Xcode 12.3 SwiftUI Preview 1 of "Content View Previews" not found in any targets

user_519030 0
Viewed 5023

I see others post with issues using SwiftUI Previews in Xcode 11 and 12, but have not seen this issue elsewhere.

Older project that worked in Xcode 11, loaded in Xcode 12, fails to launch the preview, no matter how simple the Preview content.

Actual preview code:

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        Text("I heart Xcode")
            .previewDevice("iPhone 11")
    }
}

After clicking "Resume" or "Try Again":

CouldNotFindInputNodeInBuiltGraphError<XcodeGraphSource, PreviewInstance>: Preview 1 of "Content View Previews" not found in any targets

Preview 1 of "Content View Previews" must belong to at least one target in the current scheme in order to use previews

Element: PreviewInstance(destinationDescription: UVPreviewPipeline.AnyPreviewDestinationDescription(storage: UVPreviewPipeline.(unknown context at $1382211e0).AnyPreviewDestinationDescriptionBoxImpl<UVIntegration.SimulatorPreviewDestinationDescription>), previewIdentity: UVPreviewPipeline.PreviewIdentity(identifier: ContentView_Previews[0], description: contentType: Element contextType: application device: iPhone 11 index: 0 layout: device supportsLive: true supportsOnDevice: true), variant: nil, variantedIdentifier: ContentView_Previews[0], identifier: AnyHashable(ContentView_Previews[0]))

I only have one target, same as before, with no special configuration. I have tried reloading Xcode as well as copying all sources files to a new directory (saw that one somewhere).

Anyone else able to parse this error message or make a recommendation for how to fix SwiftUI previews?

Thanks.

swiftui xcode
7 Answers

My scenario and resolution is different for the above.

I encountered this error today when I moved all my views into a 'Views' group folder. Then my latest view would not generate a preview and xcode displayed the error reported.

Preview provider "Your View" must belong to at least one target in the current scheme in order to use previews

This error was pointing to an existing view I wasn't currently working on, but it was an opened tab.

I closed all the tabs with views that I had open prior to file restructuring. I then reopen the view I was working on and xcode began redisplaying previews.

user_13956070

By chance, I recognized why the previews were broken in my from-scratch-project. Reason was the "Versioning" build phase that I originally added during setup:

xcrun agvtool next-version -all

After wrapping that into a Previews check, everything's fine again:

if [ $ENABLE_PREVIEWS == "NO" ]
then
    xcrun agvtool next-version -all
fi
user_19827550

same error "Content View Previews" not found in any targets

the error occurred, after I moved ContentView.swift file to an folder App

enter image description here

my solution ✅

just needs to Restart your Xcode, and everything should be fine!

enter image description here

user_59344650

Preview provider "Your View" must belong to at least one target in the current scheme in order to use previews

I had this showing up . This came up when i moved my project to another system by compressing and transfer.

It started working after - i removed the pinned preview . enter image description here

user_26561690

My case, I moved to another group folder, but I solved clicking on: file right click > Delete > Remove Reference

Then I added back again to the project: file/folder right click > Add Files to "Project Name"...

user_131900570

I had this issue after moving some views to group folders, the issue was resolved after restarting Xcode.

user_90794110

Removing the reference and adding the file back to the Xcode worked for me.

user_156904110
Related