Shows “Downloading [app]…” toast view when installing app from new source

Allows users to tap it to immediately see installation progress.

AltStore/Managing Apps/AppManager.swift

@@ -26,6 +26,7 @@ extension AppManager
     static let didUpdatePatronsNotification = Notification.Name("io.altstore.AppManager.didUpdatePatrons")
     static let didAddSourceNotification = Notification.Name("io.altstore.AppManager.didAddSource")
     static let didRemoveSourceNotification = Notification.Name("io.altstore.AppManager.didRemoveSource")
+    static let willInstallAppFromNewSourceNotification = Notification.Name("io.altstore.AppManager.willInstallAppFromNewSource")
     
     static let expirationWarningNotificationID = "altstore-expiration-warning"
     static let enableJITResultNotificationID = "altstore-enable-jit"
@@ -405,6 +406,7 @@ extension AppManager
                                       completionHandler: @escaping (Result<InstalledApp, Error>) -> Void) async -> RefreshGroup
     {
         @AsyncManaged var installingApp: AppProtocol = app
+        var didAddSource = false
         
         do
         {
@@ -446,6 +448,8 @@ extension AppManager
                     guard let storeApp = try DatabaseManager.shared.viewContext.fetch(fetchRequest).first else { throw OperationError.appNotFound(name: appName) }
                     return storeApp
                 }
+                
+                didAddSource = true
             }
         }
         catch
@@ -458,6 +462,15 @@ extension AppManager
         }
         
         let group = await $installingApp.perform { self.install($0, presentingViewController: presentingViewController, context: context, completionHandler: completionHandler) }
+        
+        if didAddSource
+        {
+            // Post notification from main queue _after_ assigning progress for it
+            await MainActor.run { [installingApp] in
+                NotificationCenter.default.post(name: AppManager.willInstallAppFromNewSourceNotification, object: installingApp)
+            }
+        }
+        
         return group
     }
 }

AltStore/Sources/SourcesViewController.swift

@@ -57,6 +57,8 @@ final class SourcesViewController: UICollectionViewController
     
     private lazy var dataSource = self.makeDataSource()
     
+    private weak var _installingApp: StoreApp?
+    
     private var placeholderView: RSTPlaceholderView!
     private var placeholderViewButton: UIButton!
     private var placeholderViewCenterYConstraint: NSLayoutConstraint!
@@ -115,6 +117,8 @@ final class SourcesViewController: UICollectionViewController
 
         self.navigationItem.rightBarButtonItem = self.editButtonItem
         
+        NotificationCenter.default.addObserver(self, selector: #selector(SourcesViewController.showInstallingAppToastView(_:)), name: AppManager.willInstallAppFromNewSourceNotification, object: nil)
+        
         self.update()
     }
     
@@ -512,6 +516,26 @@ private extension SourcesViewController
             self.editButtonItem.isEnabled = true
         }
     }
+    
+    @objc func showInstallingAppToastView(_ notification: Notification)
+    {
+        guard let app = notification.object as? StoreApp else { return }
+        self._installingApp = app
+        
+        let text = String(format: NSLocalizedString("Downloading %@…", comment: ""), app.name)        
+        let toastView = ToastView(text: text, detailText: NSLocalizedString("Tap to view progress.", comment: ""))
+        toastView.addTarget(self, action: #selector(SourcesViewController.showAppDetail), for: .touchUpInside)
+        toastView.show(in: self)
+    }
+    
+    @objc func showAppDetail()
+    {
+        guard let app = self._installingApp else { return }
+        self._installingApp = nil
+        
+        let appViewController = AppViewController.makeAppViewController(app: app)
+        self.navigationController?.pushViewController(appViewController, animated: true)
+    }
 }
 
 extension SourcesViewController