ios添加第一次安装引导页判断（swift）

        //获取版本信息并存储，如果第一次安装显示引导页
        let bundleVersionKey = kCFBundleVersionKey as String
        let bundleVersion = Bundle.main.infoDictionary?[bundleVersionKey] as? String
        let saveVersion =  UserDefaults.standard.string(forKey: bundleVersionKey)
        if bundleVersion == saveVersion {
            welcomeView.isHidden  = true
        } else {
            UserDefaults.standard.set(bundleVersion, forKey: bundleVersionKey)
        }