diff --git a/.gitignore b/.gitignore
index 68d634b..bf38de5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,6 +16,7 @@ DerivedData/
 *.perspectivev3
 !default.perspectivev3
 xcuserdata/
+*.xcworkspace/xcshareddata/
 
 ## Other
 *.moved-aside
@@ -43,6 +44,7 @@ playground.xcworkspace
 # you should judge for yourself, the pros and cons are mentioned at:
 # https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
 Pods/
+Podfile.lock
 
 # Carthage
 #
diff --git a/IBLocalizable.xcodeproj/project.pbxproj b/IBLocalizable.xcodeproj/project.pbxproj
index 1f6bc4e..25a6af6 100644
--- a/IBLocalizable.xcodeproj/project.pbxproj
+++ b/IBLocalizable.xcodeproj/project.pbxproj
@@ -8,7 +8,8 @@
 
 /* Begin PBXBuildFile section */
 		12FE1D52234EE35D04F685C5 /* Pods_IBLocalizableTests.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 18E57D0DFB64AFC5E2BF5972 /* Pods_IBLocalizableTests.framework */; };
-		3F3E660B364715C25B177B1E /* Pods_IBLocalizable_IBLocalizableTests.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 502240D749CBE7AEA0186132 /* Pods_IBLocalizable_IBLocalizableTests.framework */; };
+		775E3F2622E73239001E10D1 /* LocalizableBundle.swift in Sources */ = {isa = PBXBuildFile; fileRef = 775E3F2522E73239001E10D1 /* LocalizableBundle.swift */; };
+		775E3F2722E7344C001E10D1 /* LocalizableBundle.swift in Sources */ = {isa = PBXBuildFile; fileRef = 775E3F2522E73239001E10D1 /* LocalizableBundle.swift */; };
 		837CE40D1D4C50B000EC3FDA /* IBLocalizable.h in Headers */ = {isa = PBXBuildFile; fileRef = 837CE40C1D4C50B000EC3FDA /* IBLocalizable.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		837CE4141D4C50B000EC3FDA /* IBLocalizable.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 837CE4091D4C50B000EC3FDA /* IBLocalizable.framework */; };
 		837CE4191D4C50B000EC3FDA /* IBLocalizableTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 837CE4181D4C50B000EC3FDA /* IBLocalizableTests.swift */; };
@@ -68,7 +69,8 @@
 
