Pointer effects

App/Common UI/ReliefButton.swift

@@ -70,6 +70,11 @@ class ReliefButton: UIButton
         addSubview(backgroundView)
         
         traitCollectionDidChange(nil)
+        
+        pointerStyleProvider = { (button, pointerEffect, pointerShape) -> UIPointerStyle? in
+            let preview = UITargetedPreview(view: button)
+            return UIPointerStyle(effect: .lift(preview), shape: pointerShape)
+        }
     }
     
     required init?(coder: NSCoder) {

App/Common UI/SegmentedReliefButton.swift

@@ -14,6 +14,11 @@ class SegmentedReliefButton: ReliefButton
         didSet  { children.forEach { addSubview($0) }; setNeedsLayout() }
     }
     
+    override var isPointerInteractionEnabled: Bool {
+        set { children.forEach { $0.isPointerInteractionEnabled = newValue } }
+        get { children.first?.isPointerInteractionEnabled ?? false }
+    }
+    
     private let backgroundsContainerView = UIView(frame: .zero)
     private var childrenHighlighObservations: [NSKeyValueObservation] = []
     
@@ -30,7 +35,8 @@ class SegmentedReliefButton: ReliefButton
     }
     
     override var isHighlighted: Bool {
-        didSet {}
+        // Does not highlight. Only children do. 
+        set {} get { false }
     }
     
     required init?(coder: NSCoder) {