diff --git a/README.md b/README.md
index 1fd7f37..b1e084c 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ With `SwiftAlertView`, you can easily make your desired Alert View in some lines
 [CocoaPods](https://cocoapods.org) is a dependency manager for Cocoa projects. To integrate SwiftAlertView into your Xcode project using CocoaPods, specify it in your `Podfile`:
 
 ```ruby
-pod 'SwiftAlertView', '~> 2.2.0'
+pod 'SwiftAlertView', '~> 2.2.1'
 ```
 
 #### Carthage
@@ -23,7 +23,7 @@ pod 'SwiftAlertView', '~> 2.2.0'
 [Carthage](https://github.com/Carthage/Carthage) is a decentralized dependency manager that builds your dependencies and provides you with binary frameworks. To integrate SwiftAlertView into your Xcode project using Carthage, specify it in your `Cartfile`:
 
 ```ogdl
-github "https://github.com/dinhquan/SwiftAlertView" ~> 2.2.0
+github "https://github.com/dinhquan/SwiftAlertView" ~> 2.2.1
 ```
 
 #### Swift Package Manager
@@ -34,7 +34,7 @@ Once you have your Swift package set up, adding SwiftAlertView as a dependency i
 
 ```swift
 dependencies: [
-    .package(url: "https://github.com/dinhquan/SwiftAlertView", .upToNextMajor(from: "2.2.0"))
+    .package(url: "https://github.com/dinhquan/SwiftAlertView", .upToNextMajor(from: "2.2.1"))
 ]
 ```
 
@@ -60,14 +60,14 @@ Drag and drop the file named ```SwiftAlertView``` inside `Source` in your projec
 ### Showing an alert
 
 ```swift
-SwiftAlertView.show(title: "Sample title", message: "Sample message", buttonTitles: "Cancel", "OK")
+SwiftAlertView.show(title: "Title", message: "Message", buttonTitles: "Cancel", "OK")
 ```
 
 Customization
 
 ```swift
-SwiftAlertView.show(title: "Sample title",
-                    message: "Sample message",
+SwiftAlertView.show(title: "Title",
+                    message: "Message",
                     buttonTitles: "OK", "Cancel") { alert in
     alert.backgroundColor = .yellow
     alert.cancelButtonIndex = 1
@@ -78,8 +78,8 @@ SwiftAlertView.show(title: "Sample title",
 Handle button clicked events
 
 ```swift
-SwiftAlertView.show(title: "Sample title",
-                    message: "Sample message",
+SwiftAlertView.show(title: "Title",
+                    message: "Message",
                     buttonTitles: "OK", "Cancel") {
     $0.style = .dark
 }
@@ -91,17 +91,28 @@ SwiftAlertView.show(title: "Sample title",
 Add text fields
 
 ```swift
-SwiftAlertView.show(title: "Sign in", buttonTitles: "Cancel", "Sign In") { alert in
-    alert.addTextField { textField in
+SwiftAlertView.show(title: "Sign in", buttonTitles: "Cancel", "Sign In") { alertView in
+    alertView.addTextField { textField in
         textField.placeholder = "Username"
     }
-    alert.addTextField { textField in
+    alertView.addTextField { textField in
         textField.placeholder = "Password"
     }
+    alertView.isEnabledValidationLabel = true
+    alertView.isDismissOnActionButtonClicked = false
 }
 .onActionButtonClicked { alert, buttonIndex in
     let username = alert.textField(at: 0)?.text ?? ""
-    print("Username: ", username)
+    if username.isEmpty {
+        alert.validationLabel.text = "Username is incorrect"
+    } else {
+        alert.dismiss()
+    }
+}
+.onTextChanged { _, text, index in
+    if index == 0 {
+        print("Username text changed: ", text ?? "")
+    }
 }
 ```
 
@@ -120,7 +131,7 @@ SwiftAlertView.show(contentView: customView, buttonTitles: "OK")
 Initialize an alert
 
 ```swift
-let alertView = SwiftAlertView(title: "Sample Title", message: "Sample Message", buttonTitles: "Cancel", "Button 1", "Button 2", "Button 3")
+let alertView = SwiftAlertView(title: "Title", message: "Message", buttonTitles: "Cancel", "Button 1", "Button 2", "Button 3")
 
 let alertView = SwiftAlertView(contentView: customView, buttonTitles: "OK")
 
@@ -218,6 +229,10 @@ public var textFieldSideMargin: CGFloat = 15.0
 public var textFieldBottomMargin: CGFloat = 15.0
 public var textFieldSpacing: CGFloat = 10.0
 public var isFocusTextFieldWhenShowing = true
+public var isEnabledValidationLabel = false
+public var validationLabel: UILabel! // access to validation label to customize font, color
+public var validationLabelTopMargin: CGFloat = 8.0
+public var validationLabelSideMargin: CGFloat = 15.0
 ```
 
