Preloading App Data for Screenshots

AppDelegate.swift

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
	prepareForTestingUI()

	// Handle the actual launch of your application
}

private func prepareForTestingUI() {
	guard let contentsURL = Bundle.main.url(forResource: "UITests", withExtension: "xcappdata")?.appendingPathComponent("AppData") else {
		return
	}

	guard let destinationRoot = FileManager.default.urls(for: .libraryDirectory, in: .userDomainMask).last?.deletingLastPathComponent() else {
		return
	}

	guard let enumerator = Foundation.FileManager.default.enumerator(at: contentsURL, includingPropertiesForKeys: [.isDirectoryKey], options: [], errorHandler: nil) else {
		return
	}

	while let sourceURL = enumerator.nextObject() as? URL {
		guard let resourceValues = try? sourceURL.resourceValues(forKeys: [.isDirectoryKey]),
			let isDirectory = resourceValues.isDirectory,
			!isDirectory else { continue }

		let path = sourceURL.standardizedFileURL.path.replacingOccurrences(of: contentsURL.standardizedFileURL.path, with: "")
		let destinationURL = destinationRoot.appendingPathComponent(path)

		do {
			try Foundation.FileManager.default.createDirectory(at: destinationURL.deletingLastPathComponent(), withIntermediateDirectories: true, attributes: nil)
			try Foundation.FileManager.default.copyItem(at: sourceURL, to: destinationURL)
		}
		catch {}
	}
}

run-script-build-phase.sh

#!/bin/bash
if [[ ${CONFIGURATION} == "Debug" ]] && [[ ! -z ${FASTLANE_SNAPSHOT} ]]; then
    bundlePath="${CONFIGURATION_BUILD_DIR}/${CONTENTS_FOLDER_PATH}"
    cp -R "${SRCROOT}/AppData/UITests.xcappdata" $bundlePath
fi