[AltStore] Adds redesigned AppViewController to view/download AltStore apps

AltStore/App Detail/AppViewController.swift

@@ -0,0 +1,406 @@
+//
+//  AppViewController.swift
+//  AltStore
+//
+//  Created by Riley Testut on 7/22/19.
+//  Copyright © 2019 Riley Testut. All rights reserved.
+//
+
+import UIKit
+
+import Roxas
+
+class AppViewController: UIViewController
+{
+    var app: App!
+    
+    private var contentViewController: AppContentViewController!
+    private var contentViewControllerShadowView: UIView!
+    
+    private var blurAnimator: UIViewPropertyAnimator?
+    
+    private var contentSizeObservation: NSKeyValueObservation?
+    
+    @IBOutlet private var scrollView: UIScrollView!
+    @IBOutlet private var contentView: UIView!
+    
+    @IBOutlet private var headerView: UIView!
+    @IBOutlet private var headerContentView: UIView!
+    
+    @IBOutlet private var backButton: UIButton!
+    @IBOutlet private var backButtonContainerView: UIVisualEffectView!
+    
+    @IBOutlet private var nameLabel: UILabel!
+    @IBOutlet private var developerLabel: UILabel!
+    @IBOutlet private var downloadButton: PillButton!
+    @IBOutlet private var appIconImageView: UIImageView!
+    
+    @IBOutlet private var backgroundAppIconImageView: UIImageView!
+    @IBOutlet private var backgroundBlurView: UIVisualEffectView!
+    
+    private var _isEnteringForeground = false
+    private var _backgroundBlurEffect: UIBlurEffect?
+    private var _backgroundBlurTintColor: UIColor?
+    
+    override func viewDidLoad()
+    {
+        super.viewDidLoad()
+        
+        self.contentViewControllerShadowView = UIView()
+        self.contentViewControllerShadowView.backgroundColor = .white
+        self.contentViewControllerShadowView.layer.cornerRadius = 38
+        self.contentViewControllerShadowView.layer.shadowColor = UIColor.black.cgColor
+        self.contentViewControllerShadowView.layer.shadowOffset = CGSize(width: 0, height: -1)
+        self.contentViewControllerShadowView.layer.shadowRadius = 10
+        self.contentViewControllerShadowView.layer.shadowOpacity = 0.3
+        self.contentViewController.view.superview?.insertSubview(self.contentViewControllerShadowView, at: 0)
+        
+        self.contentView.addGestureRecognizer(self.scrollView.panGestureRecognizer)
+        
+        self.contentViewController.view.layer.cornerRadius = 38
+        self.contentViewController.view.layer.masksToBounds = true
+        
+        self.contentViewController.tableView.panGestureRecognizer.require(toFail: self.scrollView.panGestureRecognizer)
+        self.contentViewController.tableView.showsVerticalScrollIndicator = false
+        
+        self.headerView.frame = CGRect(x: 0, y: 0, width: 300, height: 93)
+        self.headerView.layer.cornerRadius = 24
+        self.headerView.layer.masksToBounds = true
+        
+        // Bring to front so the scroll indicators are visible.
+        self.view.bringSubviewToFront(self.scrollView)
+        self.scrollView.isUserInteractionEnabled = false
+        
+        self.nameLabel.text = self.app.name
+        self.developerLabel.text = self.app.developerName
+        self.developerLabel.textColor = self.app.tintColor
+        self.appIconImageView.image = UIImage(named: self.app.iconName)
+        self.downloadButton.tintColor = self.app.tintColor
+        self.backgroundAppIconImageView.image = UIImage(named: self.app.iconName)
+        
+        self.backButtonContainerView.tintColor = self.app.tintColor
+        
+        self.contentSizeObservation = self.contentViewController.tableView.observe(\.contentSize) { (tableView, change) in
+            self.view.setNeedsLayout()
+            self.view.layoutIfNeeded()
+        }
+        
+        self.update()
+        
+        NotificationCenter.default.addObserver(self, selector: #selector(AppViewController.didChangeApp(_:)), name: .NSManagedObjectContextObjectsDidChange, object: DatabaseManager.shared.viewContext)
+        NotificationCenter.default.addObserver(self, selector: #selector(AppViewController.willEnterForeground(_:)), name: UIApplication.willEnterForegroundNotification, object: nil)
+        
+        self._backgroundBlurEffect = self.backgroundBlurView.effect as? UIBlurEffect
+        self._backgroundBlurTintColor = self.backgroundBlurView.contentView.backgroundColor
+    }
+    
+    override func viewWillAppear(_ animated: Bool)
+    {
+        super.viewWillAppear(animated)
+
+        self.prepareBlur()
+        
+        // Update blur immediately.
