Add support for pointer interactions

Author: daprice

Example/Pods/Pods.xcodeproj/project.pbxproj

@@ -0,0 +1,54 @@
+//
+//  TactileSlider+UIPointerInteractionDelegate.swift
+//  TactileSlider
+//
+//  Created by Dale Price on 5/1/20.
+//
+
+import Foundation
+import UIKit
+
+@available(iOS 13.4, *)
+extension TactileSlider: UIPointerInteractionDelegate {
+	
+	internal func setUpPointerInteraction() {
+		let pointerInteraction = UIPointerInteraction(delegate: self)
+		self.addInteraction(pointerInteraction)
+	}
+	
+	public func targetedPreview(for interaction: UIPointerInteraction) -> UITargetedPreview? {
+		if let interactionView = interaction.view {
+			let previewParameters = UIPreviewParameters()
+			previewParameters.visiblePath = UIBezierPath(roundedRect: bounds, cornerRadius: automaticCornerRadius)
+			previewParameters.backgroundColor = .clear
+			
+			return UITargetedPreview(view: interactionView, parameters: previewParameters)
+		}
+		
+		return nil
+	}
+	
+	/// override this to set a custom pointer interaction style
+	open func pointerStyle(with targetedPreview: UITargetedPreview) -> UIPointerStyle {
+		return UIPointerStyle(
+			effect: UIPointerEffect.hover(targetedPreview, preferredTintMode: UIPointerEffect.TintMode.overlay, prefersShadow: false, prefersScaledContent: true)
+		)
+	}
+	
+	open func pointerInteraction(_ interaction: UIPointerInteraction, regionFor request: UIPointerRegionRequest, defaultRegion: UIPointerRegion) -> UIPointerRegion? {
+		return UIPointerRegion(rect: self.bounds)
+	}
+	
+	open func pointerInteraction(_ interaction: UIPointerInteraction, styleFor region: UIPointerRegion) -> UIPointerStyle? {
+		var style: UIPointerStyle? = nil
+		
+		if isPointerInteractionEnabled {
+			if let targetedPreview = targetedPreview(for: interaction) {
+				style = pointerStyle(with: targetedPreview)
+			}
+		}
+		
+		return style
+	}
+	
+}

TactileSlider/Classes/TactileSlider+UIPointerInteractionDelegate.swift

@@ -116,7 +116,16 @@ import UIKit
 		}
 	}
 
+	/// If true, the slider will use a hover effect as the pointer hovers over it.
+	///
+	/// Override the `pointerStyle(with:)` method to customize the effect.
+	///
+	/// - Requires: iOS 13.4
+	@IBInspectable open var isPointerInteractionEnabled: Bool = true
+	
 	/// If true, the slider will animate its scale when it is being dragged
+	///
+	/// - Warning: Not recommended together with `isPointerInteractionEnabled = true`
 	@IBInspectable open var scaleUpWhenInUse: Bool = false
 
 	/// The color of the track the slider slides along
@@ -142,7 +151,7 @@ import UIKit
 	@IBInspectable open var cornerRadius: CGFloat = -1 {
 		didSet {
 			if cornerRadius < 0 {
-				renderer.cornerRadius = min(bounds.width, bounds.height) / 3.3
+				renderer.cornerRadius = automaticCornerRadius
 			} else {
 				renderer.cornerRadius = cornerRadius
 			}
@@ -176,6 +185,14 @@ import UIKit
 		}
 	}
 
+	internal var automaticCornerRadius: CGFloat {
+		if cornerRadius < 0 {
+			return min(bounds.width, bounds.height) / 3.3
+		} else {
+			return cornerRadius
+		}
+	}
+	
 	private let renderer = TactileSliderLayerRenderer()
 
 	private var dragGestureRecognizer: UIPanGestureRecognizer!
@@ -240,10 +257,11 @@ import UIKit
 		setTapEnabled()
 		if #available(iOS 13.4, *) {
 			setScrollingEnabled()
+			setUpPointerInteraction()
 		}
 
 		renderer.tactileSlider = self
-		renderer.cornerRadius = cornerRadius
+		renderer.cornerRadius = automaticCornerRadius
 		traitCollectionDidChange(nil)
 
 		layer.backgroundColor = UIColor.clear.cgColor
@@ -405,7 +423,7 @@ import UIKit
 
 	private func updateLayerFrames() {
 		if cornerRadius < 0 {
-			renderer.cornerRadius = min(bounds.width, bounds.height) / 3.3
+			renderer.cornerRadius = automaticCornerRadius
 		}
 		renderer.updateBounds(bounds)
 	}