Can not render SwiftUI preview from Cocoapods

Question

I have a SwiftUI struct in a common library that I ship to myself.

public struct NTextField: View {
    public var body: some View {
        Text("Hello, World!")
    }

    public init() {

    }
}

struct NTextField_Previews: PreviewProvider {
    static var previews: some View {
        NTextField()
    }
}

I click on the file and the WYSIWYG preview fails to load

When clicking 'Diagnostics' I see something like this:

Error Domain=com.apple.dt.UITestingAgent Code=-1 "failed to load library at path "/Users/<my_app_name>/Library/Developer/Xcode/DerivedData/<my_app_name>/Build/Intermediates.noindex/Previews/<my_app_name>/Products/Debug-iphonesimulator/<my_custom_pod>/<my_custom_pod>.framework/<my_custom_pod>": Library not loaded: 

Any ideas? I deleted derived data, cleaned and built.

Also found this on the cocoapods git hub issue tracker.

Answer 1

You could try adding this in your Podfile (as suggested by JamesHurst, cltnschlosser and andersio)

class Pod::Target::BuildSettings::AggregateTargetSettings
    alias_method :ld_runpath_search_paths_original, :ld_runpath_search_paths

    def ld_runpath_search_paths
        return ld_runpath_search_paths_original unless configuration_name == "Debug"
        return ld_runpath_search_paths_original + framework_search_paths
    end
end

class Pod::Target::BuildSettings::PodTargetSettings
    alias_method :ld_runpath_search_paths_original, :ld_runpath_search_paths

    def ld_runpath_search_paths
        return (ld_runpath_search_paths_original || []) + framework_search_paths
    end
end