+        self.view.setNeedsLayout()
+        self.view.layoutIfNeeded()
+
+        self.transitionCoordinator?.animate(alongsideTransition: { (context) in
+            self.hideNavigationBar()
+        }, completion: nil)
+    }
+    
+    override func viewDidAppear(_ animated: Bool)
+    {
+        super.viewDidAppear(animated)
+        
+        self.hideNavigationBar()
+    }
+    
+    override func viewWillDisappear(_ animated: Bool)
+    {
+        super.viewWillDisappear(animated)
+
+        // Guard against "dismissing" when presenting via 3D Touch pop.
+        guard self.navigationController != nil else { return }
+
+        // Store reference since self.navigationController will be nil after disappearing.
+        let navigationController = self.navigationController
+        navigationController?.navigationBar.barStyle = .default // Don't animate, or else status bar might appear messed-up.
+
+        self.transitionCoordinator?.animate(alongsideTransition: { (context) in
+            self.showNavigationBar(for: navigationController)
+        }, completion: { (context) in
+            if context.isCancelled
+            {
+                self.hideNavigationBar(for: navigationController)
+            }
+            else
+            {
+                self.showNavigationBar(for: navigationController)
+            }
+        })
+    }
+    
+    override func prepare(for segue: UIStoryboardSegue, sender: Any?)
+    {
+        guard segue.identifier == "embedAppContentViewController" else { return }
+        
+        self.contentViewController = segue.destination as? AppContentViewController
+        self.contentViewController.app = self.app
+    }
+    
+    override func viewDidLayoutSubviews()
+    {
+        super.viewDidLayoutSubviews()
+        
+        if self._isEnteringForeground
+        {
+            // Returning from background messes up some of our UI, so reset affected components now.
+            
+            if self.navigationController?.topViewController == self
+            {
+                self.hideNavigationBar()
+            }
+            
+            self.prepareBlur()
+            
+            self._isEnteringForeground = false
+        }
+        
+        let statusBarHeight = UIApplication.shared.statusBarFrame.height
+        
+        let inset = 12 as CGFloat
+        let padding = 20 as CGFloat
+        
+        let backButtonSize = self.backButton.sizeThatFits(CGSize(width: 1000, height: 1000))
+        let backButtonFrame = CGRect(x: inset, y: statusBarHeight,
+                                     width: backButtonSize.width + 20, height: backButtonSize.height + 20)
+        
+        var headerFrame = CGRect(x: inset, y: 0, width: self.view.bounds.width - inset * 2, height: self.headerView.bounds.height)
+        var contentFrame = CGRect(x: 0, y: 0, width: self.view.bounds.width, height: self.view.bounds.height)
+        var backgroundIconFrame = CGRect(x: 0, y: 0, width: self.view.bounds.width, height: self.view.bounds.width)
+        
+        let minimumHeaderY = backButtonFrame.maxY + 8
+        
+        let minimumContentY = minimumHeaderY + headerFrame.height + padding
+        let maximumContentY = self.view.bounds.width * 0.75
+        
+        // A full blur is too much, so we reduce the visible blur by 0.3, resulting in 70% blur.
+        let minimumBlurFraction = 0.3 as CGFloat
+        
+        let difference = (maximumContentY - minimumContentY)
+        
+        if self.scrollView.contentOffset.y > difference
+        {
+            // Full screen
+            
+            headerFrame.origin.y = minimumHeaderY
+            contentFrame.origin.y = minimumContentY
+            backgroundIconFrame.origin.y = 0
+            
+            self.contentViewController.tableView.contentOffset.y = self.scrollView.contentOffset.y - difference
+        }
+        else
+        {
+            // Partial screen
+            
+            contentFrame.origin.y = maximumContentY - self.scrollView.contentOffset.y
+            headerFrame.origin.y = contentFrame.origin.y - padding - headerFrame.height
+            
+            let cornerRadius = self.contentViewControllerShadowView.layer.cornerRadius
+            
+            // Stretch the app icon image to fill additional vertical space if necessary.
+            let height = max(contentFrame.origin.y + cornerRadius * 2, backgroundIconFrame.height)
+            backgroundIconFrame.size.height = height
+            
+            // Keep content table view's content offset at the top.
+            self.contentViewController.tableView.contentOffset.y = 0
+            
+            if self.scrollView.contentOffset.y < 0
+            {
+                // Determine how much to lessen blur by.
+                
+                let range = 75 as CGFloat
+                
+                let fraction = min(-self.scrollView.contentOffset.y, range) / range
+                
+                let fractionComplete = (fraction * (1.0 - minimumBlurFraction)) + minimumBlurFraction
+                self.blurAnimator?.fractionComplete = fractionComplete
+            }
+            else
+            {
+                // Set blur to default.
+                
+                self.blurAnimator?.fractionComplete = minimumBlurFraction
+            }
+        }
+        
+        // Keep background app icon centered in gap between top of content and top of screen.
+        backgroundIconFrame.origin.y = (contentFrame.origin.y / 2) - backgroundIconFrame.height / 2
+        
+        // Set frames.