 /* Begin PBXFileReference section */
 		18E57D0DFB64AFC5E2BF5972 /* Pods_IBLocalizableTests.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = Pods_IBLocalizableTests.framework; sourceTree = BUILT_PRODUCTS_DIR; };
-		502240D749CBE7AEA0186132 /* Pods_IBLocalizable_IBLocalizableTests.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = Pods_IBLocalizable_IBLocalizableTests.framework; sourceTree = BUILT_PRODUCTS_DIR; };
+		775E3F2522E73239001E10D1 /* LocalizableBundle.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LocalizableBundle.swift; sourceTree = "<group>"; };
+		775E3F2922E73A55001E10D1 /* zh-Hans */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = "zh-Hans"; path = "zh-Hans.lproj/Localizable.strings"; sourceTree = "<group>"; };
 		7DB3A6272F8564DCE6E70E95 /* Pods-IBLocalizable-IBLocalizableTests.debug.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-IBLocalizable-IBLocalizableTests.debug.xcconfig"; path = "Pods/Target Support Files/Pods-IBLocalizable-IBLocalizableTests/Pods-IBLocalizable-IBLocalizableTests.debug.xcconfig"; sourceTree = "<group>"; };
 		7E0BE6815070F406CEEEB031 /* Pods-IBLocalizableTests.debug.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-IBLocalizableTests.debug.xcconfig"; path = "Pods/Target Support Files/Pods-IBLocalizableTests/Pods-IBLocalizableTests.debug.xcconfig"; sourceTree = "<group>"; };
 		837CE4091D4C50B000EC3FDA /* IBLocalizable.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = IBLocalizable.framework; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -123,7 +125,6 @@
 			files = (
 				837CE4141D4C50B000EC3FDA /* IBLocalizable.framework in Frameworks */,
 				12FE1D52234EE35D04F685C5 /* Pods_IBLocalizableTests.framework in Frameworks */,
-				3F3E660B364715C25B177B1E /* Pods_IBLocalizable_IBLocalizableTests.framework in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -222,6 +223,7 @@
 			isa = PBXGroup;
 			children = (
 				837CE42A1D4C59AE00EC3FDA /* LocalizableString.swift */,
+				775E3F2522E73239001E10D1 /* LocalizableBundle.swift */,
 			);
 			path = Utils;
 			sourceTree = "<group>";
@@ -272,7 +274,6 @@
 				CD70F902DBFC560BB4220321 /* Pods_IBLocalizable.framework */,
 				A9C08F5D259378924E88B96E /* Pods_IBLocalizableSample.framework */,
 				18E57D0DFB64AFC5E2BF5972 /* Pods_IBLocalizableTests.framework */,
-				502240D749CBE7AEA0186132 /* Pods_IBLocalizable_IBLocalizableTests.framework */,
 			);
 			name = Frameworks;
 			sourceTree = "<group>";
@@ -382,9 +383,11 @@
 			developmentRegion = English;
 			hasScannedForEncodings = 0;
 			knownRegions = (
+				English,
 				en,
 				Base,
 				es,
+				"zh-Hans",
 			);
 			mainGroup = 837CE3FF1D4C50B000EC3FDA;
 			productRefGroup = 837CE40A1D4C50B000EC3FDA /* Products */;
@@ -455,23 +458,19 @@
 			buildActionMask = 2147483647;
 			files = (
 			);
-			inputFileListPaths = (
-			);
 			inputPaths = (
-				"${SRCROOT}/Pods/Target Support Files/Pods-IBLocalizableTests/Pods-IBLocalizableTests-frameworks.sh",
+				"${PODS_ROOT}/Target Support Files/Pods-IBLocalizableTests/Pods-IBLocalizableTests-frameworks.sh",
 				"${BUILT_PRODUCTS_DIR}/Nimble/Nimble.framework",
 				"${BUILT_PRODUCTS_DIR}/Quick/Quick.framework",
 			);
 			name = "[CP] Embed Pods Frameworks";
-			outputFileListPaths = (
-			);
 			outputPaths = (
 				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/Nimble.framework",
 				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/Quick.framework",
