Swift TabsController

AppDelegate.swift

import UIKit
import Material

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    
    var window: UIWindow?
    
    func applicationDidFinishLaunching(_ application: UIApplication) {
        window = UIWindow(frame: Screen.bounds)
        window!.rootViewController = AppTabsController(viewControllers: [BlueViewController(),
                                                                         BrownViewController(),
                                                                         GreenViewController()])
        window!.makeKeyAndVisible()
    }
}

AppTabsController.swift

import UIKit
import Material

class AppTabsController: TabsController {
  open override func prepare() {
    super.prepare()
    tabBar.setLineColor(Color.orange.base, for: .selected) // or tabBar.lineColor = Color.orange.base
    
    tabBar.setTabItemsColor(Color.grey.base, for: .normal)
    tabBar.setTabItemsColor(Color.purple.base, for: .selected)
    tabBar.setTabItemsColor(Color.green.base, for: .highlighted)
    
    tabBar.tabItems.first?.setTabItemColor(Color.blue.base, for: .selected)
    //    let color = tabBar.tabItems.first?.getTabItemColor(for: .selected)
    
    //    tabBarAlignment = .top
    //    tabBar.tabBarStyle = .auto
    //    tabBar.dividerColor = nil
    //    tabBar.lineHeight = 5.0
    //    tabBar.lineAlignment = .bottom
    //    tabBar.backgroundColor = Color.blue.darken2
  }
}

BlueViewController.swift

import UIKit
import Material

class BlueViewController: UIViewController {
  let v1 = UIView()
  
  open override func viewDidLoad() {
    super.viewDidLoad()
    view.backgroundColor = Color.blue.base
    
    prepareTabItem()
    
    v1.motionIdentifier = "v1"
    v1.backgroundColor = Color.red.base
    view.layout(v1).width(100).vertically().right()
  }
  
  override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    print("Blue viewWillAppear")
  }
  
  override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    print("Blue viewDidAppear")
  }
  
  override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    print("Blue viewWillDisappear")
  }
  
  override func viewDidDisappear(_ animated: Bool) {
    super.viewDidDisappear(animated)
    print("Blue viewDidDisappear")
  }
}

extension BlueViewController {
  fileprivate func prepareTabItem() {
    tabItem.title = "Blue"

//    tabItem.image = Icon.pen
    
    tabItem.setTabItemImage(Icon.add, for: .normal)
    tabItem.setTabItemImage(Icon.pen, for: .selected)
    tabItem.setTabItemImage(Icon.photoLibrary, for: .highlighted)
  }
}

BrownViewController.swift

import UIKit
import Material

class BrownViewController: UIViewController {
    let v1 = UIView()
    
    open override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = Color.brown.base
        
        prepareTabItem()
        
        v1.motionIdentifier = "v1"
        v1.backgroundColor = Color.red.base
        view.layout(v1).centerHorizontally().bottom().width(300).height(300)
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        print("Brown viewWillAppear")
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        print("Brown viewDidAppear")
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        print("Brown viewWillDisappear")
    }
    
    override func viewDidDisappear(_ animated: Bool) {
        super.viewDidDisappear(animated)
        print("Brown viewDidDisappear")
    }
}

extension BrownViewController {
    fileprivate func prepareTabItem() {
        tabItem.title = "Brown"
    }
}

GreenViewController.swift

import UIKit
import Material

class GreenViewController: UIViewController {
    let v1 = UIView()
    
    open override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = Color.green.base
        prepareTabItem()
        v1.motionIdentifier = "v1"
        v1.backgroundColor = Color.red.base
        view.layout(v1).bottom().horizontally().height(100)
    }
}

extension GreenViewController {
    fileprivate func prepareTabItem() {
        tabItem.title = "Green"
    }
}