diff --git a/NativePopup.xcodeproj/project.pbxproj b/NativePopup.xcodeproj/project.pbxproj
index 694d79e..1a06ee2 100644
--- a/NativePopup.xcodeproj/project.pbxproj
+++ b/NativePopup.xcodeproj/project.pbxproj
@@ -17,6 +17,7 @@
 		FECA87D91EAC87B700D07CB1 /* NativePopup.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = FE85338B1EAC7C92004BB756 /* NativePopup.framework */; };
 		FECA87DA1EAC87B700D07CB1 /* NativePopup.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = FE85338B1EAC7C92004BB756 /* NativePopup.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
 		FECA87DF1EAC94B300D07CB1 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = FECA87DE1EAC94B300D07CB1 /* Assets.xcassets */; };
+		FECA87E11EACC77800D07CB1 /* NativePopup.extension.swift in Sources */ = {isa = PBXBuildFile; fileRef = FECA87E01EACC77800D07CB1 /* NativePopup.extension.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -56,6 +57,7 @@
 		FECA87C51EAC7CCF00D07CB1 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		FECA87D71EAC7D9E00D07CB1 /* NativePopup.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = NativePopup.swift; sourceTree = "<group>"; };
 		FECA87DE1EAC94B300D07CB1 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
+		FECA87E01EACC77800D07CB1 /* NativePopup.extension.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = NativePopup.extension.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -101,6 +103,7 @@
 				FE85338E1EAC7C92004BB756 /* NativePopup.h */,
 				FE85338F1EAC7C92004BB756 /* Info.plist */,
 				FECA87D71EAC7D9E00D07CB1 /* NativePopup.swift */,
+				FECA87E01EACC77800D07CB1 /* NativePopup.extension.swift */,
 				FECA87DE1EAC94B300D07CB1 /* Assets.xcassets */,
 			);
 			path = NativePopup;
@@ -236,6 +239,7 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				FECA87E11EACC77800D07CB1 /* NativePopup.extension.swift in Sources */,
 				FECA87D81EAC7D9E00D07CB1 /* NativePopup.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
diff --git a/NativePopup/NativePopup.extension.swift b/NativePopup/NativePopup.extension.swift
new file mode 100644
index 0000000..c31263f
--- /dev/null
+++ b/NativePopup/NativePopup.extension.swift
@@ -0,0 +1,41 @@
+//
+//  NativePopup.extension.swift
+//  NativePopup
+//
+//  Created by mono on 2017/04/23.
+//  Copyright © 2017 mono. All rights reserved.
+//
+
+import Foundation
+
+extension NativePopup {
+    public enum Image {
+        case
+        good,
+        bad,
+        custom(image: UIImage)
+
+        var image: UIImage {
+            switch self {
+            case .good: return type(of: self).createImage(named: "good")
+            case .bad: return type(of: self).createImage(named: "bad")
+            case .custom(let image): return image
+            }
+        }
+
+        private static func createImage(named: String) -> UIImage {
+            return UIImage.init(named: named, in: Bundle(for: NativePopup.self), compatibleWith: nil)!
+        }
+    }
+
+    public struct Info {
+        public let image: Image
+        public let title: String
+        public let message: String?
+        public init(image: Image, title: String, message: String?) {
+            self.image = image
+            self.title = title
+            self.message = message
+        }
+    }
+}
diff --git a/NativePopup/NativePopup.swift b/NativePopup/NativePopup.swift
index 63b0560..ba98720 100644
--- a/NativePopup/NativePopup.swift
+++ b/NativePopup/NativePopup.swift
@@ -9,42 +9,11 @@
 import Foundation
 import UIKit
 
-
 public class NativePopup: UIView {
 
     private static let keyWindow = UIApplication.shared.keyWindow!
     private weak static var currentView: NativePopup?
 
-    public enum Image {
-        case
-        good,
-        bad,
-        custom(image: UIImage)
-
-        fileprivate var image: UIImage {
-            switch self {
-            case .good: return type(of: self).createImage(named: "good")
-            case .bad: return type(of: self).createImage(named: "bad")
-            case .custom(let image): return image
-            }
-        }
-
-        private static func createImage(named: String) -> UIImage {
-            return UIImage.init(named: named, in: Bundle(for: NativePopup.self), compatibleWith: nil)!
-        }
-    }
-
-    public struct Info {
-        public let image: Image
-        public let title: String
-        public let message: String?
-        public init(image: Image, title: String, message: String?) {
-            self.image = image
-            self.title = title
-            self.message = message
-        }
-    }
-
     public static func show(info: Info) {
         let view = NativePopup(info: info)
         view.show()