Kharauzov

func setCardChildViewController(_ viewController: UIViewController, hostView: CardView) {
    add(viewController)
    hostView.addSubview(viewController.view)
    hostView.backgroundColor = viewController.view.backgroundColor
    viewController.view.frame = CGRect(origin: hostView.bounds.origin, size: CGSize(width: hostView.bounds.size.width, height: hostView.bounds.size.height - CardsHolderView.Constants.subviewBottomOffset))
}

func setTopChildViewController(_ viewController: UIViewController) {
    add(viewController)
    customView.topView.addSubview(viewController.view)

Kharauzov

private func setChildViewControllers() {
    let topViewController = ProfileShortInfoViewController()
    view.backgroundColor = topViewController.view.backgroundColor
    let card1ViewController = ProfileActivityViewController()
    let card2ViewController = RecommendationsViewController()
    setTopChildViewController(topViewController)
    setCard1ChildViewController(card1ViewController)
    setCard2ChildViewController(card2ViewController)
    self.topViewController = topViewController
    self.activityViewController = card1ViewController

Kharauzov

// This view is a root view inside CardsHolderViewController
class CardsHolderView: UIView {
    
    let topView = UIView()
    let cardView1 = CardView()
    let cardView2 = CardView()
    
    ///
    /// some other code here
    ///

Kharauzov

    func add(_ child: UIViewController, shouldAddView: Bool = false) {
        addChild(child)
        if shouldAddView {
            view.addSubview(child.view)
        }
        child.didMove(toParent: self)
    }
    
    func remove(shouldRemoveView: Bool = false) {
        guard parent != nil else {

Kharauzov

struct ScreenSize {
    static let screenWidth        = UIScreen.main.bounds.size.width
    static let screenHeight       = UIScreen.main.bounds.size.height
    static let screenMaxLength    = max(ScreenSize.screenWidth, ScreenSize.screenHeight)
    static let screenMinLength    = min(ScreenSize.screenWidth, ScreenSize.screenHeight)
}

/// Type of device, based on screen size.

struct DeviceType {

Kharauzov

import UIKit

class ProfileView: UIView {
    
    // Some properties

    var titleLabel: UILabel
    var profileImageView: UIImageVew
    var profileImageViewTopConstraint: NSLayoutConstraint
    var titleLabelLeadingConstraint: NSLayoutConstraint

Kharauzov

import Foundation

/// SB - screen based
/// Use `definedValue` to get value, depending on the screen of device.
struct SBValue<T> {
    /// Corresponds to 4" screen
    let iPhoneSE: T
    /// Corresponds to 4.7" screen
    let iPhone8: T
    /// Corresponds to 5.5" screen

Kharauzov

import UIKit

class ProfileView: UIView {
    
    // Some properties
    
    var titleLabel: UILabel
    var profileImageView: UIImageVew
    var profileImageViewTopConstraint: NSLayoutConstraint
    var titleLabelLeadingConstraint: NSLayoutConstraint

Kharauzov

import Photos

extension PHPhotoLibrary {

    typealias PhotoAsset = PHAsset
    typealias PhotoAlbum = PHAssetCollection

    static func saveAssets(_ assets: [Any], albumName: String, completion: @escaping ([PHAsset]?)->()) {
        if let album = self.findAlbum(albumName: albumName) {
            saveAssets(assets, album: album, completion: completion)

Kharauzov

extension SwipingCollectionViewCell: UIGestureRecognizerDelegate {
    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
        return true
    }
}