Alamofire singleton example

APIRequest.swift

//
//  APIRequest.swift
//
//  Created by 家齊 on 2016/12/27.
//  Copyright © 2016年 Archie Chang. All rights reserved.
//

import Alamofire

class APIRequest {
    static let shared = APIRequest()
    
    private let manager: Alamofire.SessionManager = {
        let configuration = URLSessionConfiguration.default
        configuration.timeoutIntervalForRequest = 10
        configuration.timeoutIntervalForResource = 10
        return Alamofire.SessionManager(configuration: configuration)
    }()
    
    func getYoutubeList(completHandler: @escaping ([YoutubeItem]) -> ()) {
        manager.request("").responseJSON(completionHandler: {
            response in
            guard let responseDictionary = response.result.value as? [String: AnyObject] else {
                return
            }
            var returnItems = [YoutubeItem]()
            if let items = responseDictionary["items"] as? [[String: AnyObject]] {
                for itemFromServer in items {
                    if let title = itemFromServer["title"] as? String,
                        let url = itemFromServer["url"] as? String {
                        returnItems.append(YoutubeItem(title: title, url: url))
                    }
                }
            }
            completHandler(returnItems)
        })
    }
}

struct YoutubeItem {
    var title: String
    var url: String
}