Migrating from SVProgressHUD to MBProgressHUD. We needed to expose `hasFinished` from MBProgressHUD's implementation and have added tests to make sure we remember about it when we upgrade MBProgressHUD. We didn't use Swift's default values and instead have added multiple `showStatus...` because we need to use it from Objective-C.

MBProgressHUD+Additions.h

//
//  MBProgressHUD+Additions.h
//  Caremobile
//
//  Created by Victor Ilyukevich on 4/13/16.
//  Copyright © 2016 Care Zone Inc. All rights reserved.
//

@interface MBProgressHUD (Additions)
- (BOOL)hasFinished;
@end

MBProgressHUD+Additions.swift

//
//  MBProgressHUD+Additions.swift
//  Caremobile
//
//  Created by Victor Ilyukevich on 4/11/16.
//  Copyright © 2016 Care Zone Inc. All rights reserved.
//

import Foundation
import BlocksKit

extension MBProgressHUD {

  static func isVisible() -> Bool {
    if let _ = MBProgressHUD(forView: firstWindow) {
      return true
    }
    return false
  }

  static func show() -> MBProgressHUD {
    return showStatus(nil)
  }

  static func showStatus(text: String?) -> MBProgressHUD {
    return showStatus(text, dimBackground: false, cancelBlock: nil)
  }

  static func showStatus(text: String?, cancelBlock: (UIButton -> ())?) -> MBProgressHUD {
    return showStatus(text, dimBackground: false, cancelBlock: cancelBlock)
  }

  static func showStatus(text: String?, dimBackground: Bool) -> MBProgressHUD {
    return showStatus(text, dimBackground: dimBackground, cancelBlock: nil)
  }

  static func showStatus(text: String?, dimBackground: Bool, cancelBlock: (UIButton -> ())?) -> MBProgressHUD {
    let hud = findOrCreateHUD()
    hud.mode = .Indeterminate
    hud.label.text = text
    hud.userInteractionEnabled = true
    if dimBackground {
      hud.backgroundView.color = UIColor(white: 0, alpha: 0.5)
    }
    if let handler = cancelBlock {
      hud.button.setTitle(t("Cancel"), forState: .Normal)
      hud.button.bk_addEventHandler({ sender in
        MBProgressHUD.dismiss()
        handler(sender as! UIButton)
      }, forControlEvents: .TouchUpInside)
    }

    return hud
  }

  static func showSuccessAndDismiss(text: String?) -> MBProgressHUD {
    return showAwesomeIconAndDismiss("\u{f00c}", text: text)
  }

  static func showErrorAndDismiss(text: String?) -> MBProgressHUD {
    return showAwesomeIconAndDismiss("\u{f057}", text: text)
  }

  static func dismiss() {
    hideHUDForView(firstWindow, animated: true)
  }

  static func setProgress(progress: Float) {
    if let hud = MBProgressHUD(forView: firstWindow) {
      hud.progress = progress
    }
  }

  // MARK: Internal

  private static func findOrCreateHUD() -> MBProgressHUD {
    if let hud = MBProgressHUD(forView: firstWindow) where hud.hasFinished() == false {
      hud.showAnimated(true) // cancel pending timer to hide, if any
      return hud
    }
    return showHUDAddedTo(firstWindow, animated: true)
  }

  private static var firstWindow: UIView {
    // There is also `UIApplication#keyWindow` but it might be wrong window.
    // For example if and alert is presented, then `keyWindow` will have a reference to it.
    return UIApplication.sharedApplication().windows.first!
  }

  private static func showAwesomeIconAndDismiss(icon: String, text: String?) -> MBProgressHUD {
    let hud = findOrCreateHUD()
    hud.label.text = text
    hud.hideButton()
    hud.customView = makeAwesomeLabel(icon)
    hud.mode = .CustomView
    hud.userInteractionEnabled = false
    hud.hideAnimated(true, afterDelay: 1)
    return hud
  }

  private func hideButton() {
    button.removeTarget(nil, action: nil, forControlEvents: .AllEvents)
    button.setTitle(nil, forState: .Normal)
    setNeedsUpdateConstraints()
  }
}

private func makeAwesomeLabel(text: String) -> UILabel {
  let view = UILabel()
  view.font = UIFont(name: "FontAwesome", size: 30)
  view.text = text
  return view
}

MBProgressHUDAdditionsSpec.m

//
//  MBProgressHUDAdditionsSpec.m
//  Caremobile
//
//  Created by Victor Ilyukevich on 4/13/16.
//  Copyright 2016 Care Zone Inc. All rights reserved.
//

@import Kiwi;

#import "MBProgressHUD+Additions.h"

SPEC_BEGIN(MBProgressHUDAdditionsSpec)

describe(@"MBProgressHUD+Additions", ^{

  __block MBProgressHUD *hud;

  beforeEach(^{
    hud = [MBProgressHUD showHUDAddedTo:[UIView new] animated:NO];
  });

  it(@"responds to `hasFinished`", ^{
    [[hud should] respondToSelector:@selector(hasFinished)];
  });

  it(@"is finished after hide call", ^{
    [[theValue(hud.hasFinished) should] beFalse];
    [hud hideAnimated:NO];
    [[theValue(hud.hasFinished) should] beTrue];
  });

});

SPEC_END