Unity实现虚拟键盘

本文实例为大家分享了Unity实现虚拟键盘的具体代码，供大家参考，具体内容如下

这是一个网上找的插件，自己改了点东西，方便使用在项目中。暂时不适用中文输入，中文输入可能得调出系统输入法，项目不需要就没去研究了，大伙有兴趣可以研究研究。

包含两个类，一个是虚拟键盘类，还一个是文本框输入类。下面直接上代码：

using UnityEngine;
using System.Collections.Generic;
 
/*
 * On Screen Keyboard
 * By Richard Taylor, Holopoint Interactive Pty. Ltd.
 * 
 * FEATURES:
 * - Fully configurable layout
 * - Fully skinnable
 * - Key select and press audio
 * - Configurable caps functionality
 * - Configurable key repeat settings
 * - Works with both joystick/gamepad and mouse/touchscreen input
 * - Simple integration
 * - Tested using Xbox 360 controller and iPad
 */
 
 
/*
 * Time list:
 * June于2020.04.17改
 * 
 */
 
public enum ShiftState { Off, Shift, CapsLock }
 
public class OnScreenKeyboard : MonoBehaviour {
 
 // INSPECTOR VISIBLE PROPERTIES -------------------------------------------
 
 // Skinning
 public GUIStyle boardStyle;
 public GUIStyle keyStyle;
 public Texture2D selectionImage;
 
 // Board and button sizes
 public Rect screenRect = new Rect(0, 0, 0, 0);
 public Vector2 stdKeySize = new Vector2(32, 32);
 public Vector2 lgeKeySize = new Vector2(64, 32);
 
 // Key audio
 public AudioClip keySelectSound = null;
 public AudioClip keyPressSound = null;
 
 // Shift settings
 public bool shiftStateSwitchEnabled = true;
 public ShiftState shiftStateDefault = ShiftState.Off;
 
 // Joystick settings
 public bool joystickEnabled = true;
 public string joyPressButton = "Fire1";
 public string joyCapsButton = "Fire2";
 
 // Our keys. By default we'll include a simplified QWERTY keyboard handy 
 // for name entry, but this can literally be anything you want. Either the 
 // two arrays must be of matching length, or lowerKeys must be of size 0.
 public string[] upperKeys = { "Q", "W", "E", "R", "T", "Y", "U", "I", "O", "P", "<<", "<row>", 
     "A", "S", "D", "F", "G", "H", "J", "K", "L", "Done", "<row>", 
     "Z", "X", "C", "V", "B", "N", "M", "Caps", "Space" };
 
 public string[] lowerKeys = { "q", "w", "e", "r", "t", "y", "u", "i", "o", "p", "<<", "<row>", 
     "a", "s", "d", "f", "g", "h", "j", "k", "l", "Done", "<row>", 
     "z", "x", "c", "v", "b", "n", "m", "Caps", "Space" };
 
 // The size must match the number of rows, or be 0
 public float[] rowIndents = { 0.0f, 0.2f, 0.5f };
 
 // Delays for repeated events
 public float initialRepeatDelay = 0.8f;
 public float continuedRepeatDelay = 0.2f;
 public float moveRepeatDelay = 0.3f;
 
 
 // INTERNAL DATA MEMBERS --------------------------------------------------
 private string keyPressed = "";
 private int pSelectedButton;
 
 private GUIStyle pressedStyle = null;
 
 private float keyRepeatTimer = 0;
 private bool keyDownPrevFrame = false;
 private bool keyReleased = false;
 private bool lastKeyWasShift = false;
 
 private float moveTimer = 0;
 
 private ShiftState shiftState;
 
 private bool[] keySizes;
 private Rect[] keyRects;
 private int[] rowMarkers;
 
 private int selectedButton;
 
 private AudioSource keySelectSource = null;
 private AudioSource keyPressSource = null;
 
 // Change this if it's conflicting with your own GUI's windows
 private int windowId = 0;
 
 
 /// <summary>
 /// 新增属性，控制虚拟键盘在屏幕中的位置
 /// </summary>
 [Header("June_Add_Attribute_Control_keyBoardTF---------------------------------------")]
 public float _keyBoardTF_X;
 public float _keyBoardTF_Y;
 
