Use selectedCollection, NavLinks in PostList, split view for iOS/macOS

Shared/Navigation/ContentView.swift

@@ -2,16 +2,12 @@ import SwiftUI
 
 struct ContentView: View {
     @ObservedObject var postStore: PostStore
-    @State private var selectedCollection: PostCollection? = allPostsCollection
 
     var body: some View {
         NavigationView {
             CollectionSidebar()
 
-                PostList(
-                    title: selectedCollection?.title ?? allPostsCollection.title,
-                    posts: showPosts(for: selectedCollection ?? allPostsCollection)
-                )
+            PostList(selectedCollection: allPostsCollection)
 
             Text("Select a post, or create a new draft.")
                 .foregroundColor(.secondary)

Shared/Post/PostCell.swift

@@ -5,21 +5,18 @@ struct PostCell: View {
     @ObservedObject var post: Post
 
     var body: some View {
-        NavigationLink(
-            destination: PostEditor(post: post)
-        ) {
-            HStack {
-                VStack(alignment: .leading) {
-                    Text(post.title)
-                        .font(.headline)
-                        .lineLimit(1)
-                    Text(buildDateString(from: post.createdDate))
-                        .font(.caption)
-                        .lineLimit(1)
-                }
-                Spacer()
-                PostStatusBadge(post: post)
+        HStack {
+            VStack(alignment: .leading) {
+                Text(post.title)
+                    .font(.headline)
+                    .lineLimit(1)
+                Text(buildDateString(from: post.createdDate))
+                    .font(.caption)
+                    .lineLimit(1)
             }
+            Spacer()
+            PostStatusBadge(post: post)
+        }
         .padding(5)
     }
 

Shared/Post/PostList.swift

@@ -2,18 +2,55 @@ import SwiftUI
 
 struct PostList: View {
     @EnvironmentObject var postStore: PostStore
-    var title: String
-    var posts: [Post]
+    @State var selectedCollection: PostCollection
 
     var body: some View {
+        #if os(iOS)
         List {
-            Text(pluralizedPostCount(for: posts))
-                .foregroundColor(.secondary)
-            ForEach(posts) { post in
-                PostCell(post: post)
+            ForEach(showPosts(for: selectedCollection)) { post in
+                NavigationLink(
+                    destination: PostEditor(post: post)
+                ) {
+                    PostCell(
+                        post: post
+                    )
+                }
             }
         }
-        .navigationTitle(title)
+        .navigationTitle(selectedCollection.title)
+        .toolbar {
+            ToolbarItem(placement: .primaryAction) {
+                Button(action: {
+                    let post = Post()
+                    postStore.add(post)
+                }, label: {
+                    Image(systemName: "square.and.pencil")
+                })
+            }
+            ToolbarItem(placement: .bottomBar) {
+                Spacer()
+            }
+            ToolbarItem(placement: .bottomBar) {
+                Text(pluralizedPostCount(for: showPosts(for: selectedCollection)))
+            }
+            ToolbarItem(placement: .bottomBar) {
+                Spacer()
+            }
+        }
+        #else //if os(macOS)
+        List {
+            ForEach(showPosts(for: selectedCollection)) { post in
+                NavigationLink(
+                    destination: PostEditor(post: post)
+                ) {
+                    PostCell(
+                        post: post
+                    )
+                }
+            }
+        }
+        .navigationTitle(selectedCollection.title)
+        .navigationSubtitle(pluralizedPostCount(for: showPosts(for: selectedCollection)))
         .toolbar {
             Button(action: {
                 let post = Post()
@@ -22,9 +59,10 @@ struct PostList: View {
                 Image(systemName: "square.and.pencil")
             })
         }
+        #endif
     }
 
-    func pluralizedPostCount(for posts: [Post]) -> String {
+    private func pluralizedPostCount(for posts: [Post]) -> String {
         if posts.count == 1 {
             return "1 post"
         } else {
@@ -45,7 +83,9 @@ struct PostList: View {
 
 struct PostList_Previews: PreviewProvider {
     static var previews: some View {
-        PostList(title: "Posts", posts: testPostData)
-            .environmentObject(testPostStore)
+        Group {
+            PostList(selectedCollection: allPostsCollection)
+                .environmentObject(testPostStore)
+        }
     }
 }

Shared/PostCollection/CollectionSidebar.swift

@@ -7,7 +7,8 @@ struct CollectionSidebar: View {
         List {
             ForEach(collections) { collection in
                 NavigationLink(
-                    destination: PostList(title: collection.title, posts: showPosts(for: collection)).tag(collection)) {
+                    destination: PostList(selectedCollection: collection)
+                ) {
                     Text(collection.title)
                 }
             }