refactor: Reduce duplication code with UIApplication.keyWindow and .topController and improve alert function

AltStore/Extensions/UIApplication+Alert.swift

@@ -1,26 +0,0 @@
-//
-//  UIApplication+Alert.swift
-//  SideStore
-//
-//  Created by naturecodevoid on 5/20/23.
-//  Copyright © 2023 SideStore. All rights reserved.
-//
-
-extension UIApplication {
-    static func alertOk(title: String?, message: String?) {
-        let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
-        alert.addAction(UIAlertAction(title: NSLocalizedString("Ok", comment: ""), style: .default))
-        
-        DispatchQueue.main.async {
-            let keyWindow = UIApplication.shared.windows.filter { $0.isKeyWindow }.first
-            if var topController = keyWindow?.rootViewController {
-                while let presentedViewController = topController.presentedViewController {
-                    topController = presentedViewController
-                }
-                topController.present(alert, animated: true)
-            } else {
-                print("No key window!")
-            }
-        }
-    }
-}

AltStore/Extensions/UIApplication+SideStore.swift

@@ -0,0 +1,47 @@
+//
+//  UIApplication+SideStore.swift
+//  SideStore
+//
+//  Created by naturecodevoid on 5/20/23.
+//  Copyright © 2023 SideStore. All rights reserved.
+//
+
+extension UIApplication {
+    static var keyWindow: UIWindow? {
+        UIApplication.shared.windows.filter { $0.isKeyWindow }.first
+    }
+    
+    static var topController: UIViewController? {
+        if var topController = keyWindow?.rootViewController {
+            while let presentedViewController = topController.presentedViewController {
+                topController = presentedViewController
+            }
+            return topController
+        }
+        return nil
+    }
+    
+    static func alert(
+        title: String? = nil,
+        message: String? = nil,
+        leftButton: (text: String, action: ((UIAlertAction) -> Void)?)? = nil,
+        rightButton: (text: String, action: ((UIAlertAction) -> Void)?)? = nil,
+        leftButtonStyle: UIAlertAction.Style = .default,
+        rightButtonStyle: UIAlertAction.Style = .default
+    ) {
+        let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
+        if let leftButton = leftButton {
+            alert.addAction(UIAlertAction(title: leftButton.text, style: leftButtonStyle, handler: leftButton.action))
+        }
+        if let rightButton = rightButton {
+            alert.addAction(UIAlertAction(title: rightButton.text, style: rightButtonStyle, handler: rightButton.action))
+        }
+        if rightButton == nil && leftButton == nil {
+            alert.addAction(UIAlertAction(title: NSLocalizedString("Ok", comment: ""), style: .default))
+        }
+        
+        DispatchQueue.main.async {
+            topController?.present(alert, animated: true)
+        }
+    }
+}

AltStore/Operations/AuthenticationOperation.swift

@@ -297,7 +297,7 @@ private extension AuthenticationOperation
     func present(_ viewController: UIViewController) -> Bool
     {
         if UnstableFeatures.enabled(.swiftUI) {
-            UIApplication.shared.keyWindow?.rootViewController?.present(viewController, animated: true)
+            UIApplication.topController?.present(viewController, animated: true)
         } else {
             guard let presentingViewController = self.presentingViewController else { return false }
             
@@ -324,7 +324,7 @@ private extension AuthenticationOperation
         if let presentingViewController {
             presentingViewController.dismiss(animated: true)
         }
-//        UIApplication.shared.keyWindow?.rootViewController?.presentedViewController?.dismiss(animated: true)
+//        UIApplication.topController?.dismiss(animated: true)
     }
 }
 
@@ -450,15 +450,7 @@ private extension AuthenticationOperation
                             completionHandler(nil)
                         })
                         
