ContentView.swift
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ContentView.swift
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	import SwiftUI

	struct ContentView: View {
	@ObservedObject var postStore: PostStore
	@State private var selectedCollection: PostCollection = allPostsCollection

	var body: some View {
	NavigationView {
	VStack {
	PostList(
	title: selectedCollection.title,
	posts: showPosts(for: selectedCollection)
	)
	.frame(maxHeight: .infinity)
	.toolbar {
	NavigationLink(destination: PostEditor(post: Post())) {
	Image(systemName: "plus")
	}
	}
	CollectionPicker(selectedCollection: $selectedCollection)
	}

	Text("Select a post, or create a new draft.")
	.foregroundColor(.secondary)
	}
	.environmentObject(postStore)
	}

	func showPosts(for: PostCollection) -> [Post] {
	if selectedCollection == allPostsCollection {
	return postStore.posts
	} else {
	return postStore.posts.filter { $0.collection.title == selectedCollection.title }
	}
	}
	}

	struct ContentView_Previews: PreviewProvider {
	static var previews: some View {
	ContentView(postStore: testPostStore)
	}
	}