[AltStore] Adds redesigned BrowseViewController to browse and install apps

AltStore/Browse/BrowseViewController.swift

@@ -0,0 +1,172 @@
+//
+//  BrowseViewController.swift
+//  AltStore
+//
+//  Created by Riley Testut on 7/15/19.
+//  Copyright © 2019 Riley Testut. All rights reserved.
+//
+
+import UIKit
+
+import Roxas
+
+class BrowseViewController: UICollectionViewController
+{
+    private lazy var dataSource = self.makeDataSource()
+    
+    override func viewDidLoad()
+    {
+        super.viewDidLoad()
+        
+        self.collectionView.dataSource = self.dataSource
+        self.collectionView.prefetchDataSource = self.dataSource
+    }
+    
+    override func viewWillAppear(_ animated: Bool)
+    {
+        super.viewWillAppear(animated)
+        
+        self.fetchApps()
+    }
+    
+    override func viewDidLayoutSubviews()
+    {
+        super.viewDidLayoutSubviews()
+        
+        let collectionViewLayout = self.collectionViewLayout as! UICollectionViewFlowLayout
+        collectionViewLayout.itemSize.width = self.view.bounds.width
+    }
+}
+
+private extension BrowseViewController
+{
+    func makeDataSource() -> RSTFetchedResultsCollectionViewPrefetchingDataSource<App, UIImage>
+    {
+        let fetchRequest = App.fetchRequest() as NSFetchRequest<App>
+        fetchRequest.relationshipKeyPathsForPrefetching = [#keyPath(InstalledApp.app)]
+        fetchRequest.sortDescriptors = [NSSortDescriptor(keyPath: \App.name, ascending: false)]
+        fetchRequest.predicate = NSPredicate(format: "%K != %@", #keyPath(App.identifier), App.altstoreAppID)
+        fetchRequest.returnsObjectsAsFaults = false
+        
+        let dataSource = RSTFetchedResultsCollectionViewPrefetchingDataSource<App, UIImage>(fetchRequest: fetchRequest, managedObjectContext: DatabaseManager.shared.viewContext)
+        dataSource.cellConfigurationHandler = { [weak self] (cell, app, indexPath) in
+            guard let `self` = self else { return }
+            
+            let cell = cell as! BrowseCollectionViewCell
+            cell.nameLabel.text = app.name
+            cell.developerLabel.text = app.developerName
+            cell.subtitleLabel.text = app.subtitle
+            cell.imageNames = Array(app.screenshotNames.prefix(3))
+            cell.appIconImageView.image = UIImage(named: app.iconName)
+            
+            cell.actionButton.tag = indexPath.item
+            cell.actionButton.activityIndicatorView.style = .white
+            
+            // Explicitly set to false to ensure we're starting from a non-activity indicating state.
+            // Otherwise, cell reuse can mess up some cached values.
+            cell.actionButton.isIndicatingActivity = false
+            
+            let tintColor = app.tintColor ?? self.collectionView.tintColor!
+            cell.tintColor = tintColor
+            cell.actionButton.progressTintColor = tintColor
+            
+            if app.installedApp == nil
+            {
+                cell.actionButton.setTitle(NSLocalizedString("FREE", comment: ""), for: .normal)
+                cell.actionButton.setTitleColor(.altGreen, for: .normal)
+                cell.actionButton.backgroundColor = UIColor.altGreen.withAlphaComponent(0.1)
+                
+                if let progress = AppManager.shared.installationProgress(for: app)
+                {
+                    cell.actionButton.progress = progress
+                    cell.actionButton.isIndicatingActivity = true
+                    cell.actionButton.activityIndicatorView.isUserInteractionEnabled = false
+                    cell.actionButton.isUserInteractionEnabled = true
+                }
+                else
+                {
+                    cell.actionButton.progress = nil
+                    cell.actionButton.isIndicatingActivity = false
+                }
+            }
+            else
+            {
+                cell.actionButton.setTitle(NSLocalizedString("OPEN", comment: ""), for: .normal)
+                cell.actionButton.setTitleColor(.white, for: .normal)
+                cell.actionButton.backgroundColor = .altGreen
+            }
+        }
+        
+        return dataSource
+    }
+    
+    func fetchApps()
+    {
+        AppManager.shared.fetchApps() { (result) in
+            do
+            {
+                let apps = try result.get()
+                try apps.first?.managedObjectContext?.save()
+            }
+            catch
+            {
+                DispatchQueue.main.async {
+                    let toastView = RSTToastView(text: NSLocalizedString("Failed to Fetch Apps", comment: ""), detailText: error.localizedDescription)
+                    toastView.tintColor = .altGreen
+                    toastView.show(in: self.navigationController?.view ?? self.view, duration: 2.0)
+                }
+            }
+        }
+    }
+}
+
+private extension BrowseViewController
+{
+    @IBAction func performAppAction(_ sender: ProgressButton)
+    {
+        let indexPath = IndexPath(item: sender.tag, section: 0)
+        let app = self.dataSource.item(at: indexPath)
+        
+        if let installedApp = app.installedApp
+        {
+            self.open(installedApp)
+        }
+        else
+        {
+            self.install(app, at: indexPath)
+        }
+    }
+    
+    func install(_ app: App, at indexPath: IndexPath)
+    {
+        let previousProgress = AppManager.shared.installationProgress(for: app)
+        guard previousProgress == nil else {
+            previousProgress?.cancel()
+            return
+        }
+        
+        _ = AppManager.shared.install(app, presentingViewController: self) { (result) in
+            DispatchQueue.main.async {
+                switch result
+                {
+                case .failure(OperationError.cancelled): break // Ignore
+                case .failure(let error):
+                    let toastView = RSTToastView(text: "Failed to install \(app.name)", detailText: error.localizedDescription)
+                    toastView.tintColor = .altGreen
+                    toastView.show(in: self.navigationController!.view, duration: 2)
+                
+                case .success(let installedApp): print("Installed app:", installedApp.app.identifier)
+                }
+                
+                self.collectionView.reloadItems(at: [indexPath])
+            }
+        }
+        
+        self.collectionView.reloadItems(at: [indexPath])
+    }
+    
+    func open(_ installedApp: InstalledApp)
+    {
+        UIApplication.shared.open(installedApp.openAppURL)
+    }
+}