Property in Swift - Computed property | Property Observers (WillSet & DidSet)

   Computed property -  Computed properties are part of a property type in Swift.  Stored properties are the most common which save and return a stored value  Computed properties calculate (rather than store) a value. A computed property provides a getter and an optional setter to indirectly access other properties and values. Computed property in swift is an interesting topic as you can write code inside a property in swift. Computed properties are provided by classes, structures, and enumerations but stored properties are provided only by classes and structures. This computed property swift tutorial has some tips on how to use the computed property in the right way and avoid the common mistakes that swift programming beginners do while computed property. Example :- Computed property A Calculate Simple Intrest struct CalculateLoan {      var amount : Int      var rate : Int      var years : Int      var simpleInterest: Int {          get {              return ( amount * rate
0

One Line JSON Parsing Swift 4 Simple Example


 One Line Parsing JSON in Swift 4.0 With Codable or Decodle

  Swift 4 includes a new way to generate and parse JSON with Swift Codable protocol.
 JSON:-
{
"name" = Rahul'
"id" = 10
"collage" = RTS Collage
"code" = A190
}
 Start:-
 import UIKit
struct  Profile: Codable {
let name: String
let id: Int
let  collage: String
let code: String

  Convert Item(Profile) to JSON
 init?(json: [String: Any]){
 guard let name = json["name" ] as?  String,
           let id= json["id" ] as?  Int,
           let collage= json["collage"  ]as?  String,
           let code= json["code" ] as?  String, else { return nil}
 self.name = name
self.id = id
self.collage = collage
self.code = code
}
}
class ViewController: UIViewController {
  guard let url = URL(string: "https://xxxxxxxxxx") else {return}
  URLSession.shared.dataTask(with: url) { (data, response  , error) in   
   guard let data = data else {return}
    do{
           let decoder = try JSONDecoder().decoder(Profile.self, from: data)
 // check access data......
         print(decoder.name)         
     } catch let err{
        print("Err", err)
     }
   }.resume()
}

Comments

Post a Comment