diff --git a/MJMaterialSwitch/MJMaterialSwitch.swift b/MJMaterialSwitch/MJMaterialSwitch.swift
index b728dfb..8b7d8b5 100644
--- a/MJMaterialSwitch/MJMaterialSwitch.swift
+++ b/MJMaterialSwitch/MJMaterialSwitch.swift
@@ -23,17 +23,10 @@ public enum MJMaterialSwitchSize {
     case big, normal, small
 }
 
-
-protocol MJMaterialSwitchDelegate: class {
-    func switchStateChanged(_ currentState: MJMaterialSwitchState)
-}
-
 class MJMaterialSwitch: UIControl {
 
 
     //MARK: - Properties
-    //MARK:  Delegate
-    weak var delegate: MJMaterialSwitchDelegate? = nil
 
     //MARK:  State
     /** A Boolean value that represents switch's current state(ON/OFF). YES to ON, NO to OFF the switch */
@@ -385,12 +378,6 @@ class MJMaterialSwitch: UIControl {
 
     //The event handling method
     @objc func switchAreaTapped(recognizer: UITapGestureRecognizer) {
-        // Delegate method
-        if self.isOn {
-            self.delegate?.switchStateChanged(.off)
-        } else {
-            self.delegate?.switchStateChanged(.on)
-        }
         self.changeThumbState()
     }
 
@@ -427,11 +414,10 @@ class MJMaterialSwitch: UIControl {
         }) { (finished) in
 
             // change state to ON
-            if self.isOn {
+            if !self.isOn {
                 self.isOn = true // Expressly put this code here to change surely and send action correctly
                 self.sendActions(for: UIControlEvents.valueChanged)
             }
-            self.isOn = true
             // print("now isOn: %d", self.isOn)
             // print("thumb end pos: %@", NSStringFromCGRect(self.switchThumb.frame))
             // Bouncing effect: Move thumb a bit, for better UX
@@ -471,7 +457,6 @@ class MJMaterialSwitch: UIControl {
                 self.isOn = false // Expressly put this code here to change surely and send action correctly
                 self.sendActions(for: UIControlEvents.valueChanged)
             }
-            self.isOn = false
             // print("now isOn: %d", self.isOn)
             // print("thumb end pos: %@", NSStringFromCGRect(self.switchThumb.frame))
             // Bouncing effect: Move thumb a bit, for better UX
@@ -502,11 +487,10 @@ class MJMaterialSwitch: UIControl {
             self.track.backgroundColor = self.trackDisabledTintColor
         }
 
-        if self.isOn {
+        if !self.isOn {
             self.isOn = true
             self.sendActions(for: UIControlEvents.valueChanged)
         }
-        self.isOn = true
     }
 
     // Without animation
@@ -528,7 +512,6 @@ class MJMaterialSwitch: UIControl {
             self.isOn = false
             self.sendActions(for: UIControlEvents.valueChanged)
         }
-        self.isOn = false
     }
 
     // Initialize and appear ripple effect
@@ -636,12 +619,6 @@ class MJMaterialSwitch: UIControl {
         // print("track midPosX: %f", CGRectGetMidX(self.track.frame))
         // print("%@", NSStringFromCGRect(self.switchThumb.frame))
 
-        // Delegate method
-        if self.isOn {
-            self.delegate?.switchStateChanged(.off)
-        } else {
-            self.delegate?.switchStateChanged(.on)
-        }
         self.changeThumbState()
     }
 
@@ -698,5 +675,4 @@ class MJMaterialSwitch: UIControl {
             }
         }
     }
-
 }
diff --git a/MJMaterialSwitch/ViewController.swift b/MJMaterialSwitch/ViewController.swift
index 848c206..b9536bf 100644
--- a/MJMaterialSwitch/ViewController.swift
+++ b/MJMaterialSwitch/ViewController.swift
@@ -8,7 +8,12 @@
 
 import UIKit
 
-class ViewController: UIViewController, MJMaterialSwitchDelegate {
+class ViewController: UIViewController {
+
+    // Tags
+    let kSmallSwitch = 1
+    let kMediumSwitch = 2
+    let kLargeSwitch = 3
 
     var androidSwitchSmall : MJMaterialSwitch!
 
@@ -16,18 +21,20 @@ class ViewController: UIViewController, MJMaterialSwitchDelegate {
         super.viewDidLoad()
 
         self.androidSwitchSmall = MJMaterialSwitch(withSize: .small, style: MJMaterialSwitchStyle.light, state: MJMaterialSwitchState.on)
-        self.androidSwitchSmall.delegate = self
+        self.androidSwitchSmall.tag = kSmallSwitch
+        self.androidSwitchSmall.addTarget(self, action: #selector(switchStateChanged(_:)), for: UIControlEvents.valueChanged)
         self.view.addSubview(self.androidSwitchSmall)
 
         let androidSwitchMedium = MJMaterialSwitch(withSize: .normal, style: MJMaterialSwitchStyle.medium, state: MJMaterialSwitchState.on)
-        androidSwitchMedium.delegate = self
         androidSwitchMedium.isBounceEnabled = false
         androidSwitchMedium.isRippleEnabled = true
+        androidSwitchMedium.tag = kMediumSwitch
+        androidSwitchMedium.addTarget(self, action: #selector(switchStateChanged(_:)), for: UIControlEvents.valueChanged)
         self.view.addSubview(androidSwitchMedium)
 
-
         let androidSwitchLarge = MJMaterialSwitch(withSize: .big, style: MJMaterialSwitchStyle.dark, state: MJMaterialSwitchState.on)
-        androidSwitchLarge.delegate = self
+        androidSwitchLarge.tag = kLargeSwitch
+        androidSwitchLarge.addTarget(self, action: #selector(switchStateChanged(_:)), for: UIControlEvents.valueChanged)
         self.view.addSubview(androidSwitchLarge)
 
         self.androidSwitchSmall.center = self.view.center
@@ -38,15 +45,25 @@ class ViewController: UIViewController, MJMaterialSwitchDelegate {
         androidSwitchLarge.center = self.view.center
         androidSwitchLarge.center.y = self.view.center.y + 50
 
-
     }
 
     override func didReceiveMemoryWarning() {
         super.didReceiveMemoryWarning()
     }
 
-    func switchStateChanged(_ currentState: MJMaterialSwitchState) {
-        print(currentState)
+    @objc func switchStateChanged(_ mjSwitch: MJMaterialSwitch) {
+
+        if mjSwitch.tag == kSmallSwitch {
+            print(mjSwitch.isOn, mjSwitch.tag, "Small")
+
+        } else if mjSwitch.tag == kMediumSwitch {
+
+            print(mjSwitch.isOn, mjSwitch.tag, "Medium")
+
+        } else if mjSwitch.tag == kLargeSwitch {
+            print(mjSwitch.isOn, mjSwitch.tag, "Large")
+
+        }
     }
 }