Programming in Swift: Functions & Types

Jan 4 2022 · Swift 5.5, iOS 15, Xcode 13

Part 5: Protocols & Inheritance

40. Initializers

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Previous episode: 39. Challenge: Inheritance Next episode: 41. Challenge: Initializers

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Notes: 40. Initializers

Update Notes: This course was originally recorded in 2019. It has been reviewed and all content and materials updated as of October 2021.

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You’ve already learned how to write basic initializers. You use them to set any values needed by your types at initialization time! But when inheritance is in the mix, you’ll need to incorporate a few more rules when writing your initializers.

47 var sports: [String]

49 init(firstName: String, lastName: String, sports: [String]) {

}

50 self.sports = sports

51 super.init(firstName: firstName, lastName: lastName)

  StudentAthlete(...... sports: ["Foosball"])

StudentAthlete(firstName: "Bernie", lastName: "Kosar")

49 … sports: [String] = []) {

49 … sports: [String]) {

54 override init(firstName: String, lastName: String) {

}

55 self.sports = sports
   super.init(firstName: firstName, lastName: lastName)

55 … = []

36 required init…

54 required init…

49 //  init(firstName: String, lastName: String, sports: [String]) {
//    self.sports = sports
//    super.init(firstName: firstName, lastName: lastName)
//  }
  
  required init(firstName: String, lastName: String, sports: [String] = []) {


49 init(firstName: String, lastName: String, sports: [String]) {
    self.sports = sports
    super.init(firstName: firstName, lastName: lastName)
  }
  
  required init(firstName: String, lastName: String) {

57 self.init(firstName: <#T##String#>, lastName: <#T##String#>, sports: <#T##[String]#>)

57 self.init(firstName: firstName, lastName: lastName, sports: [])

54 required init(firstName: String, lastName: String) {
    self.init(firstName: firstName, lastName: lastName, sports: [])
  }

54 required convenience init(firstName: String, lastName: String) {

45 convenience init(transfer: Student) {

}

46 self.init(firstName: transfer.firstName, lastName: transfer.lastName)

47 grades = transfer.grades

36 let rudy = StudentAthlete(firstName: "Daniel"…
…
39 StudentAthlete(transfer: rudy)

39 …rudy).sports

65  convenience init(transfer: StudentAthlete) {
    
  }

self.init(firstName: transfer.firstName, lastName: transfer.lastName, sports: transfer.sports)

grades = transfer.grades