Fixed adjusting to changing keyboard types, added keyboard settings (type, appearance, return type key, return key auto-enabled, right action by return key), trimming and preventing empty text in demo

Author: bdudarPGS

Demo/ViewController.swift

@@ -42,7 +42,13 @@ extension ViewController: MessagesViewDelegate {
     }
 
     func didTapRightButton() {
-        let text = messagesView.inputText
+        
+        let text = messagesView.inputText.trimmingCharacters(in: .whitespaces)
+        
+        guard !text.isEmpty else {
+            return
+        }
+        
         TestData.exampleMessageText.append(text)
         messagesView.refresh(scrollToLastMessage: true, animateLastMessage: true)
     }

MessagesView/MessageEditorTextView.swift

@@ -11,11 +11,17 @@ import UIKit
 class MessageEditorTextView: UITextField {
 
     func applySettings(settings: MessagesViewSettings) {
+        
         textColor = settings.textInputFieldTextColor
         backgroundColor = settings.textInputFieldBackgroundColor
         tintColor = settings.textInputTintColor
         layer.cornerRadius = settings.textInputFieldCornerRadius
         placeholder = settings.textInputFieldTextPlaceholderText
+        
+        keyboardType = settings.keyboardType
+        keyboardAppearance = settings.keyboardAppearance
+        returnKeyType = settings.returnKeyType
+        enablesReturnKeyAutomatically = settings.enablesReturnKeyAutomatically
     }
 
 }

MessagesView/MessagesToolbarContentView.swift

@@ -34,8 +34,8 @@ class MessagesToolbarContentView: UIView {
     private var leftButtonEnabled: Bool = true
     private var rightButtonEnabled: Bool = true
 
-    var leftButtonAction: (Void) -> () = {}
-    var rightButtonAction: (Void) -> () = {}
+    var leftButtonAction: () -> () = {}
+    var rightButtonAction: () -> () = {}
 
     private var leftTintColor: UIColor {
         return leftButtonEnabled ? settings.leftButtonTextColor : settings.leftButtonDisabledColor
@@ -196,6 +196,11 @@ extension MessagesToolbarContentView : UITextFieldDelegate {
     }
 
     func textFieldShouldReturn(_ textField: UITextField) -> Bool {
+        
+        if settings.shouldDoRightActionWithReturnKey {
+            didPressRightButton(textField)
+        }
+        
         return true
     }
 

MessagesView/MessagesToolbarContentView.xib

@@ -1,10 +1,11 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="11762" systemVersion="15G1217" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES">
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="13196" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES">
     <device id="retina4_7" orientation="portrait">
         <adaptation id="fullscreen"/>
     </device>
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="11757"/>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13173"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <objects>

MessagesView/MessagesView.swift

@@ -44,6 +44,7 @@ public class MessagesView: UIView {
     @IBOutlet weak var messageInputToolbarBottomConstraint: NSLayoutConstraint!
 
     private var toolBarBottomConstraintWithoutKeyboard: CGFloat = 0
+    private var toolBarFrameWithoutKeyboard: CGRect = .zero
 
     //MARK:- Public properties
 
@@ -97,6 +98,8 @@ public class MessagesView: UIView {
     var bubbleImageLeft: BubbleImage = BubbleImage(cornerRadius: 8)
     var bubbleImageRight: BubbleImage = BubbleImage(cornerRadius: 8).flipped
 
+    private var isKeyboardShown = false
+    
     public func setBubbleImagesWith(left: BubbleImage, right: BubbleImage? = nil) {
 
         bubbleImageLeft = left
@@ -207,49 +210,62 @@ public class MessagesView: UIView {
 
         NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: .UIKeyboardWillShow, object: nil)
         NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: .UIKeyboardWillHide, object: nil)
+        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChangeFrame), name: .UIKeyboardWillChangeFrame, object: nil)
     }
 
