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CHDataManagement/Views/Posts/AddPostView.swift

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+import SwiftUI
+
+struct AddPostView: View {
+
+    @Environment(\.dismiss)
+    private var dismiss: DismissAction
+
+    @Environment(\.language)
+    private var language: ContentLanguage
+
+    @EnvironmentObject
+    private var content: Content
+
+    @Binding
+    var selectedPost: Post?
+
+    @State
+    private var newPostId = ""
+
+    private let allowedCharactersInPostId = CharacterSet.alphanumerics.union(CharacterSet(charactersIn: "-")).inverted
+
+    init(selected: Binding<Post?>) {
+        self._selectedPost = selected
+    }
+
+    private var idExists: Bool {
+        content.posts.contains { $0.id == newPostId }
+    }
+
+    private var containsInvalidCharacters: Bool {
+        newPostId.rangeOfCharacter(from: allowedCharactersInPostId) != nil
+    }
+
+    var body: some View {
+        VStack {
+            Text("New post")
+                .font(.headline)
+
+            TextField("", text: $newPostId)
+                .textFieldStyle(.roundedBorder)
+                .frame(maxWidth: 350)
+            if newPostId.isEmpty {
+                Text("Enter the id of the new post to create")
+                    .foregroundStyle(.secondary)
+            } else if idExists {
+                Text("A post with the same id already exists")
+                    .foregroundStyle(Color.red)
+            } else if containsInvalidCharacters {
+                Text("The id contains invalid characters")
+                    .foregroundStyle(Color.red)
+            } else {
+                Text("Create a new post with the id")
+                    .foregroundStyle(.secondary)
+            }
+            HStack {
+                Button(role: .cancel, action: dismissSheet) {
+                    Text("Cancel")
+                }
+                Button(action: addNewPost) {
+                    Text("Create")
+                }
+                .disabled(newPostId.isEmpty || containsInvalidCharacters || idExists)
+            }
+        }
+        .padding()
+    }
+
+    private func addNewPost() {
+        let post = Post(
+            id: newPostId,
+            isDraft: true,
+            createdDate: .now,
+            startDate: .now,
+            endDate: nil,
+            tags: [],
+            german: .init(title: "Titel", content: "Text"),
+            english: .init(title: "Title", content: "Text"))
+        content.posts.insert(post, at: 0)
+        selectedPost = post
+        dismissSheet()
+    }
+
+    private func dismissSheet() {
+        dismiss()
+    }
+}
+
+#Preview {
+    AddPostView(selected: .constant(nil))
+        .environmentObject(Content.mock)
+}