 
 
 // INITIALISATION ---------------------------------------------------------
 void Awake()
 {
 // Check that our key array sizes match
 if (upperKeys.Length != lowerKeys.Length && !(lowerKeys.Length == 0 && !shiftStateSwitchEnabled))
 {
 print("Error: OnScreenKeyboard needs the same number of upper and lower case keys, or there must be no lower keys and caps switch must be disabled");
 Destroy(this);
 }
 
 // Check for row markers and count row lengths
 List<int> rowMarkersTemp = new List<int>();
 for (int i = 0; i < upperKeys.Length; i++) 
 if (upperKeys[i] == "<row>") rowMarkersTemp.Add(i);
 rowMarkers = rowMarkersTemp.ToArray();
 
 // Check row indents
 if (rowIndents.Length < rowMarkers.Length + 1)
 {
  float[] rowIndentsTemp = new float[rowMarkers.Length + 1];
  for (int i = 0; i < rowIndentsTemp.Length; i++)
  {
  if (i < rowIndents.Length) rowIndentsTemp[i] = rowIndents[i];
  else rowIndentsTemp[i] = 0;
  }
 }
 
 // Check button sizes - anything that's not a single character is a "large" key
 keySizes = new bool[upperKeys.Length];
 for (int i = 0; i < upperKeys.Length; i++) keySizes[i] = upperKeys[i].Length > 1;
 
 // Populate the array of key rectangles
 keyRects = new Rect[upperKeys.Length];
 int currentRow = 0;
 float xPos = (rowIndents.Length > 0 ? rowIndents[currentRow] : 0) + stdKeySize.x*0.33f;
 float yPos = stdKeySize.y*1.33f*currentRow + stdKeySize.y*0.33f;
 for (int i = 0; i < upperKeys.Length; i++)
 {
 // On the start of a new line, position the new key accordingly
  if (IsRowMarker(i))
  {
  if (i != 0) currentRow++;
  xPos = (rowIndents.Length > 0 ? rowIndents[currentRow] : 0) + stdKeySize.x * 0.33f;
  yPos = stdKeySize.y*1.33f*currentRow + stdKeySize.y * 0.33f;
  }
  else
  {
  // Draw the key, and set keyPressed accordingly
  keyRects[i] = new Rect(screenRect.x + xPos, screenRect.y + yPos, keySizes[i] ? lgeKeySize.x : stdKeySize.x, keySizes[i] ? lgeKeySize.y : stdKeySize.y);
 
  // Move over to the next key's position on this line
  xPos += keySizes[i] ? lgeKeySize.x + stdKeySize.x*0.33f : stdKeySize.x*1.33f;
  }
 }
 
 // Put ourselves in a default screen position if we haven't been explicitly placed yet
 if (screenRect.x == 0 && screenRect.y == 0 && screenRect.width == 0 && screenRect.height == 0)
 {
  // Figure out how big we need to be
  float maxWidth = 0;
 float maxHeight = 0;
 for (int i = 0; i < keyRects.Length; i++)
 {
 if (keyRects[i].xMax > maxWidth) maxWidth = keyRects[i].xMax;
 if (keyRects[i].yMax > maxHeight) maxHeight = keyRects[i].yMax;
 }
 maxWidth += stdKeySize.x*0.33f;
 maxHeight += stdKeySize.y*0.33f;
 
  screenRect = new Rect(_keyBoardTF_X, _keyBoardTF_Y, maxWidth, maxHeight);
 }
 
 // If we've got audio, create sources so we can play it
 if (keySelectSound != null)
 {
 keySelectSource = gameObject.AddComponent<AudioSource>() as AudioSource;
 keySelectSource.spatialBlend = 0;
 keySelectSource.clip = keySelectSound;
 }
 if (keyPressSound != null)
 {
 keyPressSource = gameObject.AddComponent<AudioSource>() as AudioSource;
 keyPressSource.spatialBlend = 0;
 keyPressSource.clip = keyPressSound;
 }
 
 // Set the initial shift state
 if (shiftStateSwitchEnabled) SetShiftState(shiftStateDefault);
 
