iPadOSのポインタの作成 – WWDC2020

// Enable the button's built-in pointer interaction.
myButton.isPointerInteractionEnabled = true

// Customize the default interaction effect.
myButton.pointerStyleProvider = { button, proposedEffect, proposedShape -> UIPointerStyle? in
        // In this example, we'll switch to using the .lift effect by creating a new
    // UIPointerEffect with the .lift type using the proposedEffect's preview.
    return UIPointerStyle(effect: .lift(proposedEffect.preview), shape: proposedShape)
}

// 下記コンテンツエフェクト画像のポインタ実装サンプル
// Create a UIPointerStyle that applies the .highlight effect. 

// Outset the view's frame so the pointer shape has some generous padding around the view's contents.
// Note that this frame must be in the provided UITargetedPreview's container's coordinate space. 
// In the majority of cases (where the preview doesn't have a custom container), this is just the view's superview.
let rect = myView.frame.insetBy(dx: -8.0, dy: -4.0)
let preview = UITargetedPreview(view: myView)

return UIPointerStyle(effect: .highlight(preview), shape: .roundedRect(rect))

// 下記シェイプカスタマイゼーションの画像を実装するサンプル
// Create a UIPointerStyle that changes the pointer into a vertical beam. 

let beamLength = myFont.lineHeight
// constrainedAxes vertical指定でポインタがテキスト上を水平に動くように見せる
return UIPointerStyle(shape: .verticalBeam(length: beamLength), constrainedAxes: .vertical)

// ポインタが範囲に来たら区切り線のViewをフェードアウトし、範囲から出たらフェードバックする

func pointerInteraction(_ interaction: UIPointerInteraction, 
                          willEnter region: UIPointerRegion, 
                          animator: UIPointerInteractionAnimating) {

     // Fade out separator when entering region.
     animator.addAnimations {
          self.separatorView.alpha = 0.0
     }
}

func pointerInteraction(_ interaction: UIPointerInteraction, 
                          willExit region: UIPointerRegion, 
                          animator: UIPointerInteractionAnimating) {

     // Fade separator back in when exiting region.
     animator.addAnimations {
          self.separatorView.alpha = 1.0
     }
}