アプリ関連の文字列を1か所にまとめたSwift5用のAppInfoという構造体（struct）を用意する。

AppInfoの構造体（struct）

AppInfo.swift

struct AppInfo {
    var appName : String {
        return readFromInfoPlist(withKey: "CFBundleName") ?? "(unknown app name)"
    }

    var appDisplayName : String {
        return readFromInfoPlist(withKey: "CFBundleDisplayName") ?? "(unknown app displayname)"
    }

    var version : String {
        return readFromInfoPlist(withKey: "CFBundleShortVersionString") ?? "(unknown app version)"
    }

    var build : String {
        return readFromInfoPlist(withKey: "CFBundleVersion") ?? "(unknown build number)"
    }

    var minimumOSVersion : String {
        return readFromInfoPlist(withKey: "MinimumOSVersion") ?? "(unknown minimum OSVersion)"
    }

    var copyrightNotice : String {
        return readFromInfoPlist(withKey: "NSHumanReadableCopyright") ?? "(unknown copyright notice)"
    }

    var bundleIdentifier : String {
        return readFromInfoPlist(withKey: "CFBundleIdentifier") ?? "(unknown bundle identifier)"
    }

    // Info.plistへの参照をDictionaryとして保持
    private let infoPlistDictionary = Bundle.main.infoDictionary

    /// info.Plistから関連する値 (文字列型)を取得
    private func readFromInfoPlist(withKey key: String) -> String? {
        return infoPlistDictionary?[key] as? String
    }
}

こんな感じで使えます

        let appInfo = AppInfo()
        print(appInfo.appName)
        print(appInfo.appDisplayName)
        print(appInfo.version)

参考