 // Create a pressed button skin for joysticks
 pressedStyle = new GUIStyle();
 pressedStyle.normal.background = keyStyle.active.background;
 pressedStyle.border = keyStyle.border;
 pressedStyle.normal.textColor = keyStyle.active.textColor;
 pressedStyle.alignment = keyStyle.alignment;
 //新增字体样式------->按钮按下的时候调用
 pressedStyle.font = keyStyle.font;
 
 }
 
 
 // GAME LOOP --------------------------------------------------------------
 
 void Update() 
 {
 // Handle keys being released
 if (!keyDownPrevFrame) 
 {
 keyRepeatTimer = 0;
 if (!keyReleased) KeyReleased();
 }
 keyDownPrevFrame = false;
 
 // Check mouse input
 Vector3 guiMousePos = Input.mousePosition;
 guiMousePos.y = Screen.height - guiMousePos.y;
 for (int i = 0; i < keyRects.Length; i++)
 {
 Rect clickRect = keyRects[i];
 clickRect.x += screenRect.x; clickRect.y += screenRect.y;
 // Check for the click ourself, because we want to do it differently to usual
 if (clickRect.Contains(guiMousePos)) 
 {
 selectedButton = i;
 if (Input.GetMouseButtonDown(0)) KeyPressed(); 
 else if (Input.GetMouseButton(0)) KeyHeld();
 else if (Input.GetMouseButtonUp(0)) KeyReleased();
 }
 }
 
 // If the joystick is in use, update accordingly
 if (joystickEnabled) CheckJoystickInput();
 }
 
 private void CheckJoystickInput()
 { 
 // KEY SELECTION 
 float horiz = Input.GetAxis("Horizontal");
 float vert = Input.GetAxis("Vertical");
 
 moveTimer -= Time.deltaTime;
 if (moveTimer < 0) moveTimer = 0;
 
 bool hadInput = false;
 bool moved = false;
 if (horiz > 0.5f)
 {
 if (moveTimer <= 0) 
 {
 SelectRight();
 moved = true;
 }
 hadInput = true;
 }
 else if (horiz < -0.5f)
 {
 if (moveTimer <= 0) 
 {
 SelectLeft();
 moved = true;
 }
 hadInput = true;
 }
 if (vert < -0.5f)
 {
 if (moveTimer <= 0) 
 {
 SelectDown();
 moved = true;
 }
 hadInput = true;
 }
 else if (vert > 0.5f)
 {
 if (moveTimer <= 0) 
 {
 SelectUp();
 moved = true;
 }
 hadInput = true; 
 }
 if (!hadInput) moveTimer = 0;
 if (moved) 
 {
 moveTimer += moveRepeatDelay;
 if (keySelectSource != null) keySelectSource.Play();
 }
 selectedButton = Mathf.Clamp(selectedButton, 0, upperKeys.Length - 1);
 
 // CAPITALS
 if (shiftStateSwitchEnabled &&
  (Input.GetKeyDown(KeyCode.LeftShift) ||
  Input.GetButtonDown(joyCapsButton)))
  shiftState = (shiftState == ShiftState.CapsLock ? ShiftState.Off : ShiftState.CapsLock);
 
 // TYPING
 if (Input.GetButtonDown(joyPressButton)) KeyPressed();
 else if (Input.GetButton(joyPressButton)) KeyHeld();
 }
 
 // Called on the first frame where a new key is pressed
 private void KeyPressed()
 {
 keyPressed = (shiftState != ShiftState.Off) ? upperKeys[selectedButton] : lowerKeys[selectedButton];
 pSelectedButton = selectedButton;
 keyRepeatTimer = initialRepeatDelay;
 
 keyDownPrevFrame = true;
 keyReleased = false;
 lastKeyWasShift = false;
 
 if (keyPressSource != null) keyPressSource.Play();
 }
 
 // Called for every frame AFTER the first while a key is being held
 private void KeyHeld()
 {
 // If the key being pressed has changed, revert to an initial press
 if (selectedButton != pSelectedButton)
 {
 KeyReleased();
 KeyPressed();
 return;
 }
 
