获取APP版本号

var appVersion: String {
    var result = ""
    if let info = Bundle.main.infoDictionary {
        if let version = info["CFBundleShortVersionString"] as? String {
            result = version
            if let build = info["CFBundleVersion"] as? String {
                result = "V" + version + " (Build " + build + ")"
            }
        } else {
            result = "V1.0.0 (Build 1)"
        }
    }
    return result
}