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

I've created BundleInfoVersioning swift package to help me solve this issue.

It works with all keys in the info dictionary, like CFBundleVersion or CFBundleShortVersionString and with custom key paths like, for example, NSAgora/DatabaseVersion.

Examples:

let bundleInfoVersioning = BundleInfoVersioning(bundle: .main)

bundleInfoVersioning.check(forKeyPath: "CFBundleVersion") { (old: String?, new: String?) in
    if old == nil {
        Analytics.install(version: new)
    }
    else {
        Analytics.update(from: old, to: new)
    }
}

bundleInfoVersioning.check(forKeyPath: "CFBundleShortVersionString") { _ , newVersion in
    self.showWhatsNew(in: newVersion)
}

bundleInfoVersioning.check(forKeyPath: "NSAgora/DatabaseVersion") { (old: Int?, new: Int?) in
    self.resetDataBase()
}

You can check it out on github at https://github.com/nsagora/bundle-info-versioning.

Answer 2

Here is a simple code to know if the current version is different (this code work on simulator too.)

-(BOOL) needsUpdate
{
    NSDictionary* infoDictionary = [[NSBundle mainBundle] infoDictionary];
    NSString* appID = infoDictionary[@"CFBundleIdentifier"];
    NSURL* url = [NSURL URLWithString:[NSString stringWithFormat:@"http://itunes.apple.com/lookup?bundleId=%@", appID]];
    NSData* data = [NSData dataWithContentsOfURL:url];
    NSDictionary* lookup = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];

   if ([lookup[@"resultCount"] integerValue] == 1)
   {
       NSString* appStoreVersion = lookup[@"results"][0][@"version"];
       NSString* currentVersion = infoDictionary[@"CFBundleShortVersionString"];
       if (![appStoreVersion isEqualToString:currentVersion])
       {
           NSLog(@"Need to update [%@ != %@]", appStoreVersion, currentVersion);
           return YES;
       }
    }
    return NO;
}

Note: Make sure that when you enter the new version in iTunes, this matches the version in the app you are releasing. If not then the above code will always return YES regardless if the user updates.

Answer 3

This worked for me..

func compareVersion(old:String,latest:String) -> Bool {
 if latest.compare(old, options: .numeric) == .orderedDescending {
     return true
 }
   return false
 }

compareVersion(old: "3.1.5", latest: "3.2")

Answer 4

you can store a app version number in NSUserDefaults and check it every time your app is launched. If the number is not available, its a fresh installation. If it is changed , it is an upgrade.

Answer 5

swift version with an important improvement over the accepted answer:

• using infoDictionary instead of objectForInfoDictionaryKey guaranties that the result is independent from device language, otherwise you may end up in some rare cases believing that there is an upgrade when in reality it is just a device language change
• using a UserDefaults key identical to the main Bundle infoDictionary for clarity on what is exactly stored
• factoring setting currentVersion code
• Swift 3 syntax

Code:

    let standardUserDefaults = UserDefaults.standard
    let shortVersionKey = "CFBundleShortVersionString"
    let currentVersion = Bundle.main.infoDictionary![shortVersionKey] as! String
    let previousVersion = standardUserDefaults.object(forKey: shortVersionKey) as? String
    if previousVersion == currentVersion {
        // same version
    } else {
        // replace with `if let previousVersion = previousVersion {` if you need the exact value
        if previousVersion != nil {
            // new version
        } else {
            // first launch
        }
        standardUserDefaults.set(currentVersion, forKey: shortVersionKey)
        standardUserDefaults.synchronize()
    }

Answer 6

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
        }
    }