Registry-ContentView.swift#1: from Editor(2608) for local (#3)
           Preview Provider | Registry-ContentView.swift#1 [Editor(2608)] Preview Provider | Registry-ContentView.swift#1 [Editor(2608)] (#4)
    }
    Update Plan {
        macOS [arm64 macosx14.0 macos] (Mac Studio, 00006022-001808603C02201E-macosx14.0-arm64-macos), [], thinning enabled) {
            Destination: My Mac dvtdevice-local-computer:localhost | default device for macos [
                SwiftDataFlashCardSample app - Previews {
                    execution points [
                        point Preview Preflight | Registry-ContentView.swift#1: from Editor(2608) for local
                        provider SwiftDataFlashCardSample.Registry[ContentView.swift #1 (line 35)]
                    ]
                    translation units [
                        ContentView.swift (in SwiftDataFlashCardSample.app)
                    ]
                    modules [
                        SwiftDataFlashCardSample.app
                    ]
                }
            ]
        }
    }



== POWER STATE LOGS:

    7/14/2023, 9:02 AM Received power source state: Externally Powered
    7/14/2023, 9:02 AM No device power state user override user default value.Current power state: Full Power
0
macrojd OP
Jul ’23

It is a bug. In Beta 3 it was possible to embed the preview code in MainActor.assumeIsolated { }, but this patch no longer works in Beta 4. They are now recommending to run the SwiftData apps in the simulator or a device until they fix the bug.

0
bdunay3 OP
Jul ’23

Thank you! If possible could you post a link to where you found that information. Just trying to keep track of current state for when boss asks.

Thanks again!!

0
kr1shnak OP
Jul ’23

The information about Previews not working with SwiftData is listed in the release notes for Xcode 15 Beta 4.

Hope this helps.

0
Previews are not building for the SwiftDataCardSample project.
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