diff --git a/Example/JellyAnimationView.xcodeproj/project.pbxproj b/Example/JellyAnimationView.xcodeproj/project.pbxproj
index c9a3217..aa134b2 100644
--- a/Example/JellyAnimationView.xcodeproj/project.pbxproj
+++ b/Example/JellyAnimationView.xcodeproj/project.pbxproj
@@ -12,6 +12,7 @@
 		607FACDD1AFB9204008FA782 /* Images.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 607FACDC1AFB9204008FA782 /* Images.xcassets */; };
 		607FACE01AFB9204008FA782 /* LaunchScreen.xib in Resources */ = {isa = PBXBuildFile; fileRef = 607FACDE1AFB9204008FA782 /* LaunchScreen.xib */; };
 		9C44F0C47E14B3ABF68D7D12 /* Pods_JellyAnimationView_Example.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = B392A0E110C38F48FFA4F7E6 /* Pods_JellyAnimationView_Example.framework */; };
+		ED727A461F739DC70068A182 /* ViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = ED727A451F739DC70068A182 /* ViewController.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
@@ -30,6 +31,7 @@
 		C041CE0516521808A0456310 /* Pods-JellyAnimationView_Example.debug.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-JellyAnimationView_Example.debug.xcconfig"; path = "Pods/Target Support Files/Pods-JellyAnimationView_Example/Pods-JellyAnimationView_Example.debug.xcconfig"; sourceTree = "<group>"; };
 		D1D710976E9922E774CE559A /* Pods-JellyAnimationView_Tests.release.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-JellyAnimationView_Tests.release.xcconfig"; path = "Pods/Target Support Files/Pods-JellyAnimationView_Tests/Pods-JellyAnimationView_Tests.release.xcconfig"; sourceTree = "<group>"; };
 		EB1CD7121E3AC59761741B1A /* Pods-JellyAnimationView_Tests.debug.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-JellyAnimationView_Tests.debug.xcconfig"; path = "Pods/Target Support Files/Pods-JellyAnimationView_Tests/Pods-JellyAnimationView_Tests.debug.xcconfig"; sourceTree = "<group>"; };
+		ED727A451F739DC70068A182 /* ViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ViewController.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -76,6 +78,7 @@
 			isa = PBXGroup;
 			children = (
 				607FACD51AFB9204008FA782 /* AppDelegate.swift */,
+				ED727A451F739DC70068A182 /* ViewController.swift */,
 				607FACD91AFB9204008FA782 /* Main.storyboard */,
 				607FACDC1AFB9204008FA782 /* Images.xcassets */,
 				607FACDE1AFB9204008FA782 /* LaunchScreen.xib */,
@@ -243,6 +246,7 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				ED727A461F739DC70068A182 /* ViewController.swift in Sources */,
 				607FACD61AFB9204008FA782 /* AppDelegate.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
diff --git a/Example/JellyAnimationView/Base.lproj/Main.storyboard b/Example/JellyAnimationView/Base.lproj/Main.storyboard
index 747efb3..3c9ca24 100644
--- a/Example/JellyAnimationView/Base.lproj/Main.storyboard
+++ b/Example/JellyAnimationView/Base.lproj/Main.storyboard
@@ -12,7 +12,7 @@
         <!--View Controller-->
         <scene sceneID="ufC-wZ-h7g">
             <objects>
-                <viewController id="vXZ-lx-hvc" sceneMemberID="viewController">
+                <viewController id="vXZ-lx-hvc" customClass="ViewController" customModule="JellyAnimationView_Example" customModuleProvider="target" sceneMemberID="viewController">
                     <layoutGuides>
                         <viewControllerLayoutGuide type="top" id="jyV-Pf-zRb"/>
                         <viewControllerLayoutGuide type="bottom" id="2fi-mo-0CV"/>
@@ -32,15 +32,45 @@
                                     <userDefinedRuntimeAttribute type="number" keyPath="jumpHeight">
                                         <real key="value" value="100"/>
                                     </userDefinedRuntimeAttribute>
+                                    <userDefinedRuntimeAttribute type="boolean" keyPath="startWhenAwakeFromNib" value="YES"/>
                                 </userDefinedRuntimeAttributes>
                             </view>
+                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="2vj-Mv-yFz">
+                                <rect key="frame" x="163.5" y="537" width="47" height="30"/>
+                                <state key="normal" title="Toggle"/>
+                                <connections>
+                                    <action selector="animationToggle:" destination="vXZ-lx-hvc" eventType="touchUpInside" id="tVa-fy-r9f"/>
+                                </connections>
+                            </button>
+                            <stackView opaque="NO" contentMode="scaleToFill" spacing="8" translatesAutoresizingMaskIntoConstraints="NO" id="non-oC-XbD">
+                                <rect key="frame" x="93.5" y="498" width="188" height="31"/>
+                                <subviews>
+                                    <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="stop immediately" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="8yK-Y8-Uym">
+                                        <rect key="frame" x="0.0" y="0.0" width="131" height="31"/>
+                                        <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" on="YES" translatesAutoresizingMaskIntoConstraints="NO" id="htd-Zq-UhS">
+                                        <rect key="frame" x="139" y="0.0" width="51" height="31"/>
+                                    </switch>
+                                </subviews>
+                            </stackView>
                         </subviews>
                         <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                         <constraints>
+                            <constraint firstItem="2fi-mo-0CV" firstAttribute="top" secondItem="2vj-Mv-yFz" secondAttribute="bottom" constant="100" id="6gl-oB-VJB"/>
+                            <constraint firstItem="non-oC-XbD" firstAttribute="centerX" secondItem="kh9-bI-dsS" secondAttribute="centerX" id="7kX-kp-dNt"/>
+                            <constraint firstItem="2vj-Mv-yFz" firstAttribute="centerX" secondItem="kh9-bI-dsS" secondAttribute="centerX" id="FmF-rJ-hDV"/>
                             <constraint firstItem="BA1-SM-q4u" firstAttribute="centerY" secondItem="kh9-bI-dsS" secondAttribute="centerY" id="R4S-4V-cfl"/>
+                            <constraint firstItem="2vj-Mv-yFz" firstAttribute="top" secondItem="non-oC-XbD" secondAttribute="bottom" constant="8" id="cmL-Of-Fxy"/>
                             <constraint firstItem="BA1-SM-q4u" firstAttribute="centerX" secondItem="kh9-bI-dsS" secondAttribute="centerX" id="ySY-dG-uWj"/>
                         </constraints>
                     </view>
+                    <connections>
+                        <outlet property="animationView" destination="BA1-SM-q4u" id="Dup-Py-Knp"/>
+                        <outlet property="immediatelySwitch" destination="htd-Zq-UhS" id="zms-kp-VdF"/>
+                    </connections>
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="x5A-6p-PRh" sceneMemberID="firstResponder"/>
             </objects>
diff --git a/Example/JellyAnimationView/ViewController.swift b/Example/JellyAnimationView/ViewController.swift
new file mode 100644
index 0000000..5025ebb
--- /dev/null
+++ b/Example/JellyAnimationView/ViewController.swift
@@ -0,0 +1,23 @@
+//
+//  ViewController.swift
+//  JellyAnimationView_Example
+//
+//  Created by Koji Murata on 2017/09/21.
+//  Copyright © 2017年 CocoaPods. All rights reserved.
+//
+
+import UIKit
+import JellyAnimationView
+
+final class ViewController: UIViewController {
+  @IBOutlet private weak var animationView: JellyAnimationView!
+  @IBOutlet private weak var immediatelySwitch: UISwitch!
+  
+  @IBAction private func animationToggle(_ sender: UIButton) {
+    if animationView.isAnimating {
+      animationView.stopAnimation(immediately: immediatelySwitch.isOn)
+    } else {
+      animationView.startAnimation()
+    }
+  }
+}
diff --git a/JellyAnimationView/Classes/JellyAnimationView.swift b/JellyAnimationView/Classes/JellyAnimationView.swift
index 93c3845..0949867 100644
--- a/JellyAnimationView/Classes/JellyAnimationView.swift
+++ b/JellyAnimationView/Classes/JellyAnimationView.swift
@@ -9,14 +9,28 @@ import UIKit
 
