How To check if there is a new version of my app in the App Store on Swift5?

Question

I am currently checking my app version. My apps are notified if there is a new version and should the App Store screen, press the OK. I am checking the app version to do it, but it always shows an error.

    func isUpdateAvailable(completion: @escaping (Bool?, Error?) -> Void) throws -> URLSessionDataTask {
        guard let info = Bundle.main.infoDictionary,
            let currentVersion = info["CFBundleShortVersionString"] as? String,
            let identifier = info["CFBundleIdentifier"] as? String,
            let url = URL(string: "http://itunes.apple.com/lookup?bundleId=\(identifier)") else {
                throw IXError.invalidBundleInfo
        }
        Log.Debug(currentVersion)
        let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
            do {
                if let error = error { throw error }
                guard let data = data else { throw IXError.invalidResponse }
                let json = try JSONSerialization.jsonObject(with: data, options: [.allowFragments]) as? [String: Any]
                guard let result = (json?["results"] as? [Any])?.first as? [String: Any], let version = result["version"] as? String else {
                    throw IXError.invalidResponse
                }
                completion(version != currentVersion, nil)
            } catch {
                completion(nil, error)
            }
        }
        task.resume()
        return task
    }

Usage

        _ = try? isUpdateAvailable { (update, error) in
            if let error = error {
                Log.Error(error)
            } else if let update = update {
                Log.Info(update)
            }
        }

Is this because my app doesn't have an app store?

1. If I have an app store, What response can I get to know if I have a version to update?
2. How can I go to the App Store?

Please help me a lot.

Answer 1

Yes, the method you use must be an already published app.

If you use an unpublished app, you will get results = []

Go to the App Store like this

let appId = "1454358806" // Replace with your appId
let appURL = URL.init(string: "itms-apps://itunes.apple.com/cn/app/id" + appId + "?mt=8") //Replace cn for your current country

UIApplication.shared.open(appURL!, options:[.universalLinksOnly : false]) { (success) in

}

Note:

This method will not be very timely, meaning that the application you just released, even if it can be searched in the App store , but results will not be updated immediately. Update information will be available after approximately 1 hour, or longer

Answer 2

I have done this via a completion handler

func appStoreVersion(callback: @escaping (Bool,String)->Void) {
    let bundleId = Bundle.main.infoDictionary!["CFBundleIdentifier"] as! String
    Alamofire.request("https://itunes.apple.com/lookup?bundleId=\(bundleId)").responseJSON { response in
      if let json = response.result.value as? NSDictionary, let results = json["results"] as? NSArray, let entry = results.firstObject as? NSDictionary, let appStoreVersion = entry["version"] as? String{
        callback(true,appStoreVersion)
      }else{
        callback(false, "-")
        }
    }
  }

appStoreVersion contains your app version on app store. Remember: When your app goes live on app store, it may take up to 24 hours until you see the latest version. Here is how to use it:

appStoreVersion { (success,version) in
            appVersion = version
            self.VersionLabel.text = "App version \(appVersion)"

        }

You can use the success version to do a different things it version cannot be retrieved. ie you are not connected or. You can check how it is used in this app(Settings Tab):https://apps.apple.com/us/app/group-expenses-light/id1285557503

Answer 3

I have used the completion handler too.

private func getAppInfo(completion: @escaping (AppInfo?, Error?) -> Void) -> URLSessionDataTask? {
    guard let identifier = Bundle.main.infoDictionary?["CFBundleIdentifier"] as? String,
        let url = URL(string: "http://itunes.apple.com/lookup?bundleId=\(identifier)") else {
            DispatchQueue.main.async {
                completion(nil, VersionError.invalidBundleInfo)
            }
            return nil
    }

private func getVersion() {
_ = getAppInfo { info, error in
                if let appStoreAppVersion = info?.version {
                    let new = appStoreAppVersion.components(separatedBy: ".")
                    if let error = error {
                        print("error getting app store version: \(error)")
                    } else {
                        print(new)
                    }
}