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "\"${SRCROOT}/Pods/Target Support Files/Pods-IBLocalizableTests/Pods-IBLocalizableTests-frameworks.sh\"\n";
+			shellScript = "\"${PODS_ROOT}/Target Support Files/Pods-IBLocalizableTests/Pods-IBLocalizableTests-frameworks.sh\"\n";
 			showEnvVarsInLog = 0;
 		};
 /* End PBXShellScriptBuildPhase section */
@@ -482,6 +481,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				837CE4521D4C684600EC3FDA /* LocalizableButton.swift in Sources */,
+				775E3F2622E73239001E10D1 /* LocalizableBundle.swift in Sources */,
 				837CE44F1D4C5F0D00EC3FDA /* LocalizableLabel.swift in Sources */,
 				837CE45B1D4C73FA00EC3FDA /* LocalizableTextField.swift in Sources */,
 				837CE42B1D4C59AE00EC3FDA /* LocalizableString.swift in Sources */,
@@ -511,6 +511,7 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				775E3F2722E7344C001E10D1 /* LocalizableBundle.swift in Sources */,
 				837CE45F1D4C74D400EC3FDA /* LocalizableTextView.swift in Sources */,
 				837CE4531D4C684600EC3FDA /* LocalizableButton.swift in Sources */,
 				837CE4501D4C5F0D00EC3FDA /* LocalizableLabel.swift in Sources */,
@@ -566,6 +567,7 @@
 				837CE44C1D4C5D3F00EC3FDA /* Base */,
 				837CE4BF1D4DA00200EC3FDA /* es */,
 				CE53E3ED1EE1B06E003BC690 /* en */,
+				775E3F2922E73A55001E10D1 /* zh-Hans */,
 			);
 			name = Localizable.strings;
 			path = .;
diff --git a/IBLocalizable/Utils/LocalizableBundle.swift b/IBLocalizable/Utils/LocalizableBundle.swift
new file mode 100644
index 0000000..8170b78
--- /dev/null
+++ b/IBLocalizable/Utils/LocalizableBundle.swift
@@ -0,0 +1,57 @@
+//
+//  LocalizableBundle.swift
+//  IBLocalizable
+//
+//  Created by Layman on 2019/7/23.
+//  Copyright © 2019 Chris Jimenez. All rights reserved.
+//
+
+import Foundation
+
+fileprivate let LANG_KEY = "iblocalizable:custom:language"
+
+extension Bundle {
+    
+    struct Holder {
+        static var _custom: Bundle?
+    }
+    
+    open class var customBundle: Bundle {
+        get {
+            if let custom = Holder._custom {
+                return custom
+            }
+            guard let custom = Bundle.languageBundle() else {
+                Holder._custom = Bundle.main
+                return Bundle.main
+            }
+            Holder._custom = custom
+            return custom
+        }
+    }
+    
+    public class func languageBundle() -> Bundle? {
+        guard let customLanguage = UserDefaults.standard.string(forKey: LANG_KEY) else {
+            return nil
+        }
+        let languageBundlePath = Bundle.main.path(forResource: customLanguage, ofType: "lproj")
+//        print("path = \(String(describing: languageBundlePath))")
+        guard let customPath = languageBundlePath else {
+            return nil
+        }
+        return Bundle(path: customPath)
+    }
+    
+    public class func setCustomLanguage(_ language: String?) {
+        if let lang = language {
+            UserDefaults.standard.set(lang, forKey: LANG_KEY)
+        } else {
+            UserDefaults.standard.removeObject(forKey: LANG_KEY)
+        }
+        Holder._custom = nil
+    }
+    
+    public class func getCustomLanguage() -> String? {
+        return UserDefaults.standard.string(forKey: LANG_KEY)
+    }
+}
diff --git a/IBLocalizable/Utils/LocalizableString.swift b/IBLocalizable/Utils/LocalizableString.swift
index 07bea4d..daa9f71 100644
--- a/IBLocalizable/Utils/LocalizableString.swift
+++ b/IBLocalizable/Utils/LocalizableString.swift
@@ -13,7 +13,11 @@ extension String {
 
