Update for iOS 17.

App/Common UI/GradientView.swift

@@ -28,6 +28,11 @@ class GradientView: UIImageView
         self.init(image: nil)
         self.direction = direction
         self.colors = colors
+        
+        registerForTraitChanges([UITraitUserInterfaceStyle.self]) { [weak self] (traitEnvironment: Self, previousTraitCollection) in
+            self?.image = nil
+            self?.setNeedsLayout()
+        }
     }
     
     private func gradientImage(forSize size: CGSize) -> UIImage? {
@@ -70,12 +75,4 @@ class GradientView: UIImageView
             generatedImageSize = bounds.size
         }
     }
-    
-    override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
-        super.traitCollectionDidChange(previousTraitCollection)
-        
-        // Regenerate image
-        image = nil
-        setNeedsLayout()
-    }
 }

App/Common UI/ReliefButton.swift

@@ -69,12 +69,14 @@ class ReliefButton: UIButton
         backgroundView.layer.rasterizationScale = UIScreen.main.scale
         addSubview(backgroundView)
         
-        traitCollectionDidChange(nil)
+        registerForTraitChanges([UITraitUserInterfaceStyle.self], handler: handleTraitCollectionChange)
         
         pointerStyleProvider = { (button, pointerEffect, pointerShape) -> UIPointerStyle? in
             let preview = UITargetedPreview(view: button)
             return UIPointerStyle(effect: .lift(preview), shape: pointerShape)
         }
+        
+        handleTraitCollectionChange(self, previousCollection: nil)
     }
     
     required init?(coder: NSCoder) {
@@ -99,7 +101,7 @@ class ReliefButton: UIButton
         return inverted ? colors.reversed() : colors
     }
     
-    override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
+    private func handleTraitCollectionChange(_ environment: UITraitEnvironment, previousCollection: UITraitCollection?) {
         setBackgroundInverted(isHighlighted)
         backgroundView.layer.borderColor = { traitCollection -> UIColor in
             if traitCollection.userInterfaceStyle == .dark {
@@ -107,7 +109,7 @@ class ReliefButton: UIButton
             } else {
                 return .white
             }
-        }(traitCollection).cgColor
+        } (traitCollection).cgColor
     }
     
     internal func setBackgroundInverted(_ inverted: Bool) {