PostViewController.swift

class PostViewController {
  private let loader: Loader
  
  init(loader: Loader){
    self.loader = loader
  }
  
  func loadFeed(){
    loader.load()
  }
  
}
var viewController: PostViewController?
Reachability.isWifi {
  let wifiLoader = WifiLoader(url: URL(string: http://api.com/wifi/posts)!)
  viewController = PostViewController(loader: wifiLoader)
} else if Reachability.isCelluar {
  let cellularLoader = CellularLoader(url: URL(string: http://api.com/wifi/cellular)!)
  viewController = PostViewController(loader: cellularLoader)
} else if Reachability.isOffline {
  let localLoader = LocalLoader()
  viewController = PostViewController(loader: localLoader)
}