     /// Returns the localized string value
     public var localized: String {
-        return localize(withBundle: Bundle.main)
+        return localize(withBundle: Bundle.customBundle)
+    }
+    
+    public func localized(_ param: Any, withBundle bundle: Bundle = Bundle.customBundle) -> String{
+        return String(format: NSLocalizedString(self, tableName: nil, bundle: bundle, value: "", comment: ""), "\(param)")
     }
     
     public func localize(withBundle bundle: Bundle) -> String
diff --git a/IBLocalizableSample/AppDelegate.swift b/IBLocalizableSample/AppDelegate.swift
index 11c2a5d..d741c39 100644
--- a/IBLocalizableSample/AppDelegate.swift
+++ b/IBLocalizableSample/AppDelegate.swift
@@ -13,9 +13,9 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
 
     var window: UIWindow?
 
-
-    private func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: Any]?) -> Bool {
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
         // Override point for customization after application launch.
+//        Bundle.setCustomLanguage("zh-Hans")
         return true
     }
 
@@ -35,6 +35,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
 
     func applicationDidBecomeActive(_ application: UIApplication) {
         // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
+        print("world %@".localized(2))
     }
 
     func applicationWillTerminate(_ application: UIApplication) {
diff --git a/IBLocalizableSample/Base.lproj/Localizable.strings b/IBLocalizableSample/Base.lproj/Localizable.strings
index f2d9d97..c471280 100644
--- a/IBLocalizableSample/Base.lproj/Localizable.strings
+++ b/IBLocalizableSample/Base.lproj/Localizable.strings
@@ -14,3 +14,4 @@
 "more" = "More";
 "main" = "Main";
 "hello" = "Hello";
+"world %@" = "%@ worlds";
diff --git a/IBLocalizableSample/Base.lproj/Main.storyboard b/IBLocalizableSample/Base.lproj/Main.storyboard
index e45bbd1..a4c1110 100644
--- a/IBLocalizableSample/Base.lproj/Main.storyboard
+++ b/IBLocalizableSample/Base.lproj/Main.storyboard
@@ -1,12 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="12120" systemVersion="16B2657" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="WJc-Oc-WAO">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14490.70" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="WJc-Oc-WAO">
     <device id="retina4_7" orientation="portrait">
         <adaptation id="fullscreen"/>
     </device>
     <dependencies>
         <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="12088"/>
-        <capability name="Constraints to layout margins" minToolsVersion="6.0"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14490.49"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <scenes>
@@ -23,14 +22,14 @@
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <imageView userInteractionEnabled="NO" contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="IBLocalizable" translatesAutoresizingMaskIntoConstraints="NO" id="Qgy-Nb-c9J">
-                                <rect key="frame" x="65" y="59" width="245" height="131"/>
+                                <rect key="frame" x="65" y="79" width="245" height="131"/>
                                 <constraints>
                                     <constraint firstAttribute="width" constant="245" id="e1X-5B-eOK"/>
                                     <constraint firstAttribute="height" constant="131" id="uyB-Zj-gw4"/>
                                 </constraints>
                             </imageView>
                             <navigationBar contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="K2W-Qp-fEZ">
-                                <rect key="frame" x="0.0" y="0.0" width="375" height="44"/>
+                                <rect key="frame" x="0.0" y="20" width="375" height="44"/>
                                 <constraints>
                                     <constraint firstAttribute="height" constant="44" id="7mo-71-jxL"/>
                                 </constraints>
@@ -42,6 +41,14 @@
                                                 <userDefinedRuntimeAttribute type="string" keyPath="localizableString" value="log out"/>
                                             </userDefinedRuntimeAttributes>
                                         </barButtonItem>
