Export Swift Playgrounds .ipa

ExportIPA.swift

import Foundation

// Export running app as .ipa, then return path to exported file.
// Returns String because app crashes when returning URL from async function for some reason...
func exportIPA() async throws -> String
{
    // Path to app bundle
    let bundleURL = Bundle.main.bundleURL
    
    // Create Payload/ directory
    let temporaryDirectory = FileManager.default.temporaryDirectory.appendingPathComponent(UUID().uuidString)
    let payloadDirectory = temporaryDirectory.appendingPathComponent("Payload")
    try FileManager.default.createDirectory(at: payloadDirectory, withIntermediateDirectories: true, attributes: nil)
    
    defer {
        // Remove temporary directory
        try? FileManager.default.removeItem(at: temporaryDirectory)
    }
    
    let appName = Bundle.main.object(forInfoDictionaryKey: kCFBundleNameKey as String) as? String ?? "App"
    let appURL = payloadDirectory.appendingPathComponent("\(appName).app")
    let ipaURL = FileManager.default.temporaryDirectory.appendingPathComponent("\(appName).ipa")
    
    // Copy app bundle to Payload/
    try FileManager.default.copyItem(at: bundleURL, to: appURL)
    
    // Remove occurrences of "swift-playgrounds-" from bundle identifier.
    // (Apple forbids registering App IDs containing that string)
    let bundleID = Bundle.main.bundleIdentifier!
    let updatedBundleID = bundleID.replacingOccurrences(of: "swift-playgrounds-", with: "")
    
    // Update bundle identifier
    let plistURL = appURL.appendingPathComponent("Info.plist")
    let infoPlist = try NSMutableDictionary(contentsOf: plistURL, error: ())
    infoPlist[kCFBundleIdentifierKey as String] = updatedBundleID
    try infoPlist.write(to: plistURL) 
    
    try await withCheckedThrowingContinuation { (continuation: CheckedContinuation<Void, Error>) in
        // Coordinating read access to Payload/ "forUploading" automatically zips the directory for us.
        let readIntent = NSFileAccessIntent.readingIntent(with: payloadDirectory, options: .forUploading)
        
        let fileCoordinator = NSFileCoordinator()
        fileCoordinator.coordinate(with: [readIntent], queue: .main) { error in
            do
            {
                guard error == nil else { throw error! }
                
                // Change file extension from "zip" to "ipa"
                _ = try FileManager.default.replaceItemAt(ipaURL, withItemAt: readIntent.url)
                
                print("Exported .ipa:", ipaURL)
                continuation.resume()
            }
            catch
            {
                print("Failed to export .ipa:", error)
                continuation.resume(throwing: error)
            }
        }
    }
    
    return ipaURL.path
}

ExportView.swift

// Example exportIPA() usage

import SwiftUI
import UniformTypeIdentifiers

extension UTType
{
    static let ipa = UTType(filenameExtension: "ipa")!
}

struct IPAFile: FileDocument
{
    let file: FileWrapper
    
    static var readableContentTypes: [UTType] { [.ipa] }
    static var writableContentTypes: [UTType] { [.ipa] }
    
    init(ipaURL: URL) throws
    {
        self.file = try FileWrapper(url: ipaURL, options: .immediate)
    }
    
    init(configuration: ReadConfiguration) throws 
    {
        self.file = configuration.file
    }
    
    func fileWrapper(configuration: WriteConfiguration) throws -> FileWrapper 
    {
        return self.file
    }
}

struct ExportView: View 
{
    @State 
    private var isExporting = false
    
    @State
    private var ipaFile: IPAFile?
    
    var body: some View {
        VStack(spacing: 25) {
            Button(action: export) { 
                Label("Export IPA", systemImage: "square.and.arrow.up")
                    .imageScale(.large)
                    .foregroundColor(.accentColor)
            }
        }
        .fileExporter(isPresented: self.$isExporting, document: self.ipaFile, contentType: .ipa) { result in
            print("Exported IPA:", result)
        }
    }
    
    private func export()
    {
        Task { @MainActor in            
            do
            {
                let ipaPath = try await exportIPA()
                let ipaURL = URL(fileURLWithPath: ipaPath)
                
                self.ipaFile = try IPAFile(ipaURL: ipaURL)
                self.isExporting = true
            }
            catch
            {
                print("Could not export .ipa:", error)
            }
        }
    }
}

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