iOS DoggyPresenter.swift


Example

import Foundation

class DoggyPresenter {

    // MARK: - Private
    fileprivate let dogService: DoggyService
    weak fileprivate var dogView: DoggyView?

    init(dogService: DoggyService){
        self.dogService = dogService
    }

    func attachView(_ attach: Bool, view: DoggyView?) {
        if attach {
            dogView = nil
        } else {
            if let view = view { dogView = view }
        }
    }

    func getDogs(){
        self.dogView?.startLoading()
    
        dogService.deliverDoggies { [weak self] doggies in
            self?.dogView?.finishLoading()
        
        if doggies.count == 0 {
            self?.dogView?.setEmpty()
        } else {
            self?.dogView?.setDoggies(doggies.map {
                return DoggyViewData(name: "\($0.name) \($0.breed)",
                                      age: "\($0.age)")
                })
            }
        }
    }
}

struct DoggyViewData {
    let name: String
    let age:  String
}