Use of undeclared type BindableObject

Question

I am using the new SwiftUI to fetch Data from Web Api and Displaying Using SwiftUI and encounter and error and could not compile.

Error : Use of undeclared type BindableObject

*******ContentView.swift*********

import SwiftUI

struct ContentView: View {

@ObjectBinding var model = PostListViewModel()

var body: some View {

List(model.posts) { post in

Text(post.branchname)

}

struct ContentView_Previews: PreviewProvider {

static var previews: some View {

ContentView()

}

*******Post.swift*********

import Foundation

import SwiftUI

struct Post : Codable, Hashable, Identifiable {

//var id: ObjectIdentifier

let id : Int

let branchname : String

let aboutus : String

}

*******PostListViewModel.swift*********

import Foundation

import SwiftUI

import Combine

final class PostListViewModel: BindableObject {

init() {

fetchPosts()

}

var posts = [Post]() {

didSet {

didChange.send(self)

}

private func fetchPosts() {

Webservice().getAllPosts {

self.posts = $0

}

let didChange = PassthroughSubject<PostListViewModel,Never>()

}

SwiftUI

12k

Posted by

aulimge

Reply

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Answer 1

Last I recall, BindableObject was renamed to ObservableObject and @ObjectBinding is now @ObservedObject. Additionally, in an ObservableObject you no longer need to implement didChange yourself, you just use the @Published attribute on any properties you want to publish and the rest will be taken care of for you.

struct ContentView: View {

    @ObservedObject var model = PostListViewModel()

    var body: some View {
        List(model.posts) { post in
            Text(post.branchname)
        }
    }
}

final class PostListViewModel: ObservableObject {
    init() {
        fetchPosts()
    }
   
    @Published var posts = [Post]()
   
    private func fetchPosts() {
        Webservice().getAllPosts {
            self.posts = $0
        }
    }
}

Posted by

Jim Dovey

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Answer 2

If I understand well, your BindableObject class has to implement a didChange var:

such as:

class Person : BindableObject {
    let didChange = PassthroughSubject<void, never="">()
   
    var photoName:String { didSet { update() } }
    var title:String { didSet { update() } }
    var subtitle:String { didSet { update() } }
   
    init(photoName: String, title: String, subtitle: String) {
        self.photoName = photoName
        self.title = title
        self.subtitle = subtitle
    }
   
    func update() {
        didChange.send(())
    }
}

Detailed explanation here:

h ttps://www.sofapps.it/en/swiftuiframeworkprogramming-5.html

Posted by

Claude31

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Answer 3

Last I recall, BindableObject was renamed to ObservableObject and @ObjectBinding is now @ObservedObject. Additionally, in an ObservableObject you no longer need to implement didChange yourself, you just use the @Published attribute on any properties you want to publish and the rest will be taken care of for you.

struct ContentView: View {

    @ObservedObject var model = PostListViewModel()

    var body: some View {
        List(model.posts) { post in
            Text(post.branchname)
        }
    }
}

final class PostListViewModel: ObservableObject {
    init() {
        fetchPosts()
    }
   
    @Published var posts = [Post]()
   
    private func fetchPosts() {
        Webservice().getAllPosts {
            self.posts = $0
        }
    }
}

Posted by

Jim Dovey

Add a Comment

Answer 4

Thanks it works now i can compile.

Posted by

aulimge

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Use of undeclared type BindableObject

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