Object-Oriented Programming: Beyond the Basics

Oct 17 2023 · Swift 5.9, iOS 17, Xcode 15

Lesson 04: Single Responsibility & Open-Closed Principles

Demo 2

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Open the starter playground. It’s identical to the code you had at the end of lesson three, “Design Patterns”.

public struct ContactOptions: OptionSet {
  public init(rawValue: Int) {
    self.rawValue = rawValue
  }
  public let rawValue: Int
}

static let unknown = ContactOptions(rawValue: 1 << 0) // binary = 0001
static let person = ContactOptions(rawValue: 1 << 1) // binary = 0010
static let company = ContactOptions(rawValue: 1 << 2) // binary = 0100
static let emergency = ContactOptions(rawValue: 1 << 3)// binary = 1000
static let publicPayPhone = ContactOptions(rawValue: 1 << 4) // binary = 10000

var canAdd: ContactOptions = []
var cardType: ContactOptions = .unknown

public final func addRelatedContact(_ contact: ContactCard) {

public final func addRelatedContact(_ contact: ContactCard) {
  if canAdd.contains(contact.cardType) {
    print("Adding contact to related list.")
    relatedContacts.append(contact.contactID)
  } else {
    print("Can't Add")
  }

  if contact.canAdd.contains(cardType) {
    print("Adding inverse relation")
    contact.relatedContacts.append(self.contactID)
  } else {
    print("Can't Add Inverse")
  }
  broadcastUpdates()
}

public override init(firstName: String, lastName: String, phoneNumber: String) {
  super.init(firstName: firstName, lastName: lastName, phoneNumber: phoneNumber)
  canAdd = [.person] // new code
  cardType = .person // new code
}

override init(firstName: String, lastName: String, phoneNumber: String) {
  super.init(firstName: firstName, lastName: lastName, phoneNumber: phoneNumber)
  canAdd = [.person, .company] // new code
  cardType = .company // new code
}
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