Force Update iOS App while API has major update

ForceUpdateAppVersion.swift

import Foundation

enum VersionError: Error {
    case invalidResponse, invalidBundleInfo
}

class ForceUpdateAppVersion {
    class func isForceUpdateRequire(apiVersion:Int) -> Bool {
        
        func update() {
            UserDefaults.standard.set(apiVersion, forKey: "ApiVersion")
        }
        
        func appUpdateAvailable() -> Bool
        {
            guard let info = Bundle.main.infoDictionary,
                let identifier = info["CFBundleIdentifier"] as? String else {
                    return false
            }
            
            let storeInfoURL: String = "http://itunes.apple.com/lookup?bundleId=\(identifier)&country=za"
            var upgradeAvailable = false
            // Get the main bundle of the app so that we can determine the app's version number
            let bundle = Bundle.main
            if let infoDictionary = bundle.infoDictionary {
                // The URL for this app on the iTunes store uses the Apple ID for the  This never changes, so it is a constant
                let urlOnAppStore = NSURL(string: storeInfoURL)
                if let dataInJSON = NSData(contentsOf: urlOnAppStore! as URL) {
                    // Try to deserialize the JSON that we got
                    if let dict: NSDictionary = try? JSONSerialization.jsonObject(with: dataInJSON as Data, options: JSONSerialization.ReadingOptions.allowFragments) as! [String: AnyObject] as NSDictionary? {
                        if let results:NSArray = dict["results"] as? NSArray {
                            if let version = (results[0] as! [String:Any])["version"] as? String {
                                // Get the version number of the current version installed on device
                                if let currentVersion = infoDictionary["CFBundleShortVersionString"] as? String {
                                    // Check if they are the same. If not, an upgrade is available.
                                    print("\(version)")
                                    if version != currentVersion {
                                        upgradeAvailable = true
                                    }
                                }
                            }
                        }
                    }
                }
            }
            return upgradeAvailable
        }

        let isUpdateRequireed = appUpdateAvailable()
        print(isUpdateRequireed)

        
        
        let apiVersionLocal = UserDefaults.standard.integer(forKey: "ApiVersion")
        guard apiVersionLocal != 0 else {
            update()
            return false
        }
        
        if isUpdateRequireed && (apiVersionLocal != apiVersion) {
            return true
        } else {
            update()
            return false
        }
    }
    


}

extension Bundle {
    var releaseVersionNumber: String? {
        return infoDictionary?["CFBundleShortVersionString"] as? String
    }
    var buildVersionNumber: String? {
        return infoDictionary?["CFBundleVersion"] as? String
    }
}

this was very helpful! thank you!

Nice work on this, kind of serves my purpose. One question though, infact I'm kinda skeptical to use this as my goto solution for my simple use-case(just to check version mismatch and present users with alert in that case), since I have heard a lot of App Rejections for using Itunes search api for content scraping, could not find the exact thread that suggest the case, but would like to have your inputs on this. Kindly help. Thanks again!

Does this work if the app is in review??