 ## Contributing
diff --git a/Source/SwiftAlertView.swift b/Source/SwiftAlertView.swift
index ba2d7d9..08a7e30 100644
--- a/Source/SwiftAlertView.swift
+++ b/Source/SwiftAlertView.swift
@@ -61,14 +61,7 @@ public class SwiftAlertView: UIView {
     
     public var cancelButtonIndex = 0 { // default is 0, set this property if you want to change the position of cancel button
         didSet {
-            for i in 0..<buttons.count {
-                let button = buttons[i]
-                if i == cancelButtonIndex {
-                    button.titleLabel?.font = .boldSystemFont(ofSize: button.titleLabel?.font.pointSize ?? 17)
-                } else {
-                    button.titleLabel?.font = .systemFont(ofSize: button.titleLabel?.font.pointSize ?? 17)
-                }
-            }
+            updateCancelButtonIndex()
         }
     }
     public var buttonTitleColor = UIColor(red: 0, green: 0.478431, blue: 1, alpha: 1) // to change the title color of all buttons
@@ -585,6 +578,17 @@ extension SwiftAlertView {
         }
     }
     
+    private func updateCancelButtonIndex() {
+        for i in 0..<buttons.count {
+            let button = buttons[i]
+            if i == cancelButtonIndex {
+                button.titleLabel?.font = .boldSystemFont(ofSize: button.titleLabel?.font.pointSize ?? 17)
+            } else {
+                button.titleLabel?.font = .systemFont(ofSize: button.titleLabel?.font.pointSize ?? 17)
+            }
+        }
+    }
+    
     private func updateAlertStyle() {
         titleLabel.textColor = color(light: .black, dark: .white)
         messageLabel.textColor = color(light: .black, dark: .white)
diff --git a/SwiftAlertView.podspec b/SwiftAlertView.podspec
index f9cb50d..f68b3c1 100644
--- a/SwiftAlertView.podspec
+++ b/SwiftAlertView.podspec
@@ -1,7 +1,7 @@
 Pod::Spec.new do |s|
 
