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 Add Two Number With Simple Delegate - Swift delegate protocol is with simple examples to understand the delegate pattern using protocols in swift.                  import UIKit         import PlaygroundSupport                   PlaygroundPage. current .needsIndefiniteExecution = true         class Developer {             var manager : Manager?             func developerWillAddTwoNumbers ( a : Int , b : Int ){                 let result = a + b                 manager ?.addTwoNumber(result: result)             }         }         class Manager {             var developer : Developer?      ...

Protocols in swift are the best way to make your swift code        import UIKit     import Foundation     protocol ElectricityEquipment {         var voltage : Int ? { get set }         func start ()         func stop ()     }     protocol WaterElectricityEquipment {         var voltage : Int ? { get set }         var waterLevel : Int ? { get set }         func start ()         func stop ()     }     class Microwave : ElectricityEquipment {         var voltage : Int ?                  init ?( _voltage : Int ){             guard 50 ... 100 ~= _voltage else {                 print ( "Required valtage is not in the rang...

Dependency Injection  Dependency injection in swift is a design pattern achieved by designing your code in a way that your objects or functions receive objects that they depend on, instead of creating their own and avoid loosely coupled  We are going to explore Example such as  1. Constructor injection  2. Property injection  These two are the types of dependency injection that are used most of the time in swift programming language and if you use them during ios development your code program will have no hidden dependency. This swift Example has easy to understand dependency injection concept.  This Example Class Event has Hidden Dependency of HttpClient Create in function object internal. Only getEventRecord function have know Dependency HttpClient.  let client: HttpClient  = HttpClient() is a hidden Dependency                  import  Foundation          import...