Stickerbox

private fun Fragment.getNavigationController(parent: Fragment? = null) : NavigationController? {
    if (parentFragment == null) return null
    if (parent == null) return getNavigationController(parentFragment)
    if (parentFragment!! is NavigationController) {
        return parentFragment as NavigationController
    }
    return getNavigationController(parentFragment)
}

val Fragment.navigationController : NavigationController? by lazy {

Stickerbox

<?xml version="1.0" encoding="utf-8"?>
<com.stickerbox.tabbarcontroller.NavigationView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/navigation_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

Stickerbox

class NavigationController : Fragment() {

    private lateinit var navigationView: NavigationView
    lateinit var rootFragment: Fragment

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        return inflater.inflate(R.layout.fragment_navigation_controller, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {

Stickerbox

class NavigationView @JvmOverloads constructor(context: Context,
                                               attrs: AttributeSet? = null) : FrameLayout(context, attrs) {

    private enum class Operation {
        FORWARD, BACKWARD, ROOT
    }

    lateinit var rootFragment: Fragment
    var fragmentManager: FragmentManager? = null

Stickerbox

class TabBarController : AppCompatActivity() {

    private val adapter by lazy { TabAdapter(supportFragmentManager) }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_tab_bar_controller)

        tab_bar_container.adapter = adapter
        tab_bar_container.offscreenPageLimit = adapter.count

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class FixedViewPager @JvmOverloads constructor(context: Context,
                                               attrs: AttributeSet? = null) : ViewPager(context, attrs) {

    override fun onTouchEvent(ev: MotionEvent?) = false
    override fun onInterceptTouchEvent(ev: MotionEvent?) = false
}

Stickerbox

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.design.widget.BottomNavigationView
        android:id="@+id/tab_bar"
        android:layout_width="match_parent"

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import UIKit

enum Storyboard: String {
    case main
  
    var value: String {
        return self.rawValue.capitalized
    }
}

Stickerbox

import UIKit

@IBDesignable
class UnderlinedTextField: UITextField {

    @IBInspectable var borderColor: UIColor = Colors.darkText {
        didSet { setNeedsDisplay() }
    }

    @IBInspectable var borderedWidth: CGFloat = 1 {

Stickerbox

class RepeatingCircle: UIView {

    let replicatorLayer = CAReplicatorLayer()
    let circle = CALayer()

    let duration: TimeInterval = 1.0
    let circleSize: CGFloat = 15
    let instanceCount = 20

    override func draw(_ rect: CGRect) {