Check if my IOS application is updated

Question

I need to check when my app launches if it was being updated, because i need to make a view that only appears when the app is firstly installed to appear again after being

Answer 1

Just initialise AppVersionUpdateNotifier in app launch and conform AppUpdateNotifier protocol, enjoy.

Use: Swift 3.x

extension AppDelegate: AppUpdateNotifier {
    func onVersionUpdate(newVersion: Int, oldVersion: Int) {
        // do something
    }
    
    func onFirstLaunch() {
        //do something
    }
}

    class AppVersionUpdateNotifier {
        static let KEY_APP_VERSION = "key_app_version"
        static let shared = AppVersionUpdateNotifier()
        
        private let userDefault:UserDefaults
        private var delegate:AppUpdateNotifier?
        
        private init() {
            self.userDefault = UserDefaults.standard
        }
        
        func initNotifier(_ delegate:AppUpdateNotifier) {
            self.delegate = delegate
            checkVersionAndNotify()
        }
        
        private func checkVersionAndNotify() {
            let versionOfLastRun = userDefault.object(forKey: AppVersionUpdateNotifier.KEY_APP_VERSION) as? Int
            let currentVersion = Int(Bundle.main.buildVersion)!
            
            if versionOfLastRun == nil {
                // First start after installing the app
                delegate?.onFirstLaunch()
            } else if versionOfLastRun != currentVersion {
                // App was updated since last run
                delegate?.onVersionUpdate(newVersion: currentVersion, oldVersion: versionOfLastRun!)
            } else {
                // nothing changed
                
            }
            userDefault.set(currentVersion, forKey: AppVersionUpdateNotifier.KEY_APP_VERSION)
        }
    }
    
    protocol AppUpdateNotifier {
        func onFirstLaunch()
        func onVersionUpdate(newVersion:Int, oldVersion:Int)
    }
    extension Bundle {
        var shortVersion: String {
            return infoDictionary!["CFBundleShortVersionString"] as! String
        }
        var buildVersion: String {
            return infoDictionary!["CFBundleVersion"] as! String
        }
    }