completionhandler

I am trying to use asynchronousFileChannel to write the date into a text file. I made 3 jar file of the program with the AsynchronousFileChannel and compiled all 3 jars simultaneously through command prompt to read 3 different text files and output to one common temporary file I have 2000 records in my test files(3) to be read,but the output in the common temporary file is missing some of the records,the output should have 6000 records but it shows only 5366 or 5666 or sometimes less than that. I am not able to figure out why some data is lost as it is the functionality of a

I am trying to check if UserNotifications are enabled and if not I want to throw an alert. So I have a function checkAvailability which checks multiple things, including the UserNotification authorization status. func checkAvailabilty() -> Bool { // // other checking // var isNotificationsEnabled = false UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound], completionHandler: { (granted, error) in if granted { isNotificationsEnabled = true } else { isNotificationsEnabled = false } }) } if isNotificationsEnabled { return true } else { // Throw alert: Remind user to

I am trying to write a function that will execute an asynchronous GET request, and return the response (as any data type, but here it is as NSData). This question is based on: How to use NSURLConnection completionHandler with swift func getAsynchData() -> NSData { var dataOutput : NSData let url:NSURL = NSURL(string:"some url") let request:NSURLRequest = NSURLRequest(URL:url) let queue:NSOperationQueue = NSOperationQueue() NSURLConnection.sendAsynchronousRequest(request, queue: queue, completionHandler:{ (response: NSURLResponse!, data: NSData!, error: NSError!) -> Void in /* this next line

I am making a call to HERE Weather API from a mobile App and need to return the current weather as an object so that other methods can use that information for a given time period (eg. 30 min update intervals). I have a rough understanding of asynchronous calls based on this site https://fluffy.es/return-value-from-a-closure/ but I am still running into my problem where I can't access the Weather object I create outside of the closure of the completionHandler. I have provided the Get method from my Weather class. I have also provided a call to that Get method in the AppDelegates file. public

In a model's class Location , I get the name of the current city: var currentLatitude: Double! var currentLongitude: Double! var currentLocation: String! var currentCity: String! func getLocationName() { let geoCoder = CLGeocoder() let location = CLLocation(latitude: currentLatitude, longitude: currentLongitude) geoCoder.reverseGeocodeLocation(location, completionHandler: { placemarks, error in guard let addressDict = placemarks?[0].addressDictionary else { return } if let city = addressDict["City"] as? String { self.currentCity = city print(city) } if let zip = addressDict["ZIP"] as? String {

Currently what I have is this: AppDelegate.applicationDidBecomeActive(): func applicationDidBecomeActive(_ application: UIApplication) { // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface. guard let vc = self.window?.rootViewController?.children.first as! AlarmTableViewController? else { fatalError("Could not downcast rootViewController to type AlarmTableViewController, exiting") } vc.deleteOldAlarms(completionHandler: { () -> Void in vc.tableView.reloadData()