   s.name         = "SwiftAlertView"
-  s.version      = "2.2.0"
+  s.version      = "2.2.1"
   s.summary      = "A powerful customizable Alert View written in Swift."
   s.description  = <<-DESC
                    SwiftAlertView is a powerful customizable Alert View written in Swift. With SwiftAlertView, you can easily make your desired Alert View in some lines of code.
diff --git a/SwiftAlertView.xcodeproj/project.pbxproj b/SwiftAlertView.xcodeproj/project.pbxproj
index ba1729d..d612f62 100644
--- a/SwiftAlertView.xcodeproj/project.pbxproj
+++ b/SwiftAlertView.xcodeproj/project.pbxproj
@@ -14,6 +14,9 @@
 		146BEE6E272930EB0004D971 /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 146BEE6C272930EB0004D971 /* LaunchScreen.storyboard */; };
 		146BEE76272931A80004D971 /* CustomView.xib in Resources */ = {isa = PBXBuildFile; fileRef = 146BEE75272931A80004D971 /* CustomView.xib */; };
 		146BEE792729328C0004D971 /* SwiftAlertView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 146BEE782729328C0004D971 /* SwiftAlertView.swift */; };
+		14B4714B279106A800634E54 /* SwiftAlertView.podspec in Resources */ = {isa = PBXBuildFile; fileRef = 14B47147279106A700634E54 /* SwiftAlertView.podspec */; };
+		14B4714D279106A800634E54 /* LICENSE in Resources */ = {isa = PBXBuildFile; fileRef = 14B47149279106A800634E54 /* LICENSE */; };
+		14B4714E279106A800634E54 /* README.md in Resources */ = {isa = PBXBuildFile; fileRef = 14B4714A279106A800634E54 /* README.md */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
@@ -27,6 +30,9 @@
 		146BEE75272931A80004D971 /* CustomView.xib */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = file.xib; path = CustomView.xib; sourceTree = "<group>"; };
 		146BEE782729328C0004D971 /* SwiftAlertView.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SwiftAlertView.swift; sourceTree = "<group>"; };
 		146BEE7A272932F20004D971 /* Marker Felt.ttf */ = {isa = PBXFileReference; lastKnownFileType = file; path = "Marker Felt.ttf"; sourceTree = "<group>"; };
+		14B47147279106A700634E54 /* SwiftAlertView.podspec */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = SwiftAlertView.podspec; sourceTree = "<group>"; };
+		14B47149279106A800634E54 /* LICENSE */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = LICENSE; sourceTree = "<group>"; };
+		14B4714A279106A800634E54 /* README.md */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = net.daringfireball.markdown; path = README.md; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -43,6 +49,9 @@
 		146BEE55272930E90004D971 = {
 			isa = PBXGroup;
 			children = (
+				14B47149279106A800634E54 /* LICENSE */,
+				14B4714A279106A800634E54 /* README.md */,
+				14B47147279106A700634E54 /* SwiftAlertView.podspec */,
 				146BEE772729328C0004D971 /* Source */,
 				146BEE60272930E90004D971 /* SwiftAlertView */,
 				146BEE5F272930E90004D971 /* Products */,
@@ -137,8 +146,11 @@
 			isa = PBXResourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				14B4714D279106A800634E54 /* LICENSE in Resources */,
 				146BEE6E272930EB0004D971 /* LaunchScreen.storyboard in Resources */,
 				146BEE76272931A80004D971 /* CustomView.xib in Resources */,
+				14B4714E279106A800634E54 /* README.md in Resources */,
+				14B4714B279106A800634E54 /* SwiftAlertView.podspec in Resources */,
 				146BEE6B272930EB0004D971 /* Assets.xcassets in Resources */,
 				146BEE69272930E90004D971 /* Main.storyboard in Resources */,
 			);
diff --git a/SwiftAlertView/AppDelegate.swift b/SwiftAlertView/AppDelegate.swift
index a25d68f..decc063 100644
--- a/SwiftAlertView/AppDelegate.swift
+++ b/SwiftAlertView/AppDelegate.swift
@@ -16,7 +16,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
         // Override point for customization after application launch.
         
-        return true
+        return true 
     }
 
 }
diff --git a/SwiftAlertView/Images/demo.png b/SwiftAlertView/Images/demo.png
index 6cee9dc..0206779 100644
Binary files a/SwiftAlertView/Images/demo.png and b/SwiftAlertView/Images/demo.png differ
diff --git a/SwiftAlertView/ViewController.swift b/SwiftAlertView/ViewController.swift
index 82eb426..9e00d42 100644
--- a/SwiftAlertView/ViewController.swift
+++ b/SwiftAlertView/ViewController.swift
@@ -43,7 +43,6 @@ final class ViewController: UITableViewController {
             SwiftAlertView.show(title: "Title",
                                 message: "Message",
                                 buttonTitles: "Button 1", "Button 2", "Button 3", "Cancel") { alertView in
-                alertView.style = .auto
                 alertView.cancelButtonIndex = 3
                 alertView.buttonTitleColor = UIColor(red: 0.8764, green: 0.5, blue: 0.3352, alpha: 1)
                 alertView.addTextField { textField in
@@ -58,13 +57,14 @@ final class ViewController: UITableViewController {
         case 2:
             SwiftAlertView.show(title: "Sign in", buttonTitles: "Cancel", "Sign In") { alertView in
                 alertView.addTextField { textField in
-                    textField.placeholder = "Username"
+                    textField.attributedPlaceholder = NSAttributedString(string: "Username", attributes: [.foregroundColor: UIColor.gray])
                 }
                 alertView.addTextField { textField in
-                    textField.placeholder = "Password"
+                    textField.attributedPlaceholder = NSAttributedString(string: "Password", attributes: [.foregroundColor: UIColor.gray])
                 }
                 alertView.isEnabledValidationLabel = true
                 alertView.isDismissOnActionButtonClicked = false
+                alertView.style = .dark
             }
             .onActionButtonClicked { alert, buttonIndex in
                 let username = alert.textField(at: 0)?.text ?? ""