+                                        <barButtonItem key="rightBarButtonItem" title="Item" id="QjA-Xd-4at">
+                                            <userDefinedRuntimeAttributes>
+                                                <userDefinedRuntimeAttribute type="string" keyPath="localizableString" value="switch language"/>
+                                            </userDefinedRuntimeAttributes>
+                                            <connections>
+                                                <action selector="switchLanguage:" destination="WJc-Oc-WAO" id="Zc1-KY-5GY"/>
+                                            </connections>
+                                        </barButtonItem>
                                         <userDefinedRuntimeAttributes>
                                             <userDefinedRuntimeAttribute type="string" keyPath="localizableString" value="sign in"/>
                                         </userDefinedRuntimeAttributes>
@@ -49,7 +56,7 @@
                                 </items>
                             </navigationBar>
                             <textField opaque="NO" clipsSubviews="YES" contentMode="scaleToFill" contentHorizontalAlignment="left" contentVerticalAlignment="center" borderStyle="roundedRect" placeholder="Email" textAlignment="natural" minimumFontSize="17" translatesAutoresizingMaskIntoConstraints="NO" id="N2M-V2-C45">
-                                <rect key="frame" x="39" y="219" width="298" height="30"/>
+                                <rect key="frame" x="32" y="239" width="311" height="30"/>
                                 <color key="backgroundColor" red="0.95605639180000002" green="0.95605639180000002" blue="0.95605639180000002" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                 <constraints>
                                     <constraint firstAttribute="height" constant="30" id="nHC-Qo-S5s"/>
@@ -61,7 +68,7 @@
                                 </userDefinedRuntimeAttributes>
                             </textField>
                             <textField opaque="NO" clipsSubviews="YES" contentMode="scaleToFill" contentHorizontalAlignment="left" contentVerticalAlignment="center" borderStyle="roundedRect" placeholder="Password" textAlignment="natural" minimumFontSize="17" translatesAutoresizingMaskIntoConstraints="NO" id="Scc-Vp-xlR">
-                                <rect key="frame" x="39" y="268" width="298" height="30"/>
+                                <rect key="frame" x="32" y="288" width="311" height="30"/>
                                 <color key="backgroundColor" red="0.95605639180000002" green="0.95605639180000002" blue="0.95605639180000002" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                 <constraints>
                                     <constraint firstAttribute="height" constant="30" id="LcG-cZ-8F6"/>
@@ -73,7 +80,7 @@
                                 </userDefinedRuntimeAttributes>
                             </textField>
                             <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Forgot your password?" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="IGk-zq-Vuc">
-                                <rect key="frame" x="23.5" y="306" width="255" height="21"/>
+                                <rect key="frame" x="37.5" y="326" width="255" height="21"/>
                                 <constraints>
                                     <constraint firstAttribute="width" constant="255" id="cRQ-Fx-kbz"/>
                                     <constraint firstAttribute="height" constant="21" id="ji6-K0-4Ik"/>
@@ -86,10 +93,10 @@
                                 </userDefinedRuntimeAttributes>
                             </label>
                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="h6E-Jo-Yzv">
-                                <rect key="frame" x="23.5" y="335" width="309" height="30"/>
+                                <rect key="frame" x="37.5" y="355" width="300" height="30"/>
                                 <color key="backgroundColor" red="0.2784313725" green="0.52549019610000003" blue="0.81568627449999997" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                 <constraints>
-                                    <constraint firstAttribute="width" constant="309" id="TrC-kd-fme"/>
