KaneCheshire

func logIn() {
  // Your code to log in
}

enum Tab {
  case profile
  case settings
}

func selectTabBar(tab: Tab) {

KaneCheshire

step("I log in") {
  // Your code to log in
}

step("I select the (profile|settings) tab") { (tabType: String) in
  switch tabType {
    case "profile": // Your code to select the profile tab
    case "settings": // Your code to select the settings tab
    default: XCTFail()
  }

KaneCheshire

func test_navigatingToSettings() {
  Given("I log in")
  When("I select the settings tab")
  Then("I see the settings screen")
}

KaneCheshire

Given(I: logIn)
When(I: {
  selectTabBar(tab: .settings)
})
Then(I: seeSettingsScreen)

KaneCheshire

struct Step {
  
  @discardableResult
  init(I handler: () -> Void) {
    handler()
  }
  
  @discardableResult
  init(I handler: @autoclosure () -> Void) {
    handler()

KaneCheshire

func test_navigatingToSettings() {
  Given(I: logIn)
  When(I: selectTabBar(tab: .settings))
  Then(I: seeSettingsScreen)
}

KaneCheshire

class Cell: UITableViewCell {
	
	override func awakeFromNib() {
		super.awakeFromNib()
		let settings = Settings() // This is me being sneaky, you really need to get this from a Realm
		accessoryView = SettingsSwitch(object: settings, keyPath: \Settings.prefersFahrenheit)
	}
	
}

KaneCheshire

let settingsSwitch = SettingsSwitch(object: settings, keyPath: \Settings.prefersFahrenheit)

KaneCheshire

class SettingsSwitch<T>: UISwitch {
	
	typealias BoolWritableKeyPath = WritableKeyPath<T, Bool>
	
	private var object: T // This is the object we'll update when the value changes
	private let keyPath: BoolWritableKeyPath // This is the key path we'll use to update the object
	
	init(object: T, keyPath: BoolWritableKeyPath) {
		self.object = object
		self.keyPath = keyPath

KaneCheshire

import RealmSwift

class Settings: Object {
	
	@objc private dynamic var _prefersFahrenheit: Bool = false // Realm requires all properties have a default value
	
	var prefersFahrenheit: Bool { // I find it's best to define explicit getters and setters since you can transform primitives into enums etc.
		get {
			return _prefersFahrenheit
		}