39.6 The Document Structure
When the example project was created, Xcode generated a file named DocDemoDocument.swift, an instance of which is passed to ContentView within the App declaration. As generated, this file reads as follows:
import SwiftUI
import UniformTypeIdentifiers
extension UTType {
static var exampleText: UTType {
UTType(importedAs: "com.example.plain-text")
}
}
struct DocDemoDocument: FileDocument {
var text: String
init(text: String = "Hello, world!") {
self.text = text
}
static var readableContentTypes: [UTType] { [.exampleText] }
init(configuration: ReadConfiguration) throws {
&...
