Async loading from url more than one image in SwiftUI - swift

Question

I'm trying to write a code that loads more than one image (between 5 and 10) from url. I use Theaudiodb api (loaded images are photos of artists). The problem is that only last image is displayed. In ContentView I have ForEach that loads between 5 and 10 ArtistImage(s) struct. I know that all images data are loaded (in ImageFetcher var imageData will set I put print(newValue) and it shows data loaded (for example: 148273 bytes ,etc). Just cannot understand why just the last image is displayed.
struct ArtistImage: View {
var imageURL: URL?
#ObservedObject private var imageFetcher: ImageFetcher
init(imageURL: String) {
self.imageURL = URL(string: imageURL)
imageFetcher = ImageFetcher(imageURL: self.imageURL)
}
var body: some View {
if let uiImage = UIImage(data: imageFetcher.imageData) {
return AnyView(Image(uiImage: UIImage(data: self.imageFetcher.imageData)!)
.renderingMode(.original)
.resizable()
.cornerRadius(10))
} else {
return AnyView(Text("Loading...")
.onAppear(perform: { self.imageFetcher.getImage() }))
}
}
and the ImageFetcher class below:
class ImageFetcher: ObservableObject {
public let objectWillChange = PassthroughSubject<Data,Never>()
public private(set) var imageData = Data() {
willSet {
print(newValue) // it tells me all images are loaded
objectWillChange.send(newValue)
}
}
var imageURL: URL?
public init(imageURL: URL?) {
self.imageURL = imageURL
}
func getImage() {
guard let url = imageURL else { return }
URLSession.shared.dataTask(with: url) { (data, _, _) in
guard let data = data else {
return
}
DispatchQueue.main.async {
self.imageData = data
}
}.resume()
}
Content View:
struct ContentView: View {
#ObservedObject var networkManager = NetworkManager()
init() {
networkManager.createArtistsDatabase()
}
var body: some View {
ScrollView(.vertical) {
GeometryReader { geo in
Button( action: {} ) {
ZStack(alignment: .bottom) {
Image("cp")
.renderingMode(.original)
.aspectRatio(contentMode: .fill)
.frame(width: geo.size.width, height: geo.size.height)
.clipped()
VStack(alignment: .center) {
Text("Featured artist").foregroundColor(.yellow).font(.custom("AvenirNext-Regular",size: 16)).padding(.bottom, 8)
Text(("Coldplay").uppercased()).foregroundColor(.white).font(.custom("AvenirNext-Bold", size:24))
}.frame(width: geo.size.width, height: 80).background(Color.black.opacity(0.5))
}
}
}.frame(height: 400.0)
VStack(alignment:.leading){
Text("Discover new artists").font(.custom("AvenirNext-Regular", size: 16)).padding(.top,10)
ScrollView(.horizontal) {
HStack {
ForEach(self.networkManager.artistsDB, id:\.self) { data in
Button(action:{} ) {
VStack {
ArtistImage(imageURL: data.artistImage)
.frame(width: 150, height: 150)
.cornerRadius(10)
Text(data.artistName).foregroundColor((.secondary)).font(.custom("AvenirNext-Regular", size: 14))
}
}
}
}.frame(height: 180)
}
}.frame(minWidth: 0, maxWidth:.infinity,maxHeight: .infinity, alignment: .leading).padding(.leading, 10)
}.edgesIgnoringSafeArea(.top)
}
}
Network Manager class:
class NetworkManager: ObservableObject {
#Published var artistsDB = [Artist]()
func createArtistsDatabase() {
let artistsNames: [String] = ["Madonna", "Metallica","Coldplay","Toto","Kraftwerk","Depeche%20Mode"]
for ar in artistsNames {
findArtistBy(name: ar)
}
}
func findArtistBy(id: String = "", name: String = "") {
var url: URL?
if id != "" {
guard let urlID = URL.getArtistByID(id: id) else { return }
url = urlID
} else {
guard let urlName = URL.getArtistByName(name: name) else { return }
url = urlName
}
let urlRequest = URLRequest(url: url!)
let task = URLSession.shared.dataTask(with: urlRequest) { data,response,error in
if error != nil || data == nil {
print("Client error")
return
}
guard let response = response as? HTTPURLResponse, (200...299).contains(response.statusCode) else {
print("Server error")
return
}
guard let mime = response.mimeType, mime == "application/json" else {
print("Wrong mime type")
return
}
guard let dataToDecode = data else { return }
do {
let decoder = JSONDecoder()
let dataJSONed = try decoder.decode(DBArtist.self, from: dataToDecode)
DispatchQueue.main.async {
print(dataJSONed.artist[0])
self.artistsDB.append(dataJSONed.artist[0])
}
} catch {
print("Error while decoding!")
}
}
task.resume()
}
URL extension:
extension URL {
static func getArtistByID(id: String) -> URL? {
return URL(string: "https://theaudiodb.com/api/v1/json/1/artist.php?i=\((id))")
}
static func getArtistByName(name: String) ->URL? {
print("https://www.theaudiodb.com/api/v1/json/1/search.php?s=\(name)")
return URL(string: "https://www.theaudiodb.com/api/v1/json/1/search.php?s=\(name)")
}
}