How to initialize a Property from one struct in an other struct - swiftui

Question

I was looking for some Code (SwiftUI) to get a JSON File from a website into my Xcode Project, and I found a good Sample but when I try to change the Code and wanna use a 'var' from one struct in an other struct.
struct Course: Decodable, Identifiable, Hashable {
let id: Int
let name: String
var link: String
let imageUrl: String
let number_of_lessons: Int
}
class NetworkManager: ObservableObject {
#Published var courses = [Course]()
func getAllCourses() {
guard let url = URL(string: "https://api.letsbuildthatapp.com/jsondecodable/courses") else { return }
URLSession.shared.dataTask(with: url) { data, response, error in
do {
let courses = try JSONDecoder().decode([Course].self, from: data!)
DispatchQueue.main.async {
self.courses = courses
print(courses)
}
} catch {
print("Failed To decode: ", error)
}
}.resume()
}
init() {
getAllCourses()
}
}
struct SwiftUIView: View {
var cs:Course
var body: some View {
Text(cs.name)
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
SwiftUIView() //here it says Missing argument for parameter...
}
Xcode says: Missing argument for parameter 'cs' in call, Insert 'cs:<#Course#>'.

Answer 1

As you are trying to initialize a struct, you need to pass all properties with setters, here that is cs, as body is a get-only property.
You will need to pass a Course object via SwiftUIView(cs: course). This course can be just a static course, as it's only used in your SwiftUI preview.

Answer 2

Swift autogenerates initializers for structs, so your SwiftUIView has one like this:
public init(cs: Course) {
self.cs = cs
}
So in order to create an instance of your SwiftUIView in the previews you have to declare it like this:
struct ContentView_Previews: PreviewProvider {
static let cs = Course(id: 7,
name: "The best course",
link: "thebestcourse.com",
imageUrl: "thebestcourse.com/image.jpg",
number_of_lessons: 5)
static var previews: some View {
SwiftUIView(cs: cs)
}
}