+                                    <constraint firstAttribute="width" constant="300" id="TrC-kd-fme"/>
                                     <constraint firstAttribute="height" constant="30" id="k6V-2l-XzK"/>
                                 </constraints>
                                 <state key="normal" title="Sign In">
@@ -103,21 +110,19 @@
                         <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
                         <constraints>
                             <constraint firstItem="IGk-zq-Vuc" firstAttribute="top" secondItem="Scc-Vp-xlR" secondAttribute="bottom" constant="8" id="1SJ-dK-xLP"/>
-                            <constraint firstItem="K2W-Qp-fEZ" firstAttribute="top" secondItem="deg-NS-0CT" secondAttribute="top" id="1ry-fd-P7C"/>
+                            <constraint firstItem="K2W-Qp-fEZ" firstAttribute="top" secondItem="deg-NS-0CT" secondAttribute="topMargin" id="1ry-fd-P7C"/>
                             <constraint firstItem="Qgy-Nb-c9J" firstAttribute="top" secondItem="K2W-Qp-fEZ" secondAttribute="bottom" constant="15" id="3Wb-Y4-BP6"/>
-                            <constraint firstAttribute="trailingMargin" secondItem="N2M-V2-C45" secondAttribute="trailing" constant="22" id="5rh-oI-Jc0"/>
-                            <constraint firstAttribute="trailingMargin" secondItem="Scc-Vp-xlR" secondAttribute="trailing" constant="22" id="8ei-i0-4kh"/>
-                            <constraint firstItem="Scc-Vp-xlR" firstAttribute="leading" secondItem="deg-NS-0CT" secondAttribute="leadingMargin" constant="23" id="DAR-oM-TBM"/>
+                            <constraint firstItem="Scc-Vp-xlR" firstAttribute="leading" secondItem="deg-NS-0CT" secondAttribute="leadingMargin" constant="16" id="DAR-oM-TBM"/>
                             <constraint firstItem="N2M-V2-C45" firstAttribute="top" secondItem="Qgy-Nb-c9J" secondAttribute="bottom" constant="29" id="Gyn-kS-cTT"/>
                             <constraint firstItem="Qgy-Nb-c9J" firstAttribute="centerX" secondItem="deg-NS-0CT" secondAttribute="centerX" id="Kzu-ng-kaK"/>
-                            <constraint firstItem="N2M-V2-C45" firstAttribute="leading" secondItem="deg-NS-0CT" secondAttribute="leadingMargin" constant="23" id="RV6-Sa-HFQ"/>
+                            <constraint firstItem="N2M-V2-C45" firstAttribute="leading" secondItem="deg-NS-0CT" secondAttribute="leadingMargin" constant="16" id="RV6-Sa-HFQ"/>
                             <constraint firstItem="Scc-Vp-xlR" firstAttribute="top" secondItem="N2M-V2-C45" secondAttribute="bottom" constant="19" id="Vy5-oA-QcB"/>
                             <constraint firstItem="Scc-Vp-xlR" firstAttribute="centerX" secondItem="deg-NS-0CT" secondAttribute="centerX" id="W3W-Y3-9Ga"/>
+                            <constraint firstItem="IGk-zq-Vuc" firstAttribute="leading" secondItem="h6E-Jo-Yzv" secondAttribute="leading" id="cik-AT-jJb"/>
                             <constraint firstItem="K2W-Qp-fEZ" firstAttribute="leading" secondItem="deg-NS-0CT" secondAttribute="leading" id="ppW-yp-x4g"/>
-                            <constraint firstItem="h6E-Jo-Yzv" firstAttribute="centerX" secondItem="deg-NS-0CT" secondAttribute="centerX" constant="-9.5" id="qWh-OS-7W6"/>
+                            <constraint firstItem="h6E-Jo-Yzv" firstAttribute="centerX" secondItem="deg-NS-0CT" secondAttribute="centerX" id="qWh-OS-7W6"/>
                             <constraint firstAttribute="trailing" secondItem="K2W-Qp-fEZ" secondAttribute="trailing" id="rFr-gY-Ipf"/>
                             <constraint firstItem="N2M-V2-C45" firstAttribute="centerX" secondItem="deg-NS-0CT" secondAttribute="centerX" id="unA-FF-Hfz"/>
-                            <constraint firstItem="IGk-zq-Vuc" firstAttribute="centerX" secondItem="deg-NS-0CT" secondAttribute="centerX" constant="-36.5" id="y45-bQ-d8y"/>
                             <constraint firstItem="h6E-Jo-Yzv" firstAttribute="top" secondItem="IGk-zq-Vuc" secondAttribute="bottom" constant="8" id="yZ2-bI-iSn"/>
                         </constraints>
                     </view>
diff --git a/IBLocalizableSample/ViewController.swift b/IBLocalizableSample/ViewController.swift
index 8f275da..3d93b0e 100644
--- a/IBLocalizableSample/ViewController.swift
+++ b/IBLocalizableSample/ViewController.swift
@@ -10,11 +10,14 @@ import UIKit
 
