diff --git a/APNSUtil.podspec b/APNSUtil.podspec
index 0d68d71..e534289 100644
--- a/APNSUtil.podspec
+++ b/APNSUtil.podspec
@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = 'APNSUtil'
-  s.version          = '1.1.4'
+  s.version          = '1.1.5'
   s.summary          = 'APNSUtil is makes code simple using apple push notification service.'
   s.description      = 'APNSUtil is makes code simple using apple push notification service.'
   s.homepage         = 'https://github.com/pisces/APNSUtil'
@@ -16,15 +16,6 @@ Pod::Spec.new do |s|
   s.author           = { 'pisces' => 'hh963103@gmail.com' }
   s.source           = { :git => 'https://github.com/pisces/APNSUtil.git', :tag => s.version.to_s }
   s.ios.deployment_target = '9.0'
+  s.source_files = 'APNSUtil/Classes/**/*'
   s.dependency 'ObjectMapper', '~> 3.1'
-  s.default_subspec = 'Core'
-
-  s.subspec 'Core' do |core|
-    core.source_files = 'APNSUtil/Classes/**/*'
-  end
-
-  s.subspec 'AppExtension' do |ext|
-    ext.source_files = 'APNSUtil/Classes/**/*'
-    ext.pod_target_xcconfig = { 'OTHER_SWIFT_FLAGS' => '-DAPP_EXTENSIONS' }
-  end
 end
diff --git a/APNSUtil/Classes/NSObject+Codable.swift b/APNSUtil/Classes/NSObject+Codable.swift
index 90b4a62..52b6408 100644
--- a/APNSUtil/Classes/NSObject+Codable.swift
+++ b/APNSUtil/Classes/NSObject+Codable.swift
@@ -9,23 +9,66 @@
 import Foundation
 
 extension NSObject {
+    
+    // MARK: - Properties
+    
     public var mirrorChildList: [Mirror.Child] {
         return Mirror(reflecting: self).children.filter { $0.label != nil }
     }
     
