make pop menu above source view

PopMenu/Classes/Helpers/Haptics.swift

@@ -9,14 +9,13 @@
 import UIKit
 
 /// Haptic Generator Helper.
+@available(iOS 10.0, *)
 public enum Haptic {
 
     /// Impact style.
-    @available(iOS 10.0, *)
     case impact(UIImpactFeedbackGenerator.FeedbackStyle)
 
     /// Notification style.
-    @available(iOS 10.0, *)
     case notification(UINotificationFeedbackGenerator.FeedbackType)
 
     /// Selection style.

PopMenu/Classes/Helpers/UIView+Shadows.swift

@@ -19,4 +19,7 @@ extension UIView {
         layer.masksToBounds = false
     }
 
+    public func addShadow(_ setting: PopMenuShadowColor) {
+        addShadow(offset: setting.offset, opacity: setting.opacity, radius: setting.radius, color: setting.color)
+    }
 }

PopMenu/Classes/PopMenuAppearance.swift

@@ -50,7 +50,12 @@ final public class PopMenuAppearance: NSObject {
 
     /// The presentation style
     public var popMenuPresentationStyle: PopMenuPresentationStyle = .cover()
+
+    /// The menu will overlay on source view or not
+    public var popMenuAboveSourceView = false
 
+    /// The menu shadow setting
+    public var popMenuShadowColor: PopMenuShadowColor = .default()
 }
 
 /// Background styles for PopMenu.
@@ -199,3 +204,29 @@ public enum PopMenuDirection {
     case bottom
     case none
 }
+
+/// Menu Shadow setting structure to control PopMenu shadow.
+public struct PopMenuShadowColor {
+
+    /// Shadow offset.
+    public let offset: CGSize
+
+    /// Shadow opacity.
+    public let opacity: Float
+
+    /// Shadow radius.
+    public let radius: CGFloat
+
+    /// Shadow color.
+    public let color: Color
+
+    /// Get shadow's color instance with default setting
+    public static func `default`() -> PopMenuShadowColor {
+        return PopMenuShadowColor(offset: .init(width: 0, height: 1), opacity: 0.5, radius: 20, color: .black)
+    }
+
+    /// Get shadow's color instance with custom setting
+    public static func custom(offset: CGSize = .zero, opacity: Float = 0.65, radius: CGFloat = 20, color: Color = .black) -> PopMenuShadowColor {
+        return PopMenuShadowColor(offset: offset, opacity: opacity, radius: radius, color: color)
+    }
+}

PopMenu/View Controller & Views/PopMenuViewController.swift

@@ -260,7 +260,7 @@ extension PopMenuViewController {
     /// Setup the content view.
     fileprivate func configureContentView() {
         containerView.translatesAutoresizingMaskIntoConstraints = false
-        containerView.addShadow(offset: .init(width: 0, height: 1), opacity: 0.5, radius: 20)
+        containerView.addShadow(appearance.popMenuShadowColor)
         containerView.layer.cornerRadius = appearance.popMenuCornerRadius
         containerView.backgroundColor = .clear
 
@@ -361,6 +361,23 @@ extension PopMenuViewController {
             desiredOrigin.x = minContentPos
         }
 
+        if appearance.popMenuAboveSourceView {
+            let minContentPos: CGFloat = UIScreen.main.bounds.size.height * 0.05
+            let maxContentPos: CGFloat = UIScreen.main.bounds.size.height * 0.95
+
+            let offsetY = sourceFrame.size.height
+            desiredOrigin.y += offsetY
+            if (desiredOrigin.y + size.height) > maxContentPos {
+                desiredOrigin.y -= 2 * offsetY
+            }
+            if (desiredOrigin.y + size.height) > maxContentPos {
+                desiredOrigin.y = maxContentPos - size.height
+            }
+            if desiredOrigin.y < minContentPos {
+                desiredOrigin.y = minContentPos
+            }
+        }
+
         // Move content in place
         translateOverflowX(desiredOrigin: &desiredOrigin, contentSize: size)
         translateOverflowY(desiredOrigin: &desiredOrigin, contentSize: size)
@@ -565,7 +582,11 @@ extension PopMenuViewController {
                 guard !action.highlighted else { return }
 
                 if shouldEnableHaptics {
-                    Haptic.selection.generate()
+                    if #available(iOS 10.0, *) {
+                        Haptic.selection.generate()
+                    } else {
+                        // Fallback on earlier versions
+                    }
                 }
 
                 // Highlight current action view.