Merge pull request #77 from Quantum2/master

Fix deprecated notification names

Author: jriosdev

iOSDropDown/Classes/iOSDropDown.swift

@@ -143,10 +143,10 @@ open class DropDown : UITextField{
         self.backgroundView.backgroundColor = .clear
         addGesture()
         if isSearchEnable && handleKeyboard{
-            NotificationCenter.default.addObserver(forName: NSNotification.Name.UIKeyboardWillShow, object: nil, queue: nil) { (notification) in
+            NotificationCenter.default.addObserver(forName: UIResponder.keyboardWillShowNotification, object: nil, queue: nil) { (notification) in
                 if self.isFirstResponder{
                 let userInfo:NSDictionary = notification.userInfo! as NSDictionary
-                    let keyboardFrame:NSValue = userInfo[UIKeyboardFrameEndUserInfoKey] as! NSValue
+                    let keyboardFrame:NSValue = userInfo[UIResponder.keyboardFrameEndUserInfoKey] as! NSValue
                 let keyboardRectangle = keyboardFrame.cgRectValue
                 self.keyboardHeight = keyboardRectangle.height
                     if !self.isSelected{
@@ -155,7 +155,7 @@ open class DropDown : UITextField{
                 }
 
             }
-            NotificationCenter.default.addObserver(forName: NSNotification.Name.UIKeyboardWillHide, object: nil, queue: nil) { (notification) in
+            NotificationCenter.default.addObserver(forName: UIResponder.keyboardWillHideNotification, object: nil, queue: nil) { (notification) in
                 if self.isFirstResponder{
                 self.keyboardHeight = 0
                 }