SwiftUI functions execute in wrong order - swift

Question

I'm building a SwiftUI app with CRUD functionality with a mysql db. The CRUD operations work fine and after the create, update, or delete function the read function is called to get the updated data from the db. When I run the app the read function seems to be called before the create, update of delete function if I look at the console output so I only see the mutation after running the app again. Any idea how to fix this?
This is my create code
struct NewPostView: View {
#EnvironmentObject var viewModel: ViewModel
#Binding var isPresented: Bool
#Binding var title: String
#Binding var post: String
#State var isAlert = false
var body: some View {
NavigationView {
ZStack {
Color.gray.opacity(0.1).edgesIgnoringSafeArea(.all)
VStack(alignment: .leading) {
Text("Create new post")
.font(Font.system(size: 16, weight: .bold))
TextField("Title", text: $title)
.padding()
.background(Color.white)
.cornerRadius(6)
.padding(.bottom)
TextField("Write something...", text: $post)
.padding()
.background(Color.white)
.cornerRadius(6)
.padding(.bottom)
Spacer()
}.padding()
.alert(isPresented: $isAlert, content: {
let title = Text("No data")
let message = Text("Please fill your title and post")
return Alert(title: title, message: message)
})
}
.navigationBarTitle("New post", displayMode: .inline)
.navigationBarItems(leading: leading, trailing: trailing)
}
}
var leading: some View {
Button(action: {
isPresented.toggle()
}, label: {
Text("Cancel")
})
}
var trailing: some View {
Button(action: {
if title != "" && post != "" {
let parameters: [String: Any] = ["title": title, "post": post]
print(parameters)
viewModel.createPost(parameters: parameters)
viewModel.fetchPosts()
isPresented.toggle()
} else {
isAlert.toggle()
}
}, label: {
Text("Post")
})
}
}
ViewModel
class ViewModel: ObservableObject {
#Published var items = [PostModel]()
let prefixURL = "https://asreconnect.nl/CRM/php/app"
init() {
fetchPosts()
}
//MARK: - retrieve data
func fetchPosts() {
guard let url = URL(string: "\(prefixURL)/posts.php") else {
print("Not found url")
return
}
URLSession.shared.dataTask(with: url) { (data, res, error) in
if error != nil {
print(data!)
print("error", error?.localizedDescription ?? "")
return
}
do {
if let data = data {
print(data)
let result = try JSONDecoder().decode(DataModel.self, from: data)
DispatchQueue.main.async {
self.items = result.data
print(result)
}
} else {
print("No data")
}
} catch let JsonError {
print("fetch json error:", JsonError.localizedDescription)
print(String(describing: JsonError))
}
}.resume()
}
//MARK: - create data
func createPost(parameters: [String: Any]) {
guard let url = URL(string: "\(prefixURL)/create.php") else {
print("Not found url")
return
}
let data = try! JSONSerialization.data(withJSONObject: parameters)
print(data)
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.httpBody = data
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
URLSession.shared.dataTask(with: request) { (data, res, error) in
if error != nil {
print("error", error?.localizedDescription ?? "")
return
}
do {
if let data = data {
let result = try JSONDecoder().decode(DataModel.self, from: data)
DispatchQueue.main.async {
print(result)
}
} else {
print("No data")
}
} catch let JsonError {
print("fetch json error:", JsonError.localizedDescription)
}
}.resume()
}
}