Add two simple UI blocks

LivePhotoToVideo/Modules/Permissions/PermissionsViewController.swift

@@ -7,7 +7,59 @@
 //
 
 import UIKit
+import Cartography
 
 public final class PermissionsViewController: UIViewController {
 
+    // MARK: - UI Elements
+    private lazy var headlineLabel: UILabel = {
+        let label = UILabel.UI.headline
+        label.text = "Allow Photos Access"
+        return label
+    }()
+
+    private lazy var statusLabel: UILabel = {
+        let label = UILabel.UI.body
+        label.text = "Photos access is unknown"
+        return label
+    }()
+
+    private lazy var button: UIButton = {
+        let button = UIButton.UI.big(title: "Allow Photos", color: .brown)
+        button.addTarget(self, action: #selector(tapAllowPhotos), for: .touchUpInside)
+        return button
+    }()
+
+    // MARK: - Lifecycle
+    public override func viewDidLoad() {
+        super.viewDidLoad()
+
+        setupUI()
+    }
+
+    // MARK: - Private methods
+    private func setupUI() {
+        view.backgroundColor = .white
+
+        view.addSubview(headlineLabel)
+        view.addSubview(button)
+        view.addSubview(statusLabel)
+
+        constrain(button, headlineLabel, statusLabel) { b, h, s in
+            [b, h, s].forEach {
+                $0.leading == $0.superview!.leading + 16
+                $0.trailing == $0.superview!.trailing - 16
+            }
+
+            h.top == h.superview!.top + 40
+            b.top == h.bottom + 16
+            s.top == b.bottom + 24
+            s.bottom <= s.superview!.bottom + 40
+        }
+    }
+
+    // MARK: - Actions
+    @objc private func tapAllowPhotos() {
+        statusLabel.text = statusLabel.text == "x" ? "TAP HAPPENED" : "x"
+    }
 }

LivePhotoToVideo/Modules/Photos/PhotoCollectionViewCell.swift

@@ -0,0 +1,40 @@
+//
+//  PhotoCollectionViewCell.swift
+//  UI
+//
+//  Created by Alex Agapov on 23/03/2019.
+//  Copyright © 2019 agapovco. All rights reserved.
+//
+
+import UIKit
+import Reusable
+import Cartography
+
+class PhotoCollectionViewCell: UICollectionViewCell, Reusable {
+
+    private let imageView = UIImageView()
+
+    init() {
+        super.init(frame: .zero)
+        setup()
+    }
+
+    required init?(coder aDecoder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    private func setup() {
+        addSubview(imageView)
+
+        constrain(imageView) { i in
+            i.edges == i.superview!.edges
+        }
+    }
+
+    var image: UIImage? {
+        didSet {
+            imageView.image = image
+        }
+    }
+
+}

LivePhotoToVideo/Modules/Photos/PhotoCollectionViewCell.xib

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="13142" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="12042"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <objects>
+        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
+        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
+        <collectionViewCell opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" id="gTV-IL-0wX" customClass="PhotoCollectionViewCell" customModuleProvider="target">
+            <rect key="frame" x="0.0" y="0.0" width="50" height="50"/>
+            <autoresizingMask key="autoresizingMask"/>
+            <view key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center">
+                <rect key="frame" x="0.0" y="0.0" width="50" height="50"/>
+                <color key="backgroundColor" red="0.0" green="0.0" blue="0.0" alpha="0.0" colorSpace="custom" customColorSpace="sRGB"/>
+            </view>
+            <viewLayoutGuide key="safeArea" id="ZTg-uK-7eu"/>
+        </collectionViewCell>
+    </objects>
+</document>

LivePhotoToVideo/Modules/Photos/PhotosViewController.swift

@@ -13,25 +13,35 @@ import RxCocoa
 import RxDataSources
 import Photos
 
-class PhotosViewController: UIViewController {
+public protocol PhotosViewModel {}
+
+public final class PhotosViewController: UIViewController {
 
     let disposeBag = DisposeBag()
 
     lazy var collectionView: UICollectionView = {
         let layout = UICollectionViewFlowLayout()
-        let side = self.view.frame.width / 2
+        let side = self.view.frame.width / 2 - 8
         layout.itemSize = CGSize(width: side, height: side)
         layout.minimumLineSpacing = 16
         let c = UICollectionView(frame: .zero, collectionViewLayout: layout)
+        c.register(cellType: PhotoCollectionViewCell.self)
         return c
     }()
 
     private var viewModel: PhotosViewModel!
 
