diff --git a/Example/GrowingTextView.xcodeproj/project.pbxproj b/Example/GrowingTextView.xcodeproj/project.pbxproj
index 587361b..89d454c 100644
--- a/Example/GrowingTextView.xcodeproj/project.pbxproj
+++ b/Example/GrowingTextView.xcodeproj/project.pbxproj
@@ -219,7 +219,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0720;
-				LastUpgradeCheck = 0900;
+				LastUpgradeCheck = 0930;
 				ORGANIZATIONNAME = CocoaPods;
 				TargetAttributes = {
 					607FACCF1AFB9204008FA782 = {
@@ -429,12 +429,14 @@
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
 				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
@@ -482,12 +484,14 @@
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
 				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
diff --git a/Example/GrowingTextView.xcodeproj/xcshareddata/xcschemes/GrowingTextView-Example.xcscheme b/Example/GrowingTextView.xcodeproj/xcshareddata/xcschemes/GrowingTextView-Example.xcscheme
index 8c419d6..de87694 100644
--- a/Example/GrowingTextView.xcodeproj/xcshareddata/xcschemes/GrowingTextView-Example.xcscheme
+++ b/Example/GrowingTextView.xcodeproj/xcshareddata/xcschemes/GrowingTextView-Example.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0900"
+   LastUpgradeVersion = "0930"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -40,7 +40,6 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
          <TestableReference
@@ -70,7 +69,6 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       launchStyle = "0"
       useCustomWorkingDirectory = "NO"
       ignoresPersistentStateOnLaunch = "NO"
diff --git a/Example/GrowingTextView.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist b/Example/GrowingTextView.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
new file mode 100644
index 0000000..18d9810
--- /dev/null
+++ b/Example/GrowingTextView.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>
diff --git a/Example/GrowingTextView/Base.lproj/Main.storyboard b/Example/GrowingTextView/Base.lproj/Main.storyboard
index 58ed205..1948bbe 100644
--- a/Example/GrowingTextView/Base.lproj/Main.storyboard
+++ b/Example/GrowingTextView/Base.lproj/Main.storyboard
@@ -1,11 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13771" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="fnq-Oa-kwt">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14109" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="fnq-Oa-kwt">
     <device id="retina4_7" orientation="portrait">
         <adaptation id="fullscreen"/>
     </device>
     <dependencies>
         <deployment version="2304" identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13772"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14088"/>
         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
@@ -124,10 +124,10 @@
                         <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
-                            <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="r6k-Bt-gaF">
+                            <view contentMode="scaleToFill" ambiguous="YES" translatesAutoresizingMaskIntoConstraints="NO" id="r6k-Bt-gaF">
                                 <rect key="frame" x="0.0" y="618" width="375" height="49"/>
                                 <subviews>
-                                    <textView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" textAlignment="natural" translatesAutoresizingMaskIntoConstraints="NO" id="cJC-8p-dX3" customClass="GrowingTextView" customModule="GrowingTextView">
+                                    <textView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" ambiguous="YES" textAlignment="natural" translatesAutoresizingMaskIntoConstraints="NO" id="cJC-8p-dX3" customClass="GrowingTextView" customModule="GrowingTextView">
                                         <rect key="frame" x="8" y="8" width="359" height="33"/>
                                         <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
                                         <fontDescription key="fontDescription" type="system" pointSize="14"/>
diff --git a/Example/GrowingTextView/Example1.swift b/Example/GrowingTextView/Example1.swift
index 4a8cd35..2a8f663 100644
--- a/Example/GrowingTextView/Example1.swift
+++ b/Example/GrowingTextView/Example1.swift
@@ -75,7 +75,7 @@ class Example1: UIViewController {
     