-                        let keyWindow = UIApplication.shared.windows.filter { $0.isKeyWindow }.first
-                        
-                        if var topController = keyWindow?.rootViewController {
-                            while let presentedViewController = topController.presentedViewController {
-                                topController = presentedViewController
-                            }
-                            
-                            topController.present(alertController, animated: true, completion: nil)
-                        }
+                        UIApplication.topController?.present(alertController, animated: true, completion: nil)
                     }
                 }
                     

AltStore/Operations/FetchAnisetteDataOperation.swift

@@ -156,14 +156,8 @@ final class FetchAnisetteDataOperation: ResultOperation<ALTAnisetteData>, WebSoc
             self.finish(.failure(OperationError.cancelled))
         }))
 
-        let keyWindow = UIApplication.shared.windows.filter { $0.isKeyWindow }.first
-
         DispatchQueue.main.async {
-            if let presentingController = keyWindow?.rootViewController?.presentedViewController {
-                presentingController.present(alert, animated: true)
-            } else {
-                keyWindow?.rootViewController?.present(alert, animated: true)
-            }
+            UIApplication.topController?.present(alert, animated: true)
         }
     }
     

AltStore/Operations/InstallAppOperation.swift

@@ -187,11 +187,7 @@ final class InstallAppOperation: ResultOperation<InstalledApp>
                             }))
                             
                             DispatchQueue.main.async {
-                                let keyWindow = UIApplication.shared.windows.filter { $0.isKeyWindow }.first
-                                if var topController = keyWindow?.rootViewController {
-                                    while let presentedViewController = topController.presentedViewController {
-                                        topController = presentedViewController
-                                    }
+                                if var topController = UIApplication.topController {
                                     topController.present(alert, animated: true)
                                 } else {
                                     print("No key window? Let's just open Safari")

AltStore/SwiftUI/Helper/SideloadingManager.swift

@@ -248,7 +248,6 @@ class SideloadingManager {
             }
         })
         
-        let rootViewController = UIApplication.shared.keyWindow?.rootViewController
-        rootViewController?.present(alertController, animated: true, completion: nil)
+        UIApplication.topController?.present(alertController, animated: true, completion: nil)
     }
 }

AltStore/SwiftUI/View Components/AppPillButton.swift

@@ -85,8 +85,7 @@ struct AppPillButton: View {
             return
         }
         
-        let _ = AppManager.shared.install(storeApp, presentingViewController: UIApplication.shared.keyWindow?.rootViewController) { result in
-            
+        let _ = AppManager.shared.install(storeApp, presentingViewController: UIApplication.topController) { result in
             switch result {
             case let .success(installedApp):
                 print("Installed app: \(installedApp.bundleIdentifier)")

AltStore/SwiftUI/Views/Settings/SettingsView.swift

@@ -225,7 +225,6 @@ struct SettingsView: View {
                 Text(L10n.SettingsView.debug)
             }
 
-            
             Section {} footer: {
                 Text("SideStore \(appVersion)")
                     .multilineTextAlignment(.center)
@@ -257,7 +256,7 @@ struct SettingsView: View {
 //    }
     
     func connectAppleID() {
-        guard let rootViewController = UIApplication.shared.keyWindow?.rootViewController else {
+        guard let rootViewController = UIApplication.topController else {
             return
         }
 

AltStore/Unstable Features/UnstableFeatures+SwiftUI.swift

@@ -17,14 +17,14 @@ extension UnstableFeatures {
             let rootView = RootView()
                 .environment(\.managedObjectContext, DatabaseManager.shared.viewContext)
             
-            UIApplication.shared.keyWindow?.rootViewController = UIHostingController(rootView: rootView)
+            UIApplication.topController = UIHostingController(rootView: rootView)
         }
         
         static func onDisable() {
             let storyboard = UIStoryboard(name: "Main", bundle: .main)
             let rootVC = storyboard.instantiateViewController(withIdentifier: "tabBarController") as! TabBarController
             
-            UIApplication.shared.keyWindow?.rootViewController = rootVC
+            UIApplication.topController = rootVC
         }
     }
 }