diff --git a/Demo/Demo/Main.storyboard b/Demo/Demo/Main.storyboard
index 5382385..81ac707 100644
--- a/Demo/Demo/Main.storyboard
+++ b/Demo/Demo/Main.storyboard
@@ -583,20 +583,20 @@
                                         </tableViewCellContentView>
                                     </tableViewCell>
                                     <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" preservesSuperviewLayoutMargins="YES" selectionStyle="default" indentationWidth="10" id="e3t-lO-LwR">
-                                        <rect key="frame" x="20" y="448.00000953674316" width="374" height="43.666667938232422"/>
+                                        <rect key="frame" x="20" y="448.00000953674316" width="374" height="44"/>
                                         <autoresizingMask key="autoresizingMask"/>
                                         <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" preservesSuperviewLayoutMargins="YES" insetsLayoutMarginsFromSafeArea="NO" tableViewCell="e3t-lO-LwR" id="Ljd-zn-wdH">
-                                            <rect key="frame" x="0.0" y="0.0" width="374" height="43.666667938232422"/>
+                                            <rect key="frame" x="0.0" y="0.0" width="374" height="44"/>
                                             <autoresizingMask key="autoresizingMask"/>
                                             <subviews>
                                                 <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Background Color" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="4Op-pm-K77">
-                                                    <rect key="frame" x="25" y="11.666666666666666" width="137" height="20.333333333333336"/>
+                                                    <rect key="frame" x="25" y="11.999999999999998" width="137" height="20.333333333333329"/>
                                                     <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                                     <nil key="textColor"/>
                                                     <nil key="highlightedColor"/>
                                                 </label>
                                                 <switch opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" translatesAutoresizingMaskIntoConstraints="NO" id="TPa-cd-hV9">
-                                                    <rect key="frame" x="300" y="6.3333333333333321" width="51" height="30.999999999999996"/>
+                                                    <rect key="frame" x="300" y="6.6666666666666679" width="51" height="31.000000000000004"/>
                                                     <connections>
                                                         <action selector="backgroundColorToggled:" destination="yZL-Zz-aEt" eventType="valueChanged" id="fz9-oQ-vsN"/>
                                                     </connections>
@@ -611,13 +611,13 @@
                                         </tableViewCellContentView>
                                     </tableViewCell>
                                     <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" preservesSuperviewLayoutMargins="YES" selectionStyle="default" indentationWidth="10" id="Le2-0X-9GZ">
-                                        <rect key="frame" x="20" y="491.66667747497559" width="374" height="43.666667938232422"/>
+                                        <rect key="frame" x="20" y="492.00000953674316" width="374" height="43.666667938232422"/>
                                         <autoresizingMask key="autoresizingMask"/>
                                         <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" preservesSuperviewLayoutMargins="YES" insetsLayoutMarginsFromSafeArea="NO" tableViewCell="Le2-0X-9GZ" id="GoU-jB-eIa">
                                             <rect key="frame" x="0.0" y="0.0" width="374" height="43.666667938232422"/>
                                             <autoresizingMask key="autoresizingMask"/>
                                             <subviews>
-                                                <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="ECp-dX-4cT">
+                                                <button opaque="NO" contentMode="scaleToFill" ambiguous="YES" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="ECp-dX-4cT">
                                                     <rect key="frame" x="131" y="7" width="112" height="30"/>
                                                     <constraints>
                                                         <constraint firstAttribute="height" constant="30" id="uhL-b2-bHv"/>
diff --git a/Source/APNGKit/APNGImageView.swift b/Source/APNGKit/APNGImageView.swift
index d90449e..688793f 100644
--- a/Source/APNGKit/APNGImageView.swift
+++ b/Source/APNGKit/APNGImageView.swift
@@ -20,7 +20,7 @@ open class APNGImageView: PlatformView {
     
     public typealias PlayedLoopCount = Int
     public typealias FrameIndex = Int
-    
+        
     /// Whether the animation should be played automatically when a valid `APNGImage` is set to the `image` property
     /// of `self`. Default is `true`.
     open var autoStartAnimationWhenSetImage = true
@@ -64,9 +64,9 @@ open class APNGImageView: PlatformView {
     /// `DisplayTimer` is used. On platforms that `CADisplayLink` is not available, a normal `Foundation.Timer` based
     /// one is used.
     #if canImport(UIKit)
-    public var DrivingTimerType: DrivingTimer.Type { NormalTimer.self }
+    open var DrivingTimerType: DrivingTimer.Type { NormalTimer.self }
     #else
-    public var DrivingTimerType: DrivingTimer.Type { NormalTimer.self }
+    open var DrivingTimerType: DrivingTimer.Type { NormalTimer.self }
     #endif
     
     // When the current frame was started to be displayed on the screen. It is the base time to calculate the current