Getting version and build information with Swift

You can get that easily by using single variable and make it public. You can use it everywhere you want.

(I am getting here User Agent for API header)

public let userAgent: String = {
    if let info = Bundle.main.infoDictionary {
        let executable = info[kCFBundleExecutableKey as String] as? String ?? "Unknown"
        let bundle = info[kCFBundleIdentifierKey as String] as? String ?? "Unknown"
        let appVersion = info["CFBundleShortVersionString"] as? String ?? "Unknown"
        let appBuild = info[kCFBundleVersionKey as String] as? String ?? "Unknown"
        let osNameVersion: String = {
            let version = ProcessInfo.processInfo.operatingSystemVersion
            let versionString = "\(version.majorVersion).\(version.minorVersion).\(version.patchVersion)"
            let osName: String = {
                #if os(iOS)
                    return "iOS"
                #elseif os(watchOS)
                    return "watchOS"
                #elseif os(tvOS)
                    return "tvOS"
                #elseif os(macOS)
                    return "OS X"
                #elseif os(Linux)
                    return "Linux"
                #else
                    return "Unknown"
                #endif
            }()
            return "\(osName) \(versionString)"
        }()

        return "\(executable)/\(appVersion) (\(bundle); build:\(appBuild); \(osNameVersion)) "
    }
    return "MyApp"
}()

Output:

"User-Agent": "MyApp/4.6.0 (com.app.myapp; build:4.6.0.0; iOS 15.2.0) "