Update sample

Examples/Samples/Sources/AppDelegate.swift

@@ -4,8 +4,18 @@
 //
 
 import UIKit
+import FloatingPanel
 
 @UIApplicationMain
 class AppDelegate: UIResponder, UIApplicationDelegate {
     var window: UIWindow?
+
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
+        FloatingPanelSurfaceView.appearance().shadowHidden = false
+        FloatingPanelSurfaceView.appearance().cornerRadius = 6.0
+        // FloatingPanelSurfaceView.appearance().backgroundColor = .lightGray
+        // FloatingPanelBackdropView.appearance().backgroundColor = .red
+        // GrabberHandleView.appearance().barColor = .red
+        return true
+    }
 }

Examples/Samples/Sources/ViewController.swift

@@ -123,10 +123,6 @@ class SampleListViewController: UIViewController {
         mainPanelVC = FloatingPanelController()
         mainPanelVC.delegate = self
 
-        // Initialize FloatingPanelController and add the view
-        mainPanelVC.surfaceView.cornerRadius = 6.0
-        mainPanelVC.surfaceView.shadowHidden = false
-
         // Set a content view controller
         mainPanelVC.set(contentViewController: contentVC)
 

Framework/Sources/FloatingPanel.swift

@@ -68,10 +68,8 @@ class FloatingPanel: NSObject, UIGestureRecognizerDelegate, UIScrollViewDelegate
         viewcontroller = vc
 
         surfaceView = FloatingPanelSurfaceView()
-        surfaceView.backgroundColor = .white
 
         backdropView = FloatingPanelBackdropView()
-        backdropView.backgroundColor = .black
         backdropView.alpha = 0.0
 
         self.layoutAdapter = FloatingPanelLayoutAdapter(surfaceView: surfaceView,

Framework/Sources/FloatingPanelBackdropView.swift

@@ -6,4 +6,26 @@
 import UIKit
 
 /// A view that presents a backdrop interface behind a floating panel.
-public class FloatingPanelBackdropView: UIView { }
+public class FloatingPanelBackdropView: UIView {
+    override init(frame: CGRect) {
+        super.init(frame: frame)
+        setUp()
+    }
+
+    required public init?(coder aDecoder: NSCoder) {
+        super.init(coder: aDecoder)
+        setUp()
+    }
+
+    private func setUp() {
+        layer.backgroundColor = UIColor.black.cgColor
+    }
+
+    @objc dynamic public override var backgroundColor: UIColor? {
+        get {
+            guard let color = layer.backgroundColor else { return nil }
+            return UIColor(cgColor: color)
+        }
+        set { layer.backgroundColor = newValue?.cgColor }
+    }
+}

Framework/Sources/FloatingPanelSurfaceView.swift

@@ -15,7 +15,7 @@ public class FloatingPanelSurfaceView: UIView {
     public let grabberHandle: GrabberHandleView = GrabberHandleView()
 
     /// Offset of the grabber handle from the top
-    public var grabberTopPadding: CGFloat = 6.0 { didSet {
+    @objc dynamic public var grabberTopPadding: CGFloat = 6.0 { didSet {
         setNeedsUpdateConstraints()
     } }
 
@@ -25,10 +25,10 @@ public class FloatingPanelSurfaceView: UIView {
     }
 
     /// Grabber view width and height
-    public var grabberHandleWidth: CGFloat = 36.0 { didSet {
+    @objc dynamic public var grabberHandleWidth: CGFloat = 36.0 { didSet {
         setNeedsUpdateConstraints()
     } }
-    public var grabberHandleHeight: CGFloat = 5.0 { didSet {
+    @objc dynamic public var grabberHandleHeight: CGFloat = 5.0 { didSet {
         setNeedsUpdateConstraints()
     } }
 
@@ -48,7 +48,7 @@ public class FloatingPanelSurfaceView: UIView {
     private var color: UIColor? = .white { didSet { setNeedsLayout() } }
     var bottomOverflow: CGFloat = 0.0 // Must not call setNeedsLayout()
 
-    public override var backgroundColor: UIColor? {
+    @objc dynamic public override var backgroundColor: UIColor? {
         get { return color }
         set { color = newValue }
     }
@@ -57,34 +57,34 @@ public class FloatingPanelSurfaceView: UIView {
     ///
     /// `self.contentView` is masked with the top rounded corners automatically on iOS 11 and later.
     /// On iOS 10, they are not automatically masked because of a UIVisualEffectView issue. See https://forums.developer.apple.com/thread/50854
-    public var cornerRadius: CGFloat {
+    @objc dynamic public var cornerRadius: CGFloat {
         set { containerView.layer.cornerRadius = newValue; setNeedsLayout() }
         get { return containerView.layer.cornerRadius }
     }
 
     /// A Boolean indicating whether the surface shadow is displayed.
-    public var shadowHidden: Bool = false  { didSet { setNeedsLayout() } }
+    @objc dynamic public var shadowHidden: Bool = false { didSet { setNeedsLayout() } }
 
     /// The color of the surface shadow.
-    public var shadowColor: UIColor = .black  { didSet { setNeedsLayout() } }
+    @objc dynamic public var shadowColor: UIColor = .black  { didSet { setNeedsLayout() } }
 
     /// The offset (in points) of the surface shadow.
-    public var shadowOffset: CGSize = CGSize(width: 0.0, height: 1.0)  { didSet { setNeedsLayout() } }
+    @objc dynamic public var shadowOffset: CGSize = CGSize(width: 0.0, height: 1.0)  { didSet { setNeedsLayout() } }
 
     /// The opacity of the surface shadow.
-    public var shadowOpacity: Float = 0.2 { didSet { setNeedsLayout() } }
+    @objc dynamic public var shadowOpacity: Float = 0.2 { didSet { setNeedsLayout() } }
 
     /// The blur radius (in points) used to render the surface shadow.
-    public var shadowRadius: CGFloat = 3  { didSet { setNeedsLayout() } }
+    @objc dynamic public var shadowRadius: CGFloat = 3  { didSet { setNeedsLayout() } }
 
     /// The width of the surface border.
-    public var borderColor: UIColor?  { didSet { setNeedsLayout() } }
+    @objc dynamic public var borderColor: UIColor?  { didSet { setNeedsLayout() } }
 
     /// The color of the surface border.
-    public var borderWidth: CGFloat = 0.0  { didSet { setNeedsLayout() } }
+    @objc dynamic public var borderWidth: CGFloat = 0.0  { didSet { setNeedsLayout() } }
 
     /// Offset of the container view from the top
-    public var containerTopInset: CGFloat = 0.0 { didSet {
+    @objc dynamic public var containerTopInset: CGFloat = 0.0 { didSet {
         setNeedsUpdateConstraints()
     } }
 

Framework/Sources/GrabberHandleView.swift

@@ -7,7 +7,9 @@ import UIKit
 
 public class GrabberHandleView: UIView {
 
-    public var barColor = UIColor(displayP3Red: 0.76, green: 0.77, blue: 0.76, alpha: 1.0) { didSet { backgroundColor = barColor } }
+    @objc dynamic public var barColor = UIColor(displayP3Red: 0.76, green: 0.77, blue: 0.76, alpha: 1.0) {
+        didSet { backgroundColor = barColor }
+    }
 
     required public init?(coder aDecoder: NSCoder) {
         super.init(coder: aDecoder)