// Subclass FeatureTags to get automatic feature registration
class Features: FeatureTags {
  let feature1 = makeFeature()
  let feature2 = makeFeature(key: "remote_feature1", enabled: true)
}

// Singleton instance for features 
let features = Features()

...
  if features.feature1.isOn {
      // Code to execute if feature is enabled
  } else {
      // Code to execute if feature is disabled
  }
...

...
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
  ...
  FeatureTags.Manager.install(name: 'local', priority: 10, resolver: FeatureTags.Resolvers.Local(namespace: 'featuretags'))
  ...
}

// Set a value if resolver supports it (ignored if setting is not supported)
FeatureTags.Manager.instance.set(features.feature1, to: true, in: 'local')

// Remove a value and allow an higher priority resolver to resolve a value
FeatureTags.Manager.instance.remove(features.feature1, from: 'local')

// Set a value if resolver supports it (ignored if setting is not supported)
FeatureTags.Manager.instance.set(features.feature1, to: true)

// Remove a value and allow an higher priority resolver to resolve a value
FeatureTags.Manager.instance.remove(features.feature1)

let allFeatures = FeatureTags.Manager.instance.allFeatures