 // Check if we're ready to report another press yet
 keyRepeatTimer -= Time.deltaTime;
 if (keyRepeatTimer < 0)
 {
 keyPressed = (shiftState != ShiftState.Off) ? upperKeys[selectedButton] : lowerKeys[selectedButton];
 keyRepeatTimer += continuedRepeatDelay; 
 
 if (keyPressSource != null) keyPressSource.Play();
 }
 
 keyDownPrevFrame = true;
 keyReleased = false;
 }
 
 // Called the frame after a key is released
 private void KeyReleased()
 {
 keyDownPrevFrame = false;
 keyReleased = true;
 
 if (shiftState == ShiftState.Shift && !lastKeyWasShift)
 SetShiftState(ShiftState.Off);
 }
 
 // Selects the key to the left of the currently selected key
 private void SelectLeft()
 {
 selectedButton--;
 
 // If we've hit the start of a row, wrap to the end of it instead
 if (IsRowMarker(selectedButton) || selectedButton < 0)
 {
  selectedButton++;
  while (!IsRowMarker(selectedButton+1) && selectedButton+1 < upperKeys.Length) selectedButton++;
 }
 }
 
 // Selects the key to the right of the currently selected key
 private void SelectRight()
 {
 selectedButton++;
 
 // If we've hit the end of a row, wrap to the start of it instead
 if (IsRowMarker(selectedButton) || selectedButton >= upperKeys.Length)
 {
  selectedButton--;
  while (!IsRowMarker(selectedButton-1) && selectedButton-1 >= 0) selectedButton--;
 }
 }
 
 // Selects the key above the currently selected key
 private void SelectUp()
 {
 // Find the center of the currently selected button
 float selCenter = keyRects[selectedButton].x + keyRects[selectedButton].width/2;
 
 // Find the start of the next button;
 int tgtButton = selectedButton;
 while (!IsRowMarker(tgtButton) && tgtButton >= 0) tgtButton--;
 if (IsRowMarker(tgtButton)) tgtButton--;
 if (tgtButton < 0) tgtButton = upperKeys.Length-1;
 
 // Find the button with the closest center on that line
 float nDist = float.MaxValue;
 while (!IsRowMarker(tgtButton) && tgtButton >= 0)
 {
 float tgtCenter = keyRects[tgtButton].x + keyRects[tgtButton].width/2;
 float tDist = Mathf.Abs(tgtCenter - selCenter);
 if (tDist < nDist) 
 {
 nDist = tDist;
 }
 else 
 {
 selectedButton = tgtButton+1; 
 return;
 }
 tgtButton--;
 }
 selectedButton = tgtButton+1;
 }
 
 // Selects the key below the currently selected key
 private void SelectDown()
 {
 // Find the center of the currently selected button
 float selCenter = keyRects[selectedButton].x + keyRects[selectedButton].width/2;
 
 // Find the start of the next button;
 int tgtButton = selectedButton;
 while (!IsRowMarker(tgtButton) && tgtButton < upperKeys.Length) tgtButton++;
 if (IsRowMarker(tgtButton)) tgtButton++;
 if (tgtButton >= upperKeys.Length) tgtButton = 0;
 
 // Find the button with the closest center on that line
 float nDist = float.MaxValue;
 while (!IsRowMarker(tgtButton) && tgtButton < upperKeys.Length)
 {
 float tgtCenter = keyRects[tgtButton].x + keyRects[tgtButton].width/2;
 float tDist = Mathf.Abs(tgtCenter - selCenter);
 if (tDist < nDist) 
 {
 nDist = tDist;
 }
 else 
 {
 selectedButton = tgtButton-1; 
 return;
 }
 tgtButton++;
 }
 selectedButton = tgtButton-1;
 }
 
 // Returns the row number of a specified button
 private int ButtonRow(int buttonIndex)
 {
 for (int i = 0; i < rowMarkers.Length; i++)
  if (buttonIndex < rowMarkers[i]) return i;
 
 return rowMarkers.Length;
 }
 
 
 // GUI FUNCTIONALITY ------------------------------------------------------
 
 void OnGUI() 
 { 
 GUI.Window(windowId, screenRect, WindowFunc, "", boardStyle);
 }
 
 private void WindowFunc(int id)
 {
 for (int i = 0; i < upperKeys.Length; i++)
 {
  if (!IsRowMarker(i))
  {
  // Draw a glow behind the selected button
  if (i == selectedButton)
   GUI.DrawTexture(new Rect(keyRects[i].x-5, keyRects[i].y-5, keyRects[i].width+10, keyRects[i].height+10), selectionImage);
  // Draw the key
 // Note that we don't do click detection here, we do it in update
 GUI.Button(keyRects[i], (shiftState != ShiftState.Off) ? upperKeys[i] : lowerKeys[i], 
  (joystickEnabled && selectedButton == i && Input.GetButton(joyPressButton) ? pressedStyle : keyStyle));
  }
 }
 }
 
