Squeeze the most out of Apple Pencil

10:24 - Respond to squeeze in UIKit

class MyViewController: UIViewController, UIPencilInteractionDelegate {
    
    func pencilInteraction(_ interaction: UIPencilInteraction, 
               didReceiveSqueeze squeeze: UIPencilInteraction.Squeeze) {

        if UIPencilInteraction.preferredSqueezeAction == .showContextualPalette &&
           squeeze.phase == .ended {
           let anchorPoint = squeeze.hoverPose?.location ?? myDefaultLocation
           presentMyContextualPaletteAtPosition(anchorPoint)
        }
    }
}

10:46 - Respond to squeeze in SwiftUI

@Environment(\.preferredPencilSqueezeAction) var preferredAction
@State var contextualPalettePresented = false
@State var contextualPaletteAnchor = MyPaletteAnchor.default

var body: some View {
    MyView()
        .onPencilSqueeze { phase in
            if preferredAction == .showContextualPalette, case let .ended(value) = phase {
                if let anchorPoint = value.hoverPose?.anchor {
                    contextualPaletteAnchor = .point(anchorPoint)
                }
                contextualPalettePresented = true
            }
        }
}

11:50 - Provide canvas feedback in UIKit

class MyViewController: UIViewController {
    @ViewLoading var feedbackGenerator: UICanvasFeedbackGenerator
    
    override func viewDidLoad() {
        super.viewDidLoad()
        feedbackGenerator = UICanvasFeedbackGenerator(view: view)
    }

    func dragAlignedToGuide(_ sender: MyDragGesture) {
        feedbackGenerator.alignmentOccurred(at: sender.location(in: view))
    }

    func snappedToShape(_ sender: MyDrawGesture) {
        feedbackGenerator.pathCompleted(at: sender.location(in: view))
    }
}

12:29 - Provide canvas feedback in SwiftUI

@State var dragAlignedToGuide = 0
@State var snappedToShape = 0
 var body: some View {
    MyView()
        .sensoryFeedback(.alignment, trigger: dragAlignedToGuide)
        .sensoryFeedback(.pathComplete, trigger: snappedToShape)
}