+    // MARK: - Public methods
+    
     public func encodeProperties(with corder: NSCoder, ignoreKeys: [String]? = nil) {
-        mirrorChildList.forEach {
+        let mirror = Mirror(reflecting: self)
+        var current = mirror.superclassMirror
+        
+        while current != nil {
+            encodeChildren(filteredChildren(current), corder: corder, ignoreKeys: ignoreKeys)
+            current = current?.superclassMirror
+        }
+        
+        encodeChildren(filteredChildren(mirror), corder: corder, ignoreKeys: ignoreKeys)
+    }
+    public func decodeProperties(with corder: NSCoder, ignoreKeys: [String]? = nil) {
+        let mirror = Mirror(reflecting: self)
+        var current = mirror.superclassMirror
+        
+        while current != nil {
+            decodeChildren(filteredChildren(current), corder: corder, ignoreKeys: ignoreKeys)
+            current = current?.superclassMirror
+        }
+        
+        decodeChildren(filteredChildren(mirror), corder: corder, ignoreKeys: ignoreKeys)
+    }
+    public func dictionary(ignoreKeys: [String]? = nil) -> [String: Any] {
+        let mirror = Mirror(reflecting: self)
+        var current = mirror.superclassMirror
+        var dict = [String: Any]()
+        
+        while current != nil {
+            setValue(with: filteredChildren(current), dict: &dict, ignoreKeys: ignoreKeys)
+            current = current?.superclassMirror
+        }
+        
+        setValue(with: filteredChildren(mirror), dict: &dict, ignoreKeys: ignoreKeys)
+        
+        return dict
+    }
+    
+    // MARK: - Private methods
+    
+    private func encodeChildren(_ children: [Mirror.Child]?, corder: NSCoder, ignoreKeys: [String]? = nil) {
+        children?.forEach {
             if let ignoreKeys = ignoreKeys, ignoreKeys.contains($0.label!) {
                 return
             }
-            
             if !($0.value is NSNull) {
                 corder.encode($0.value, forKey: $0.label!)
             }
         }
     }
-    public func decodeProperties(with corder: NSCoder, ignoreKeys: [String]? = nil) {
-        mirrorChildList.forEach {
+    private func decodeChildren(_ children: [Mirror.Child]?, corder: NSCoder, ignoreKeys: [String]? = nil) {
+        children?.forEach {
             if let ignoreKeys = ignoreKeys, ignoreKeys.contains($0.label!) {
                 return
             }
@@ -34,14 +77,15 @@ extension NSObject {
             }
         }
     }
-    public func dictionary(ignoreKeys: [String]? = nil) -> [String: Any] {
-        var dict = [String: Any]()
-        mirrorChildList.forEach {
+    private func filteredChildren(_ mirror: Mirror?) -> [Mirror.Child] {
+        return mirror?.children.filter { $0.label != nil } ?? []
+    }
+    private func setValue(with children: [Mirror.Child]?, dict: inout [String: Any], ignoreKeys: [String]? = nil) {
+        children?.forEach {
             if let ignoreKeys = ignoreKeys, ignoreKeys.contains($0.label!) {
                 return
             }
             dict[$0.label!] = value(forKey: $0.label!)
         }
-        return dict
     }
 }
diff --git a/APNSUtilAppExtension.podspec b/APNSUtilAppExtension.podspec
new file mode 100644
index 0000000..d756ed6
--- /dev/null
+++ b/APNSUtilAppExtension.podspec
@@ -0,0 +1,22 @@
+#
+# Be sure to run `pod lib lint APNSUtil.podspec' to ensure this is a
+# valid spec before submitting.
+#
+# Any lines starting with a # are optional, but their use is encouraged
+# To learn more about a Podspec see http://guides.cocoapods.org/syntax/podspec.html
+#
+
+Pod::Spec.new do |s|
+  s.name             = 'APNSUtilAppExtension'
+  s.version          = '1.1.5'
+  s.summary          = 'APNSUtil is makes code simple using apple push notification service.'
+  s.description      = 'APNSUtil is makes code simple using apple push notification service.'
+  s.homepage         = 'https://github.com/pisces/APNSUtil'
+  s.license          = { :type => 'MIT', :file => 'LICENSE' }
+  s.author           = { 'pisces' => 'hh963103@gmail.com' }
+  s.source           = { :git => 'https://github.com/pisces/APNSUtil.git', :tag => s.version.to_s }
+  s.ios.deployment_target = '9.0'
+  s.source_files = 'APNSUtil/Classes/**/*'
+  s.dependency 'ObjectMapper', '~> 3.1'
+  s.pod_target_xcconfig = { 'OTHER_SWIFT_FLAGS' => '-DAPP_EXTENSIONS' }
+end
diff --git a/README.md b/README.md
index 52f0ce8..ee91212 100644
--- a/README.md
+++ b/README.md
@@ -131,7 +131,7 @@ struct APNSPayload: Mappable {
 $ gem install cocoapods
 ```
 
-> CocoaPods 1.1.2+ is required to build APNSUtil 1.0.0+.
+> CocoaPods 1.0.0+ is required to build APNSUtil 1.1.5+.
 
 To integrate APNSUtil into your Xcode project using CocoaPods, specify it in your `Podfile`:
 
@@ -141,12 +141,12 @@ platform :ios, '9.0'
 
 # Default
 target '<Your Target Name>' do
-    pod 'APNSUtil', '~> 1.1.4'
+    pod 'APNSUtil', '~> 1.1.5'
 end
 
 # for AppExtension
 target '<Your Target Name>' do
-    pod 'APNSUtil/AppExtension', '~> 1.1.4'
+    pod 'APNSUtil/AppExtension', '~> 1.1.5'
 end
 ```
 
@@ -170,7 +170,7 @@ $ brew install carthage
 To integrate Alamofire into your Xcode project using Carthage, specify it in your `Cartfile`:
 
 ```ogdl
-github "pisces/APNSUtil" ~> 1.1.4
+github "pisces/APNSUtil" ~> 1.1.5
 ```
 
 Run `carthage update` to build the framework and drag the built `APNSUtil.framework` into your Xcode project.