 // Returns true if they item at a specified index is a row end marker
 private bool IsRowMarker(int currentKeyIndex)
 {
 for (int i = 0; i < rowMarkers.Length; i++) if (rowMarkers[i] == currentKeyIndex) return true;
 return false;
 }
 
 
 // CONTROL INTERFACE ------------------------------------------------------
 
 // Returns the latest key to be pressed, or null if no new key was pressed 
 // since last time you checked. This means that you can only grab a single 
 // keypress once, as it's cleared once you've read it. It also means that 
 // if you let the user press multiple keys between checks only the most 
 // recent one will be picked up each time.
 public string GetKeyPressed() 
 {
 if (keyPressed == null) keyPressed = "";
 
 string key = keyPressed;
 keyPressed = "";
 return key; 
 }
 
 // Toggle the caps state from elsewhere
 public void SetShiftState(ShiftState newShiftState)
 {
 if (!shiftStateSwitchEnabled) return;
 
 shiftState = newShiftState;
 if (shiftState == ShiftState.Shift) lastKeyWasShift = true;
 }
 
 public ShiftState GetShiftState() { return shiftState; }
}

using UnityEngine;
using UnityEngine.UI;
 
 
/// <summary>
/// 这是虚拟键盘插件脚本，June于2020.4.16改
/// </summary>
 
 
public class OnScreenKeyboardExample : MonoBehaviour 
{
 public OnScreenKeyboard osk;
 /// <summary>
  /// 输入文字
  /// </summary>
 private string _inputString;
  /// <summary>
  /// 输入文本框
  /// </summary>
  public InputField _inputField;
 
  //每次激活清空文本框内容
  private void OnEnable()
  {
    _inputString = "";
  }
 
  void Update () 
  {
 
 // You can use input from the OSK just by asking for the most recent 
 // pressed key, which will be returned to you as a string, or null if 
 // no key has been pressed since you last checked. Note that if more 
 // than one key has been pressed you will only be given the most recent.
 string keyPressed = osk.GetKeyPressed();
 if (keyPressed != "")
 {
      
  // Take different action depending on what key was pressed
  if (keyPressed == "Backspace" || keyPressed == "<<")
  {
  // Remove a character
  if (_inputString.Length > 0)
          _inputString = _inputString.Substring(0, _inputString.Length-1);
  }
  else if (keyPressed == "Space")
  {
        // Add a space
        _inputString += " ";
      }
  else if (keyPressed == "Enter" || keyPressed == "Done")
  {
        // Change screens, or do whatever you want to 
        // do when your user has finished typing :-)
      }
  else if (keyPressed == "Caps")
  {
  // Toggle the capslock state yourself
  osk.SetShiftState(osk.GetShiftState() == ShiftState.CapsLock ? ShiftState.Off : ShiftState.CapsLock);
      }
  else if (keyPressed == "Shift")
  {
  // Toggle shift state ourselves
  osk.SetShiftState(osk.GetShiftState() == ShiftState.Shift ? ShiftState.Off : ShiftState.Shift);
      }
  else
  {
        //限制输入
        if (_inputField.text.Length >= _inputField.characterLimit) return;
        // Add a letter to the existing string
        _inputString += keyPressed;
  }
      //将文字赋值给文本框中的文本属性
      _inputField.text = _inputString;
 
    }
 }
}

在场景中新建个空物体，用来放虚拟键盘脚本，再新建个输入文本框，脚本可以挂在画布上或者新建个空物体都行。把输入文本框赋上去就可以了。运行效果是这样的

当然，你想要各种风格之类的，换底图之类的，以及按键数量，都可以自行设置。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持自由互联。