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  // MARK: Form Validation
  @discardableResult
  func isValid() -> (Bool, String?) {
    
    var isValid = true
    for item in self.formItems {
      item.checkValidity()
      if !item.isValid {
        isValid = false
      }

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// MARK: - Reloadable
extension HomeViewController: Reloadable {
  
  var hasData: Bool {
    //return if you have data to be currently displayed (from Realm or memory for instance) or not
  }
  
  func reloadData() {
    // Display progress
    // Network call

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import UIKit

protocol Reloadable {
  
  func reloadData()
  var hasData: Bool { get }
}

extension Reloadable where Self: UIViewController {
  

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/// Errors prompting protocol
protocol Failable {

  /// Show an error
  func showError(_ error: Swift.Error?)
}

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/// Errors prompting protocol at its core
protocol FailableCore {

  /// Show an error
  func showError(_ error: Swift.Error?)
}

/// Failable protocol to display error
protocol Failable: FailableCore {
  var errorScreenType: ErrorScreen? {get}

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/// Specify the error display context when hasData is true : use the error message, or use data oriented priority
///
/// - dataOriented: For this type, the error message will show that data inconsistency is possible
/// - errorOriented: The error message always use the Error type localized message if available, default message if needed
enum ErrorContext {
  case dataOriented
  case errorOriented

}

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// Type of screen and its error view to display
enum ErrorScreen {
  case home
  case details

  var errorView: ErrorView.Type? {
    switch self {
    default:
      return ErrorViewRetry.self
    }

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protocol ErrorDisplayable {
  static func show<T: ErrorView>(
    fromViewController viewController: UIViewController,
    animated: Bool,
    completion: ((Bool) -> Swift.Void)?) -> T

  static func show<T: ErrorView>(
    fromView view: UIView,
    insets: UIEdgeInsets, animated: Bool,
    completion: ((Bool) -> Swift.Void)?) -> T

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protocol ErrorViewDelegate: class {
  func errorView(_ errorView: ErrorView, didRetry sender: UIButton)
}

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protocol ErrorAnimatable {
  func playAnimation()
  func stopAnimation()
}