PreviewProviderFileLocations

import SwiftUI

struct PreviewLocation: ViewModifier {
    enum LocationDir {
        case documentsDirectory
        case applicationSupportDirectory
    }
    let directory: LocationDir
    
    func body(content: Content) -> some View {
            ZStack {
                content
                Group {
                    switch directory {
                    case .documentsDirectory:
                        Text(URL.documentsDirectory.path(percentEncoded: false))
                            
                    case .applicationSupportDirectory:
                        Text(URL.applicationSupportDirectory.path(percentEncoded: false))
                    }
                }
                .textSelection(.enabled)
                .padding()
                .background(RoundedRectangle(cornerRadius: 10).fill(Color(.systemBackground).shadow(.drop(radius: 5))))
                .padding()
            }
    }
}

extension View {
    func showPreviewLocation(_ directory: PreviewLocation.LocationDir) -> some View {
        modifier(PreviewLocation(directory: directory))
    }
}