add apple tv app

iphone/Werkout_ios/Views/WorkoutDetail/WorkoutDetailViewModel.swift

@@ -0,0 +1,39 @@
+//
+//  MainViewViewModel.swift
+//  Werkout_ios
+//
+//  Created by Trey Tartt on 6/14/23.
+//
+
+import Combine
+import Foundation
+
+class WorkoutDetailViewModel: ObservableObject {
+    enum WorkoutDetailViewModelStatus {
+        case loading
+        case showWorkout(Workout)
+    }
+    
+    @Published var status: WorkoutDetailViewModelStatus
+    let isPreview: Bool
+    
+    init(workout: Workout, status: WorkoutDetailViewModelStatus? = nil, isPreview: Bool) {
+        self.status = .loading
+        self.isPreview = isPreview
+        
+        if let passedStatus = status {
+            self.status = passedStatus
+        } else {
+            WorkoutDetailFetchable(workoutID: workout.id).fetch(completion: { result in
+                switch result {
+                case .success(let model):
+                    DispatchQueue.main.async {
+                        self.status = .showWorkout(model)
+                    }
+                case .failure(let failure):
+                    fatalError("failed \(failure.localizedDescription)")
+                }
+            })
+        }
+    }
+}