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2:38 - Document-based application

@main
struct WritingApp: App {
    var body: some Scene {
        DocumentGroup(newDocument: { StoryDocument() }) { file in
            StoryView(document: $file.document)
        }
    }
}

3:26 - Presenting a document from the browser in iOS 17

class DocumentViewController: UIDocumentViewController { ... }

let documentViewController = DocumentViewController()
let browserViewController = UIDocumentBrowserViewController(
    forOpening: [.plainText]
)
window.rootViewController = browserViewController

3:38 - Presenting a document from the browser in iOS 17

class DocumentViewController: UIDocumentViewController { ... }

let documentViewController = DocumentViewController()
let browserViewController = UIDocumentBrowserViewController(
    forOpening: [.plainText]
)
window.rootViewController = browserViewController
browserViewController.delegate = self

3:43 - Presenting a document from the browser in iOS 17

class DocumentViewController: UIDocumentViewController { ... }

let documentViewController = DocumentViewController()
let browserViewController = UIDocumentBrowserViewController(
    forOpening: [.plainText]
)
window.rootViewController = browserViewController
browserViewController.delegate = self

// MARK: UIDocumentBrowserViewControllerDelegate

func documentBrowser(
    _ browser: UIDocumentBrowserViewController, 
    didPickDocumentsAt documentURLs: [URL]
) {
    guard let url = documentURLs.first else { return }
    documentViewController.document = StoryDocument(fileURL: url)
    browser.present(documentViewController, animated: true)
}

3:56 - Presenting a document from the browser in iOS 18

class DocumentViewController: UIDocumentViewController { ... }

let documentViewController = DocumentViewController()
window.rootViewController = documentViewController

4:38 - Customize the document launch experience: background

DocumentGroup(
    newDocument: { StoryDocument() }
) { file in
    StoryView(document: $file.document)
}

DocumentGroupLaunchScene {
...
} background: {
    Image(.pinkJungle)
        .resizable()
        .aspectRatio(contentMode: .fill)
}

4:49 - Customize the document launch experience: new document button title

DocumentGroup(
    newDocument: { StoryDocument() }
) { file in
    StoryView(document: $file.document)
}
DocumentGroupLaunchScene {
    NewDocumentButton("Start Writing")
} background: {
    Image(.pinkJungle)
        .resizable()
        .aspectRatio(contentMode: .fill)
}

5:29 - Customize the document launch experience: accessory views

DocumentGroupLaunchScene {
    NewDocumentButton("Start Writing")
} background: {
    Image(.pinkJungle)
        .resizable()
        .aspectRatio(contentMode: .fill)
} overlayAccessoryView: {

}

5:44 - Position accessory views

DocumentGroupLaunchScene {
    NewDocumentButton("Start Writing")
} background: {
    Image(.pinkJungle)
        .resizable()
        .aspectRatio(contentMode: .fill)
} overlayAccessoryView: { geometry in

}

5:53 - Position accessory views

DocumentGroupLaunchScene {
    NewDocumentButton("Start Writing")
} background: {
...
} overlayAccessoryView: { geometry in
    ZStack {
        Image(.robot)
            .position(
                x: geometry.titleViewFrame.minX, 
                y: geometry.titleViewFrame.minY
            )
        Image(.plant)
            .position(
                x: geometry.titleViewFrame.maxX, 
                y: geometry.titleViewFrame.maxY
            )
    }
}

6:11 - Customize the document launch experience in a UIKit app

class DocumentViewController: UIDocumentViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Update the background
        launchOptions.background.image = UIImage(resource: .pinkJungle)

        // Add foreground accessories
        launchOptions.foregroundAccessoryView = ForegroundAccessoryView()
    }
}

7:31 - Create a document from a template: add a button

DocumentGroupLaunchScene {
    NewDocumentButton("Start Writing")
    NewDocumentButton("Choose a Template", for: StoryDocument.self) {

    }
}

7:45 - Create a document from a template: return document later

@State private var creationContinuation: CheckedContinuation<StoryDocument?, any Error>?

DocumentGroupLaunchScene {
    NewDocumentButton("Start Writing")
    NewDocumentButton("Choose a Template", for: StoryDocument.self) {
        try await withCheckedThrowingContinuation { continuation in
            self.creationContinuation = continuation
       }
    }
}

7:56 - Create a document from a template: present a template picker

@State private var creationContinuation: CheckedContinuation<StoryDocument?, any Error>?
@State private var isTemplatePickerPresented = false

DocumentGroupLaunchScene {
    NewDocumentButton("Start Writing")
    NewDocumentButton("Choose a Template", for: StoryDocument.self) {
        try await withCheckedThrowingContinuation { continuation in
            self.creationContinuation = continuation
            self.isTemplatePickerPresented = true
        }
    }
    .sheet(isPresented: $isTemplatePickerPresented) {
        TemplatePicker(continuation: $creationContinuation
    }
}

8:07 - Create a document from a template: template picker view

struct TemplatePicker: View {
    @Binding var creationContinuation: CheckedContinuation<StoryDocument?, any Error>?

    var body: some View {
        Button("Three Act Structure") {
            creationContinuation?.resume(returning: StoryDocument.threeActStructure())
            creationContinuation = nil
        }
    }
}

extension StoryDocument {
    static func threeActStructure() -> Self {
        Self.init(...)
    }
}

8:20 - Create a document from a template in UIKit

extension UIDocument.CreationIntent {
    static let template = UIDocument.CreationIntent("template")
}

8:29 - Create a document from a template in UIKit

launchOptions.secondaryAction = LaunchOptions.createDocumentAction(with: .template) 
launchOptions.browserViewController.delegate = self

// MARK: UIDocumentBrowserViewControllerDelegate

func documentBrowser(
    _ browser: UIDocumentBrowserViewController, 
    didRequestDocumentCreationWithHandler importHandler: @escaping (URL?, ImportMode) -> Void) 
{
    switch browser.activeDocumentCreationIntent {
    case .template: 
        presentTemplatePicker(with: importHandler)
    default:
        let newDocumentURL = // ...
        importHandler(newDocumentURL, .copy)
    }
}