-    override func viewDidLoad() {
-        super.viewDidLoad()
+    public init(viewModel: PhotosViewModel) {
+        self.viewModel = viewModel
+        super.init(nibName: nil, bundle: nil)
+    }
+
+    required init?(coder aDecoder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
 
-        viewModel = PhotosViewModel()
+    public override func viewDidLoad() {
+        super.viewDidLoad()
 
         view.addSubview(collectionView)
 
@@ -47,7 +57,6 @@ class PhotosViewController: UIViewController {
     private func setupBindings() {
 //        viewModel.photos
 
-
     }
 
     private var photos = PHFetchResult<PHAsset>()
@@ -65,23 +74,26 @@ class PhotosViewController: UIViewController {
     }()
 
     func fetchPhotos() {
-        DispatchQueue.global(qos: DispatchQoS.QoSClass.default).async {
+        DispatchQueue.global(qos: .default).async {
             let assets = PHAsset.fetchAssets(with: self.options)
 
             DispatchQueue.main.async {
-                photos = assets
+                self.photos = assets
+                self.collectionView.reloadData()
             }
         }
     }
 }
 
 extension PhotosViewController: UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
-    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
+    public func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
         return photos.count
     }
 
-    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
-        <#code#>
+    public func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
+        let cell: PhotoCollectionViewCell = collectionView.dequeueReusableCell(for: indexPath)
+
+        return cell
     }
 
 }

LivePhotoToVideo/Modules/Photos/PhotosViewModel.swift

@@ -6,11 +6,11 @@
 //  Copyright © 2017 agapovco. All rights reserved.
 //
 
-import Foundation
+import UI
 import RxSwift
 import RxCocoa
 
-class PhotosViewModel {
+class PhotosViewModelImpl: PhotosViewModel {
     private var service: PhotosService
 
     // MARK: - Input

LivePhotoToVideo/Resources/AppDelegate.swift

@@ -15,8 +15,12 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
 
     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
 
-        let storyboard = UIStoryboard(name: "Main", bundle: Bundle(for: PermissionsViewController.self))
+//        let viewController = PermissionsViewController()
+        let viewController = PhotosViewController(viewModel: PhotosViewModelImpl())
 
+        window = UIWindow()
+        window?.rootViewController = viewController
+        window?.makeKeyAndVisible()
 
         return true
     }

LivePhotoToVideo/Views/Button+Styles.swift

@@ -0,0 +1,33 @@
+//
+//  Button+Styles.swift
+//  UI
+//
+//  Created by Alex Agapov on 23/03/2019.
+//  Copyright © 2019 agapovco. All rights reserved.
+//
+
+import UIKit
+
+extension UIButton {
+    enum UI {
+        static func big(title: String, color: UIColor) -> UIButton {
+            let button = UIButton(type: .custom)
+
+            button.backgroundColor = color
+            button.layer.cornerRadius = 12
+
+            let font = UIFont.systemFont(ofSize: 20, weight: .light)
+
+            let normalTitle = NSAttributedString(string: title,
+                                                 attributes: [.font: font,
+                                                              .foregroundColor: UIColor.white])
+            button.setAttributedTitle(normalTitle, for: .normal)
+
+            let highlightedTitle = NSAttributedString(string: title,
+                                                      attributes: [.font: font,
+                                                                   .foregroundColor: UIColor.white.withAlphaComponent(0.75)])
+            button.setAttributedTitle(highlightedTitle, for: .highlighted)
+            return button
+        }
+    }
+}

LivePhotoToVideo/Views/Label+Styles.swift

@@ -0,0 +1,41 @@
+//
+//  Label+Styles.swift
+//  LivePhotoToVideo
+//
+//  Created by Alex Agapov on 23/03/2019.
+//  Copyright © 2019 agapovco. All rights reserved.
+//
+
+import UIKit
+
+extension UILabel {
+    enum UI {
+        static var headline: UILabel {
+            let label = UILabel()
+            let font = UIFont.systemFont(ofSize: 50, weight: .black)
+
+            if #available(iOS 11.0, *) {
+                label.font = UIFontMetrics(forTextStyle: .headline).scaledFont(for: font)
+            } else {
+                label.font = font
+            }
+            label.textColor = UIColor(white: 0.1, alpha: 1)
+            label.numberOfLines = 0
+            return label
+        }
+
+        static var body: UILabel {
+            let label = UILabel()
+            let font = UIFont.systemFont(ofSize: 20, weight: .semibold)
+
+            if #available(iOS 11.0, *) {
+                label.font = UIFontMetrics(forTextStyle: .headline).scaledFont(for: font)
+            } else {
+                label.font = font
+            }
+            label.textColor = UIColor(white: 0.25, alpha: 1)
+            label.numberOfLines = 0
+            return label
+        }
+    }
+}