+        self.contentViewController.view.superview?.frame = contentFrame
+        self.headerView.frame = headerFrame
+        self.backgroundAppIconImageView.frame = backgroundIconFrame
+        self.backgroundBlurView.frame = backgroundIconFrame
+        self.backButtonContainerView.frame = backButtonFrame
+        
+        self.headerContentView.frame = CGRect(x: 0, y: 0, width: self.headerView.bounds.width, height: self.headerView.bounds.height)
+        self.contentViewControllerShadowView.frame = self.contentViewController.view.frame
+        
+        self.backButtonContainerView.layer.cornerRadius = self.backButtonContainerView.bounds.midY
+        
+        self.scrollView.scrollIndicatorInsets.top = statusBarHeight
+        
+        // Adjust content offset + size.
+        let contentOffset = self.scrollView.contentOffset
+        
+        var contentSize = self.contentViewController.tableView.contentSize
+        contentSize.height += minimumContentY + self.view.safeAreaInsets.bottom + self.contentViewController.tableView.contentInset.bottom
+        
+        self.scrollView.contentSize = contentSize
+        self.scrollView.contentOffset = contentOffset
+    }
+    
+    deinit
+    {
+        self.blurAnimator?.stopAnimation(true)
+    }
+}
+
+private extension AppViewController
+{
+    func update()
+    {
+        self.downloadButton.isIndicatingActivity = false
+        
+        if self.app.installedApp == nil
+        {
+            self.downloadButton.setTitle(NSLocalizedString("FREE", comment: ""), for: .normal)
+            self.downloadButton.isInverted = false
+        }
+        else
+        {
+            self.downloadButton.setTitle(NSLocalizedString("OPEN", comment: ""), for: .normal)
+            self.downloadButton.isInverted = true
+        }
+        
+        let progress = AppManager.shared.installationProgress(for: self.app)
+        self.downloadButton.progress = progress
+    }
+    
+    func showNavigationBar(for navigationController: UINavigationController? = nil)
+    {
+        let navigationController = navigationController ?? self.navigationController
+        navigationController?.navigationBar.barStyle = .default
+        navigationController?.navigationBar.alpha = 1.0
+        navigationController?.navigationBar.setBackgroundImage(nil, for: .default)
+    }
+    
+    func hideNavigationBar(for navigationController: UINavigationController? = nil)
+    {
+        let navigationController = navigationController ?? self.navigationController
+        navigationController?.navigationBar.barStyle = .black
+        navigationController?.navigationBar.alpha = 0.0
+        navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
+    }
+    
+    func prepareBlur()
+    {
+        if let animator = self.blurAnimator
+        {
+            animator.stopAnimation(true)
+        }
+        
+        self.backgroundBlurView.effect = self._backgroundBlurEffect
+        self.backgroundBlurView.contentView.backgroundColor = self._backgroundBlurTintColor
+        
+        self.blurAnimator = UIViewPropertyAnimator(duration: 1.0, curve: .linear) {
+            self.backgroundBlurView.effect = nil
+            self.backgroundBlurView.contentView.backgroundColor = .clear
+        }
+
+        self.blurAnimator?.startAnimation()
+        self.blurAnimator?.pauseAnimation()
+    }
+}
+
+extension AppViewController
+{
+    @IBAction func popViewController(_ sender: UIButton)
+    {
+        self.navigationController?.popViewController(animated: true)
+    }
+    
+    @IBAction func performAppAction(_ sender: PillButton)
+    {
+        if let installedApp = self.app.installedApp
+        {
+            self.open(installedApp)
+        }
+        else
+        {
+            self.downloadApp()
+        }
+    }
+    
+    func downloadApp()
+    {
+        guard self.app.installedApp == nil else { return }
+        
+        let progress = AppManager.shared.install(self.app, presentingViewController: self) { (result) in
+            do
+            {
+                _ = try result.get()
+            }
+            catch OperationError.cancelled
+            {
+                // Ignore
+            }
+            catch
+            {
+                DispatchQueue.main.async {
+                    let toastView = ToastView(text: error.localizedDescription, detailText: nil)
+                    toastView.show(in: self.navigationController!.view, duration: 2)
+                }
+            }
+            
+            DispatchQueue.main.async {
+                self.downloadButton.progress = nil
+                self.update()
+            }
+        }
+        
+        self.downloadButton.progress = progress
+    }
+    
+    func open(_ installedApp: InstalledApp)
+    {
+        UIApplication.shared.open(installedApp.openAppURL)
+    }
+}
+
+private extension AppViewController
+{
+    @objc func didChangeApp(_ notification: Notification)
+    {
+        self.update()
+    }
+    
+    @objc func willEnterForeground(_ notification: Notification)
+    {
+        guard let navigationController = self.navigationController, navigationController.topViewController == self else { return }
+        
+        self._isEnteringForeground = true
+        self.view.setNeedsLayout()
+    }
+}
+
+extension AppViewController: UIScrollViewDelegate
+{
+    func scrollViewDidScroll(_ scrollView: UIScrollView)
+    {
+        self.view.setNeedsLayout()
+        self.view.layoutIfNeeded()
+    }
+}