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Swift adapter design sample – The.Swift.Dev.

Flip an incompatible object right into a goal interface or class by utilizing an actual world instance and the adapter design sample in Swift.

Design patterns

Fist of all let me emphasize that, that is the true world illustration of what we will construct on this little Swift adapter sample tutorial:

Adapter is a structural design sample that enables objects with incompatible interfaces to work collectively. In different phrases, it transforms the interface of an object to adapt it to a unique object.

So adapter can rework one factor into one other, generally it is known as wrapper, as a result of it wraps the thing and offers a brand new interface round it. It is like a software program dongle for particular interfaces or legacy lessons. (Dongle haters: it is time to go away the previous behind!) šŸ˜‚

Adapter design sample implementation

Creating an adapter in Swift is definitely an excellent straightforward job to do. You simply must make a brand new object, “field” the previous one into it and implement the required interface in your new class or struct. In different phrases, a wrapper object can be our adapter to implement the goal interface by wrapping an different adaptee object. So once more:


The article we’re adapting to a selected goal (eg. old-school USB-A port).


An object that wraps the unique one and produces the brand new necessities specified by some goal interface (this does the precise work, aka. the little dongle above).


It’s the object we need to use adaptee with (our USB-C socket).

The way to use the adapter sample in Swift?

You should utilize an adapter if you wish to combine a third-party library in your code, however it’s interface does not match along with your necessities. For instance you’ll be able to create a wrapper round a whole SDK or backend API endpoints with a view to create a standard denominator. šŸ‘½

In my instance, I’ll wrap an EKEvent object with an adapter class to implement a model new protocol. šŸ“†

import Basis
import EventKit

protocol Occasion {
    var title: String { get }
    var startDate: String { get }
    var endDate: String { get }

class EventAdapter {

    non-public lazy var dateFormatter: DateFormatter = {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy. MM. dd. HH:mm"
        return dateFormatter

    non-public var occasion: EKEvent

    init(occasion: EKEvent) {
        self.occasion = occasion

extension EventAdapter: Occasion {

    var title: String {
        return self.occasion.title
    var startDate: String {
        return self.dateFormatter.string(from: occasion.startDate)
    var endDate: String {
        return self.dateFormatter.string(from: occasion.endDate)

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "MM/dd/yyyy HH:mm"

let calendarEvent = EKEvent(eventStore: EKEventStore())
calendarEvent.title = "Adapter tutorial deadline"
calendarEvent.startDate = "07/30/2018 10:00")
calendarEvent.endDate = "07/30/2018 11:00")

let adapter = EventAdapter(occasion: calendarEvent)

One other use case is when you need to use a number of present last lessons or structs however they lack some performance and also you need to construct a brand new goal interface on prime of them. Generally it is a good selection to implement an wrapper to deal with this messy state of affairs. šŸ¤·ā€ā™‚ļø

That is all concerning the adapter design sample. Normally it is very easy to implement it in Swift – or in some other programming language – however it’s tremendous helpful and generally unavoidable. Children, keep in mind: do not go too arduous on dongles! šŸ˜‰ #himym



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