SwiftUI: Publishing single view with data from multiple screens - firebase

Question

Using SwiftUI, I am trying to create an upload onboarding flow, using multiple screens, then storing that data to firebase. Imagine someone uploading their home to airbnb. You have multiple screens in a row (toggled with a back or next button) that gives you an end result of a single, vertically scrolling screen with all of your data that you have previously input.
I have a forum in my app, and have figured out to do this with a single screen of storing data (2 text fields - body and title). But how do I do this for multiple views of data.
I am very very new to programming and have been following a tutorial while trying to mold it to my own thing, so I apologize if the terminology (View, View Model, Model) is incorrect.
Forum code below:
Api:
class Api {
// static var Post = PostApi()
static var User = UserApi()
static var Forum = ForumApi()
}
ForumApi:
class ForumApi {
func uploadForumPost(forumPostTitle: String, forumPostBody: String, imageData: Data, onSuccess: #escaping() -> Void, onError: #escaping(_ errorMessage: String) -> Void) {
guard let userId = Auth.auth().currentUser?.uid else {
return
}
let forumPostId = Ref.FIRESTORE_MY_FORUM_POSTS_DOCUMENT_USERID(userId: userId).collection("userForumPosts").document().documentID
let storageForumPostRef = Ref.STORAGE_FORUM_POST_ID(forumPostId: forumPostId)
let metadata = StorageMetadata()
metadata.contentType = "image/jpg"
StorageService.saveForumPost(userId: userId, forumPostTitle: forumPostTitle, forumPostBody: forumPostBody, forumPostId: forumPostId, imageData: imageData, metadata: metadata, storageForumPostRef: storageForumPostRef, onSuccess: onSuccess, onError: onError)
}
}
Forum Post Model:
struct ForumPost: Encodable, Decodable{
var forumPostTitle: String
var forumPostBody: String
var likes: [String: Bool]
var location: String
var ownerId: String
var postId: String
var username: String
var avatar: String
var mediaUrl: String
var date: Double
var likeCount: Int
}
Forum Post View Model:
class ForumPostViewModel: ObservableObject {
var forumPostTitle: String = ""
var forumCategory: String = ""
var forumPostBody: String = ""
var imageData: Data = Data()
var errorString = ""
#Published var showAlert: Bool = false
func shareForumPost (completed: #escaping() -> Void, onError: #escaping(_ errorMesssage: String) -> Void) {
if !forumPostTitle.isEmpty && !forumPostBody.isEmpty {
//AuthService.signupUser(username: username, email: email, password: password, imageData: imageData, onSuccess: completed, onError: onError)
Api.Forum.uploadForumPost(forumPostTitle: forumPostTitle, forumPostBody: forumPostBody, imageData: imageData, onSuccess: completed, onError: onError)
} else {
showAlert = true
errorString = "Please fill in all fields"
}
}
}
Forum Profile View Model:
class ForumProfileViewModel: ObservableObject {
#Published var userForumPosts: [ForumPost] = []
#Published var isLoading = false
var searchText: String = ""
var splitted: [[ForumPost]] = []
func loadUserForumPosts(userId: String) {
isLoading = true
Api.User.loadForumPosts(userId: userId) { (userForumPosts) in
self.isLoading = false
self.userForumPosts = userForumPosts
self.splitted = self.userForumPosts.splited(into: 1)
}
}
}
Forum Profile View:
struct ForumProfileBody: View {
var userForumPost: ForumPost
#State var shouldSheetShow: Bool = false;
var body: some View {
VStack(alignment: .leading) {
VStack {
HStack {
Text(userForumPost.forumPostTitle)
.fontWeight(.semibold)
.font(.system(size: 22))
Spacer()
Image(systemName: "ellipsis")
}
}
//More UI code
}
}
}