     @objc private func keyboardWillChangeFrame(_ notification: Notification) {
         if let endFrame = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
-            var keyboardHeight = view.bounds.height - endFrame.origin.y
+            var keyboardHeight = UIScreen.main.bounds.height - endFrame.origin.y
             if #available(iOS 11, *) {
                 if keyboardHeight > 0 {
                     keyboardHeight = keyboardHeight - view.safeAreaInsets.bottom
diff --git a/Example/GrowingTextView/Example2.swift b/Example/GrowingTextView/Example2.swift
index 7a2c3d9..ec4b4c8 100644
--- a/Example/GrowingTextView/Example2.swift
+++ b/Example/GrowingTextView/Example2.swift
@@ -35,7 +35,7 @@ class Example2: UIViewController {
     
     @objc private func keyboardWillChangeFrame(_ notification: Notification) {
         if let endFrame = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
-            var keyboardHeight = view.bounds.height - endFrame.origin.y
+            var keyboardHeight = UIScreen.main.bounds.height - endFrame.origin.y
             if #available(iOS 11, *) {
                 if keyboardHeight > 0 {
                     keyboardHeight = keyboardHeight - view.safeAreaInsets.bottom
diff --git a/Example/Pods/Pods.xcodeproj/project.pbxproj b/Example/Pods/Pods.xcodeproj/project.pbxproj
index aa86a07..7e7c772 100644
--- a/Example/Pods/Pods.xcodeproj/project.pbxproj
+++ b/Example/Pods/Pods.xcodeproj/project.pbxproj
@@ -319,7 +319,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0730;
-				LastUpgradeCheck = 0900;
+				LastUpgradeCheck = 0930;
 				TargetAttributes = {
 					1337470D3533D5288D3734A53202D210 = {
 						LastSwiftMigration = 0800;
@@ -408,12 +408,14 @@
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
 				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
@@ -564,12 +566,14 @@
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
 				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
diff --git a/Example/Pods/Pods.xcodeproj/xcshareddata/xcschemes/GrowingTextView.xcscheme b/Example/Pods/Pods.xcodeproj/xcshareddata/xcschemes/GrowingTextView.xcscheme
index cf11959..4ed25be 100644
--- a/Example/Pods/Pods.xcodeproj/xcshareddata/xcschemes/GrowingTextView.xcscheme
+++ b/Example/Pods/Pods.xcodeproj/xcshareddata/xcschemes/GrowingTextView.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0900"
+   LastUpgradeVersion = "0930"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -26,7 +26,6 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
       </Testables>
@@ -37,7 +36,6 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       launchStyle = "0"
       useCustomWorkingDirectory = "NO"
       ignoresPersistentStateOnLaunch = "NO"
diff --git a/GrowingTextView.podspec b/GrowingTextView.podspec
index 3df7d5f..854ca4b 100644
--- a/GrowingTextView.podspec
+++ b/GrowingTextView.podspec
@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = "GrowingTextView"
-  s.version          = "0.5.5"
+  s.version          = "0.5.6"
   s.summary          = "UITextView on Swift 3 and Swift 4. Support auto growing, placeholder and length limit."
 
 # This description is used to generate tags and improve search results.
diff --git a/Pod/Classes/GrowingTextView.swift b/Pod/Classes/GrowingTextView.swift
index 35e56dd..004ae04 100644
--- a/Pod/Classes/GrowingTextView.swift
+++ b/Pod/Classes/GrowingTextView.swift
@@ -168,12 +168,10 @@ open class GrowingTextView: UITextView {
     
     // Trim white space and new line characters when end editing.
     @objc func textDidEndEditing(notification: Notification) {
-        if let notificationObject = notification.object as? GrowingTextView {
-            if notificationObject === self {
-                if trimWhiteSpaceWhenEndEditing {
-                    text = text?.trimmingCharacters(in: .whitespacesAndNewlines)
-                    setNeedsDisplay()
-                }
+        if let sender = notification.object as? GrowingTextView, sender == self {
+            if trimWhiteSpaceWhenEndEditing {
+                text = text?.trimmingCharacters(in: .whitespacesAndNewlines)
+                setNeedsDisplay()
             }
             scrollToCorrectPosition()
         }
@@ -191,4 +189,3 @@ open class GrowingTextView: UITextView {
         }
     }
 }
-