diff --git a/RxKeyboard.podspec b/RxKeyboard.podspec
index 6a20a01..73afad4 100644
--- a/RxKeyboard.podspec
+++ b/RxKeyboard.podspec
@@ -7,13 +7,20 @@ Pod::Spec.new do |s|
   s.author           = { 'Suyeol Jeon' => 'devxoul@gmail.com' }
   s.source           = { :git => 'https://github.com/RxSwiftCommunity/RxKeyboard.git',
                          :tag => s.version.to_s }
-  s.source_files     = 'Sources/*.swift'
   s.frameworks       = 'UIKit', 'Foundation'
   s.requires_arc     = true
 
   s.dependency 'RxSwift', '>= 3.0'
   s.dependency 'RxCocoa', '>= 3.0'
 
+  s.subspec 'Core' do |core|
+    core.source_files = 'Sources/RxKeyboard.swift'
+  end
+
+  s.subspec 'Interactive' do |interactive|
+    interactive.source_files = 'Sources/RxKeyboardInteractive.swift'
+  end
+
   s.ios.deployment_target = '8.0'
 
   s.pod_target_xcconfig = {
diff --git a/RxKeyboard.xcodeproj/project.pbxproj b/RxKeyboard.xcodeproj/project.pbxproj
index 4145ca3..d232c8e 100644
--- a/RxKeyboard.xcodeproj/project.pbxproj
+++ b/RxKeyboard.xcodeproj/project.pbxproj
@@ -11,6 +11,7 @@
 		0310C6771DA9535200BDA512 /* RxKeyboard.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0310C6761DA9535200BDA512 /* RxKeyboard.swift */; };
 		03CE448E1E35AAE5006DD6E9 /* RxCocoa.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 034E7CA31DAD548900CFC398 /* RxCocoa.framework */; };
 		03CE448F1E35AAE5006DD6E9 /* RxSwift.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 034E7CA41DAD548900CFC398 /* RxSwift.framework */; };
+		407629F61EB906710051197B /* RxKeyboardInteractive.swift in Sources */ = {isa = PBXBuildFile; fileRef = 407629F51EB906710051197B /* RxKeyboardInteractive.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
@@ -22,6 +23,7 @@
 		034E7CA41DAD548900CFC398 /* RxSwift.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = RxSwift.framework; path = Carthage/Build/iOS/RxSwift.framework; sourceTree = "<group>"; };
 		034E7CA51DAD548900CFC398 /* RxTests.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = RxTests.framework; path = Carthage/Build/iOS/RxTests.framework; sourceTree = "<group>"; };
 		03A258CB1DA94EC50035A85B /* RxKeyboard.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = RxKeyboard.framework; sourceTree = BUILT_PRODUCTS_DIR; };
+		407629F51EB906710051197B /* RxKeyboardInteractive.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = RxKeyboardInteractive.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -42,6 +44,7 @@
 			children = (
 				0310C6711DA9525200BDA512 /* RxKeyboard.h */,
 				0310C6761DA9535200BDA512 /* RxKeyboard.swift */,
+				407629F51EB906710051197B /* RxKeyboardInteractive.swift */,
 			);
 			path = Sources;
 			sourceTree = "<group>";
@@ -167,6 +170,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				0310C6771DA9535200BDA512 /* RxKeyboard.swift in Sources */,
+				407629F61EB906710051197B /* RxKeyboardInteractive.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
diff --git a/Sources/RxKeyboard.swift b/Sources/RxKeyboard.swift
index ff16d85..50941c6 100644
--- a/Sources/RxKeyboard.swift
+++ b/Sources/RxKeyboard.swift
@@ -30,11 +30,10 @@ public class RxKeyboard: NSObject {
   /// useful when adjusting scroll view content offset.
   public let willShowVisibleHeight: Driver<CGFloat>
 
+  // MARK: Internal
 
-  // MARK: Private
-
-  fileprivate let disposeBag = DisposeBag()
-  fileprivate let panRecognizer = UIPanGestureRecognizer()
+  internal let disposeBag = DisposeBag()
+  internal let panRecognizer = UIPanGestureRecognizer()
 
 
   // MARK: Initializing
@@ -93,7 +92,7 @@ public class RxKeyboard: NSObject {
       .withLatestFrom(frameVariable.asObservable()) { ($0, $1) }
       .flatMap { (gestureRecognizer, frame) -> Observable<CGRect> in
         guard case .changed = gestureRecognizer.state,
-          let window = UIApplication.shared.windows.first,
+          let window = gestureRecognizer.view,
           frame.origin.y < UIScreen.main.bounds.height
         else { return .empty() }
         let origin = gestureRecognizer.location(in: window)
@@ -109,13 +108,7 @@ public class RxKeyboard: NSObject {
 
     // gesture recognizer
     self.panRecognizer.delegate = self
-    NotificationCenter.default.rx.notification(.UIApplicationDidFinishLaunching)
-      .map { _ in Void() }
-      .startWith(Void()) // when RxKeyboard is initialized before UIApplication.window is created
-      .subscribe(onNext: { _ in
-        UIApplication.shared.windows.first?.addGestureRecognizer(self.panRecognizer)
-      })
-      .addDisposableTo(self.disposeBag)
+    self.attachPanRecognizer()
   }
 
 }
@@ -149,3 +142,21 @@ extension RxKeyboard: UIGestureRecognizerDelegate {
   }
 
 }
+
+// MARK: - Interactive
+
+internal protocol RxKeyboardInteractive {
+
+  var panRecognizer: UIPanGestureRecognizer { get }
+  var disposeBag: DisposeBag { get }
+  func attachPanRecognizer()
+
+}
+
+internal extension RxKeyboardInteractive {
+
+  func attachPanRecognizer() {}
+
+}
+
+extension RxKeyboard: RxKeyboardInteractive {}
diff --git a/Sources/RxKeyboardInteractive.swift b/Sources/RxKeyboardInteractive.swift
new file mode 100644
index 0000000..b7eff49
--- /dev/null
+++ b/Sources/RxKeyboardInteractive.swift
@@ -0,0 +1,24 @@
+//
+//  RxKeyboardInteractive.swift
+//  RxKeyboard
+//
+//  Created by Ian Ynda-Hummel on 5/2/17.
+//  Copyright © 2017 Suyeol Jeon. All rights reserved.
+//
+
+import UIKit
+
+import RxCocoa
+import RxSwift
+
+internal extension RxKeyboard {
+  internal func attachPanRecognizer() {
+    NotificationCenter.default.rx.notification(.UIApplicationDidFinishLaunching)
+      .map { _ in Void() }
+      .startWith(Void()) // when RxKeyboard is initialized before UIApplication.window is created
+      .subscribe(onNext: { _ in
+        UIApplication.shared.windows.first?.addGestureRecognizer(self.panRecognizer)
+      })
+      .addDisposableTo(self.disposeBag)
+  }
+}