     @objc private func keyboardWillShow(notification: Notification) {
 
-        guard settings.shouldAdjustToKeyboard,
-            let userInfo = notification.userInfo,
-            let keyboardFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue,
-            let animationDuration = (userInfo[UIKeyboardAnimationDurationUserInfoKey] as? NSNumber)?.doubleValue else {
+        guard !isKeyboardShown else {
             return
         }
 
-        toolBarBottomConstraintWithoutKeyboard = messageInputToolbarBottomConstraint.constant
+        isKeyboardShown = true
 
-        let toolbarFrameInWindow = convert(messagesInputToolbar.frame, to: nil)
+        toolBarBottomConstraintWithoutKeyboard = messageInputToolbarBottomConstraint.constant
+        toolBarFrameWithoutKeyboard = convert(messagesInputToolbar.frame, to: nil)
 
-        let keyboardOverlap = toolbarFrameInWindow.origin.y - keyboardFrame.origin.y
+        respondToKeyboardFrameChange(notification: notification)
+    }
+    
+    @objc private func keyboardWillChangeFrame(notification: Notification) {
 
-        guard keyboardOverlap > 0 else {
+        guard isKeyboardShown else {
             return
         }
 
-        let verticalAdjusttment = keyboardOverlap + toolbarFrameInWindow.size.height
-        
-        messageInputToolbarBottomConstraint.constant = toolBarBottomConstraintWithoutKeyboard + verticalAdjusttment
-        
-        UIView.animate(withDuration: animationDuration) {
-            let contentOffset = self.messagesCollectionView.contentOffset
-            
-            self.messagesCollectionView.contentOffset = CGPoint(x: contentOffset.x, y: contentOffset.y + verticalAdjusttment)
-            self.layoutIfNeeded()
-        }
+        respondToKeyboardFrameChange(notification: notification)
     }
 
     @objc private func keyboardWillHide(notification: Notification) {
 
+        isKeyboardShown = false
+    }
+    
+    private func respondToKeyboardFrameChange(notification: Notification) {
+        
         guard settings.shouldAdjustToKeyboard,
-            let animationDuration = (notification.userInfo?[UIKeyboardAnimationDurationUserInfoKey] as? NSNumber)?.doubleValue else {
+            let userInfo = notification.userInfo,
+            let keyboardFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue,
+            let animationDuration = (userInfo[UIKeyboardAnimationDurationUserInfoKey] as? NSNumber)?.doubleValue else {
+                return
+        }
+        
+        let keyboardOverlap = toolBarFrameWithoutKeyboard.origin.y - keyboardFrame.origin.y
+        
+        let verticalAdjustment = keyboardOverlap > 0 ? keyboardOverlap + toolBarFrameWithoutKeyboard.size.height : 0
+        
+        let newBottomConstraint = toolBarBottomConstraintWithoutKeyboard + verticalAdjustment
+
+        guard newBottomConstraint != messageInputToolbarBottomConstraint.constant else {
             return
         }
 
-        messageInputToolbarBottomConstraint.constant = toolBarBottomConstraintWithoutKeyboard
+        messageInputToolbarBottomConstraint.constant = newBottomConstraint
 
         UIView.animate(withDuration: animationDuration) {
+            let contentOffset = self.messagesCollectionView.contentOffset
+            
+            self.messagesCollectionView.contentOffset = CGPoint(x: contentOffset.x, y: contentOffset.y + verticalAdjustment)
             self.layoutIfNeeded()
         }
     }

MessagesView/MessagesViewSettings.swift

@@ -16,6 +16,12 @@ public class MessagesViewSettings {
     public var leftButtonHidesKeyboard  = false
     public var rightButtonHidesKeyboard = false
     public var shouldAdjustToKeyboard = true
+    public var shouldDoRightActionWithReturnKey = true
+    
+    public var keyboardType: UIKeyboardType = .default
+    public var keyboardAppearance: UIKeyboardAppearance = .default
+    public var returnKeyType: UIReturnKeyType = .done
+    public var enablesReturnKeyAutomatically = false
 
     public var textInputScrollsToRecentMessage = true