 class ViewController: UIViewController {
 
+    let langs = ["es", "en", "zh-Hans", "fr", "zh-Hant"]
+    static var cur: Int = 0
+    
     override func viewDidLoad() {
         super.viewDidLoad()
         
         //programatic example
-        let frame = CGRect.init(x: 100, y: 190, width: 100, height: 20)
+        let frame = CGRect.init(x: 100, y: 210, width: 100, height: 20)
         let l = UILabel.init("hello", frame)
         l.textAlignment = .center
         l.center.x = self.view.center.x
@@ -22,7 +25,20 @@ class ViewController: UIViewController {
         self.view.addSubview(l)
         // Do any additional setup after loading the view, typically from a nib.
     }
-
+    
+    @IBAction func switchLanguage(_ sender: Any) {
+        ViewController.cur = (ViewController.cur + 1) % 5
+        Bundle.setCustomLanguage(langs[ViewController.cur])
+        
+        UIApplication.shared.keyWindow?.rootViewController = UIStoryboard.init(name: "Main", bundle: nil).instantiateInitialViewController()
+        UIApplication.shared.keyWindow?.alpha = 0
+//        AlertHelper.showHudWithMessage(message: "Setting Language...")
+        DispatchQueue.main.asyncAfter(deadline: DispatchTime.now()+1, execute: {
+            UIView.animate(withDuration: 0.5, animations: {UIApplication.shared.keyWindow?.alpha = 1})
+//            AlertHelper.hideHudMessage()
+        })
+    }
+    
     override func didReceiveMemoryWarning() {
         super.didReceiveMemoryWarning()
         // Dispose of any resources that can be recreated.
diff --git a/IBLocalizableSample/en.lproj/Localizable.strings b/IBLocalizableSample/en.lproj/Localizable.strings
index f8d7535..6616146 100644
--- a/IBLocalizableSample/en.lproj/Localizable.strings
+++ b/IBLocalizableSample/en.lproj/Localizable.strings
@@ -14,4 +14,4 @@
 "more" = "More";
 "main" = "Main";
 "hello" = "Hello";
-
+"world %@" = "en %@ worlds";
diff --git a/IBLocalizableSample/es.lproj/Localizable.strings b/IBLocalizableSample/es.lproj/Localizable.strings
index a68f9b9..e9d2ae6 100644
--- a/IBLocalizableSample/es.lproj/Localizable.strings
+++ b/IBLocalizableSample/es.lproj/Localizable.strings
@@ -14,4 +14,4 @@
 "more" = "Más";
 "main" = "Principal";
 "hello" = "Hola";
-
+"switch language" = "cambiar de idioma";
diff --git a/IBLocalizableSample/zh-Hans.lproj/Localizable.strings b/IBLocalizableSample/zh-Hans.lproj/Localizable.strings
new file mode 100644
index 0000000..11e4bd0
--- /dev/null
+++ b/IBLocalizableSample/zh-Hans.lproj/Localizable.strings
@@ -0,0 +1,18 @@
+/* 
+  Localizable.strings
+  IBLocalizable
+
+  Created by Chris Jimenez on 7/29/16.
+  Copyright © 2016 Chris Jimenez. All rights reserved.
+*/
+
+"email" = "邮箱";
+"password" = "密码";
+"forgot password" = "忘记密码？";
+"sign in" = "登录";
+"log out" = "登出";
+"more" = "更多";
+"main" = "主界面";
+"hello" = "你好";
+"world %@" = "%@ 个世界";
+"switch language" = "更换语言";
diff --git a/Podfile.lock b/Podfile.lock
deleted file mode 100644
index 2e7b88e..0000000
--- a/Podfile.lock
+++ /dev/null
@@ -1,20 +0,0 @@
-PODS:
-  - Nimble (7.3.1)
-  - Quick (1.3.2)
-
-DEPENDENCIES:
-  - Nimble
-  - Quick
-
-SPEC REPOS:
-  https://github.com/cocoapods/specs.git:
-    - Nimble
-    - Quick
-
-SPEC CHECKSUMS:
-  Nimble: 04f732da099ea4d153122aec8c2a88fd0c7219ae
-  Quick: 2623cb30d7a7f41ca62f684f679586558f483d46
-
-PODFILE CHECKSUM: 0554f14eba2c5af6b554aab63f90bf3264ad0841
-
-COCOAPODS: 1.5.3