 open class JellyAnimationView: UIView, CAAnimationDelegate {
   open func startAnimation() {
+    isAnimating = true
+    immediately = false
     startVerticalAnimation()
   }
   
+  open func stopAnimation(immediately: Bool = false) {
+    isAnimating = false
+    self.immediately = immediately
+    if immediately {
+      layer.removeAllAnimations()
+    }
+  }
+  
   @IBInspectable open var startWhenAwakeFromNib: Bool = true
   @IBInspectable open var duration: Double = 1
   @IBInspectable open var jumpHeight: CGFloat = 20
   @IBInspectable open var initialVelocity: CGFloat = 1
   
+  open private(set) var isAnimating = false
+  
+  private var immediately = false
+  
   private func startJellyWidthAnimation() {
     let animation = CASpringAnimation(keyPath: "transform.scale.x")
     animation.duration = 1
@@ -26,6 +40,7 @@ open class JellyAnimationView: UIView, CAAnimationDelegate {
     animation.initialVelocity = jumpHeight * 100 * initialVelocity
     animation.damping = 14
     animation.stiffness = 300
+    animation.isRemovedOnCompletion = true
     layer.add(animation, forKey: nil)
   }
   
@@ -38,6 +53,7 @@ open class JellyAnimationView: UIView, CAAnimationDelegate {
     animation.initialVelocity = jumpHeight * 100 * initialVelocity
     animation.damping = 10
     animation.stiffness = 300
+    animation.isRemovedOnCompletion = true
     layer.add(animation, forKey: nil)
   }
   
@@ -60,13 +76,20 @@ open class JellyAnimationView: UIView, CAAnimationDelegate {
     verticalAnimation.keyTimes = keyTimes
     verticalAnimation.values = values
     verticalAnimation.delegate = self
+    verticalAnimation.isRemovedOnCompletion = true
     
     layer.add(verticalAnimation, forKey: nil)
   }
   
   open func animationDidStop(_ anim: CAAnimation, finished flag: Bool) {
-    startJellyAnimation()
-    startVerticalAnimation()
+    if isAnimating {
+      startJellyAnimation()
+      startVerticalAnimation()
+    } else {
+      if !immediately {
+        startJellyAnimation()
+      }
+    }
   }
   
   override open func awakeFromNib() {