change addMotionEffect optionally

PKHUD/FrameView.swift

@@ -64,4 +64,28 @@ internal class FrameView: UIVisualEffectView {
             contentView.addSubview(_content)
         }
     }
+
+    func updateMottionEffects(isEnable: Bool) {
+        motionEffects = []
+
+        guard isEnable else {
+            return
+        }
+
+        let offset = 20.0
+
+        let motionEffectsX = UIInterpolatingMotionEffect(keyPath: "center.x", type: .tiltAlongHorizontalAxis)
+        motionEffectsX.maximumRelativeValue = offset
+        motionEffectsX.minimumRelativeValue = -offset
+
+        let motionEffectsY = UIInterpolatingMotionEffect(keyPath: "center.y", type: .tiltAlongVerticalAxis)
+        motionEffectsY.maximumRelativeValue = offset
+        motionEffectsY.minimumRelativeValue = -offset
+
+        let group = UIMotionEffectGroup()
+        group.motionEffects = [motionEffectsX, motionEffectsY]
+
+        addMotionEffect(group)
+    }
+
 }

PKHUD/HUD.swift

@@ -35,6 +35,11 @@ public final class HUD {
         set { PKHUD.sharedHUD.dimsBackground = newValue }
     }
 
+    public static var enableMottionEffects: Bool {
+        get { return PKHUD.sharedHUD.enableMotionEffects }
+        set { PKHUD.sharedHUD.enableMotionEffects = newValue }
+    }
+
     public static var allowsInteraction: Bool {
         get { return PKHUD.sharedHUD.userInteractionOnUnderlyingViewsEnabled  }
         set { PKHUD.sharedHUD.userInteractionOnUnderlyingViewsEnabled = newValue }

PKHUD/PKHUD.swift

@@ -95,6 +95,16 @@ open class PKHUD: NSObject {
         }
     }
 
+    open var enableMotionEffects: Bool {
+        get {
+            return !container.frameView.motionEffects.isEmpty
+        }
+
+        set {
+            container.frameView.updateMottionEffects(isEnable: newValue)
+        }
+    }
+
     open var isVisible: Bool {
         return !container.isHidden
     }