@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

  // You need to keep a reference to QAMenu, otherwise it will be released from memory
  var qaMenu: QAMenu?

  ...
  
  private func setupQAMenu() {
   let groups: [Group] = [
      QAMenu.Catalog.AppInfo.group(),
      self.cacheGroup,
      QAMenu.Catalog.Preferences.group()
    ]
    self.qaMenu = QAMenu(
      pane: RootPane(title: .static("Simple Project"), groups: groups),
      presenterType: QAMenuUIKitPresenter.self
    )
    self.qaMenu?.setTrigger([.shake], mode: .initialValue)
  }
  
  private var cacheGroup: [Group] {
    let group = ItemGroup(title: .static("App Cache"), items: .static([
      BoolItem(
        title: .static("Enable cache"),
        value: .computed({ [weak self] in
            return self?.simpleProjectCacheEnabled ?? false
        }),
        onValueChange: { [weak self] value, _, result in
            guard let self = self else {
              result(.failure("Object was released from memory"))
              return
            }
            self.simpleProjectCacheEnabled = value
            result(.success)
        }
      ),
      StringItem(
        title: .static("Cached images"),
        value: .computed({ [weak self] in
          return String(describing: self?.cache.imagesCount ?? 0)
        })
      ),
      ButtonItem(
        title: .static("Reset image cache"),
        action: { [weak self] (item: ButtonItem, _) in
          item.status = .progress("Deleting cache")
          DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
            self?.simpleProjectCachedImagesCount = 0
            item.status = .idle
            item.parentGroup?.invalidate()
          }
        }
      )
    ]))
    return group
  }
}