How to release app to testflight?

Ans :

Q. What is TestFlight?
A. TestFlight is a platform provided by Apple that allows you to send a testable version of your app to specific beta users. It’s important to realise this is different than the App Store (which is available to the general public). Once you send a user a TestFlight invitation, they must download the TestFlight app where they can download and use a specific version of your app for 60 days.

App resource and deployment to TestFlight :

Apple’s Developer Portal. Here you create a distinct IDs for an App, get your certificates and much more.
iTunes Connect is where you manage your app, its details, screenshots, and who all has access to the different types of the app info (like Revenue, and User stats).

1. Register bundle identifier i.e com.benefit.me on developer.apple.com site. Add capabilities if any.
2. Develop, Download and Install required certificates (ad hoc distribution for TestFlight). 
3. In iTunes Connect, register your app with required fields.
4. Goto TestFlight tab, there is no any builds right now.
5. Now goto  Xcode and Select generic device and then goto  Product > Archive and Choose valid distribution certificate and upload to App Store. It will only uploaded to iTunes Connect portal.

If you go back to the TestFlight tab and click on the iOS TestFlight Builds sidebar item you will now see that your archive is being processed by iTunes Connect. This should take ~15 mins and you will receive an email when done.

Now that our build is on iTunes Connect we need to set up Internal and/or External TestFlight Testing.

After processing, select version no to send to tester, fill required information about what to test, what types of testers or group app has to be sent for testing. After submit, after  sometime, tester will get email or may get notification about new build with version is ready to test.

BuddyBuild or Hockey App are for alternatives to TestFlight.

Source : Quick Guide - Daniel Mathews

How you show current location blue dot on map?

Ans :

self.mapView.myLocationEnabled = YES to hide the blue dot.
set a class to implement CLLocationManagerDelegate to track user's location.

https://stackoverflow.com/a/40058423

What is subscript?

Ans : 

Subscripts are used to access information from a collection, sequence and a list in Classes, Structures and Enumerations without using a method.

These subscripts are used to store and retrieve the values with the help of index without the use of separate method.

To access elements via subscripts write one or more values between square brackets after the instance name.

For example: Array elements are accessed with the help of someArray[index] and its subsequent member elements in a Dictionary instance can be accessed as someDicitonary[key].

Code :

In coding, subscript is same as computed property.

 class monthsInYear {

 private var months = [“Jan”, “Feb”, “Mar”, “Apr”, “May”, “Jun”, “Jul”, "Aug",  "Sep" , "Oct", "Nov" , "Dec"] 

 subscript(index: Int) -> String {

 get {

       return months[index] // getter is mandatory

  }

 set(newValue) {

       self.months[index] = newValue // setter is optional

     }

   }

 }

 var p = monthsInYear()

 print(p[0]) // prints Jan

 p[0] = “Jan”

 print(p[0]) // prints Jan

If you have any comment, question, or recommendation, feel free to post them in the comment section below!

What is Object mapping that helping Jon parsing?

Ans. : Object mapping is convert to JSON to SomeOtherObject, BussinessModel to PersistenceModel, etc or map fields of JSON to SomeOtherObject fields.

There are many third party library available for same purpose.

1. We use mapping using init method without third party library :

struct User {

  let id: Int

  let name: String

  

  init?(dictionary: [String: Any]) {

    guard let id = dictionary["id"] as? Int else { return nil }

    guard let name = dictionary["user_name"] as? String else { return nil }

    

    self.id = id

    self.name = name

  }

}

do {

  if let userDictionary = try JSONSerialization.jsonObject(with: jsonData, options: []) as? [String: Any] {

    let user = User(dictionary: userDictionary)

    //Do something with user

  }

} catch {

  print(error)

}

2. Lyft’s Mapper Library

3. Using codable protocol  (Without third party)

4. SwiftyJson 

In today's world mostly people using 3rd option for  object mapping.

Different task available in NSURLSession

Ans : 

NSURLSession   :       The NSURLSession class and related classes provide an API for downloading data from and uploading data to endpoints indicated by URLs. Your app can also use this API to perform background downloads when your app isn’t running or, in iOS, while your app is suspended.
It is replacement of NSURLConnection from iOS 7.

Types of URL Sessions :

1. default sessions: behaviour like NSURLConnection 
2. ephemeral sessions: not cache any content to disk 
3. download sessions: store the result in file and transferring data even when app is suspended, exits or crashes

Based on above sessions, developers can schedule three types of tasks: 

1. data tasks: retrieve data to memory 
2. download tasks: download file to disk 
3. upload tasks: uploading file from disk and receiving response as data in memory 

func httpGet(request: NSURLRequest!, callback: (String, String?) -> Void) {

            var session = NSURLSession.sharedSession()

            var task = session.dataTaskWithRequest(request){

                 (data, response, error) -> Void in

                 if error != nil {

                     callback(“”, error.localizedDescription)

                 } else {

                     var result = NSString(data: data, encoding:

                                           NSASCIIStringEncoding)!

                     callback(result, nil)

                 }

            }

            task.resume()

        }