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delegate-bos-sekretaris's Introduction

Implementasi Delegates Programming pada Swift

Delegates adalah paradigma programming dengan penyerahan tugas kepada pihak lain. Dalam konteks pemrograman iOS baik menggunakan Swift ataupun Objective-C, pendelegasian disini adalah menyerahkan tugas dari objek tertentu ke objek yang lain

Studi Kasus

Pada kasus Bos yang terlalu sibuk sehingga mendelegasikan ke sekretaris untuk mengatur jadwal meeting. Dengan delegates Bos akan dibantu oleh Sekretaris dalam mengimplementasi kemampuan mengatur jadwal.

Langkah-langkah

  1. Membuat Abstraksi meeting (struct)
struct Meeting {
    var time: String = ""
    var agenda: String = ""
}
  1. Membuat tata cara/method bagaimana sekretaris bekerja
protocol SekretarisDelegates{
    func managedSchedule(_ meeting: Meeting)
}
  1. Impelementasi protocol pada kelas sekretaris
class Sekretaris: SekretarisDelegates{
    func managedSchedule(_ meeting: Meeting) {
        print("Meeting harian dengan agenda \(meeting.agenda) pada hari \(meeting.time)")
    }
}
  1. Kelas Bos dapat melakukan delegasi sehingga memiliki atribut delegates dan menentukan jadwal dan agenda meeting
class Bos {
    var meetingDelegates: SekretarisDelegates?
    func determineMeeting(){
        var meeting =  Meeting()
        meeting.agenda = "Pembahasan RUU"
        meeting.time = "Senin"
        meetingDelegates?.managedSchedule(meeting)
    }
}
  1. Instansiasi User menjadi Bos dan Sekretaris
let fauzi = Bos()
let haruna = Sekretaris()
  1. Fauzi menyuruh haruna untuk mengatur jadwal , dan fauzi bisa menentukan meeting atas bantuan haruna
fauzi.meetingDelegates = haruna
fauzi.determineMeeting()

fauzi dengan bantuan method protocol managedSchedule kini dapat mengatur jadwal meeting

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