使用Unity怎么实现一个虚拟键盘功能

使用Unity怎么实现一个虚拟键盘功能？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。

具体内容如下

usingUnityEngine;
usingSystem.Collections.Generic;

publicenumShiftState{Off,Shift,CapsLock}

publicclassOnScreenKeyboard:MonoBehaviour{

//INSPECTORVISIBLEPROPERTIES-------------------------------------------

//Skinning
publicGUIStyleboardStyle;
publicGUIStylekeyStyle;
publicTexture2DselectionImage;

//Boardandbuttonsizes
publicRectscreenRect=newRect(0,0,0,0);
publicVector2stdKeySize=newVector2(32,32);
publicVector2lgeKeySize=newVector2(64,32);

//Keyaudio
publicAudioClipkeySelectSound=null;
publicAudioClipkeyPressSound=null;

//Shiftsettings
publicboolshiftStateSwitchEnabled=true;
publicShiftStateshiftStateDefault=ShiftState.Off;

//Joysticksettings
publicbooljoystickEnabled=true;
publicstringjoyPressButton="Fire1";
publicstringjoyCapsButton="Fire2";

//Ourkeys.Bydefaultwe'llincludeasimplifiedQWERTYkeyboardhandy
//fornameentry,butthiscanliterallybeanythingyouwant.Eitherthe
//twoarraysmustbeofmatchinglength,orlowerKeysmustbeofsize0.
publicstring[]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"};

publicstring[]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"};

//Thesizemustmatchthenumberofrows,orbe0
publicfloat[]rowIndents={0.0f,0.2f,0.5f};

//Delaysforrepeatedevents
publicfloatinitialRepeatDelay=0.8f;
publicfloatcontinuedRepeatDelay=0.2f;
publicfloatmoveRepeatDelay=0.3f;


//INTERNALDATAMEMBERS--------------------------------------------------
privatestringkeyPressed="";
privateintpSelectedButton;

privateGUIStylepressedStyle=null;

privatefloatkeyRepeatTimer=0;
privateboolkeyDownPrevFrame=false;
privateboolkeyReleased=false;
privateboollastKeyWasShift=false;

privatefloatmoveTimer=0;

privateShiftStateshiftState;

privatebool[]keySizes;
privateRect[]keyRects;
privateint[]rowMarkers;

privateintselectedButton;

privateAudioSourcekeySelectSource=null;
privateAudioSourcekeyPressSource=null;

//Changethisifit'sconflictingwithyourownGUI'swindows
privateintwindowId=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---------------------------------------")]
publicfloat_keyBoardTF_X;
publicfloat_keyBoardTF_Y;



//INITIALISATION---------------------------------------------------------
voidAwake()
{
//Checkthatourkeyarraysizesmatch
if(upperKeys.Length!=lowerKeys.Length&&!(lowerKeys.Length==0&&!shiftStateSwitchEnabled))
{
print("Error:OnScreenKeyboardneedsthesamenumberofupperandlowercasekeys,ortheremustbenolowerkeysandcapsswitchmustbedisabled");
Destroy(this);
}

//Checkforrowmarkersandcountrowlengths
List<int>rowMarkersTemp=newList<int>();
for(inti=0;i<upperKeys.Length;i++)
if(upperKeys[i]=="<row>")rowMarkersTemp.Add(i);
rowMarkers=rowMarkersTemp.ToArray();

//Checkrowindents
if(rowIndents.Length<rowMarkers.Length+1)
{
float[]rowIndentsTemp=newfloat[rowMarkers.Length+1];
for(inti=0;i<rowIndentsTemp.Length;i++)
{
if(i<rowIndents.Length)rowIndentsTemp[i]=rowIndents[i];
elserowIndentsTemp[i]=0;
}
}

//Checkbuttonsizes-anythingthat'snotasinglecharacterisa"large"key
keySizes=newbool[upperKeys.Length];
for(inti=0;i<upperKeys.Length;i++)keySizes[i]=upperKeys[i].Length>1;

//Populatethearrayofkeyrectangles
keyRects=newRect[upperKeys.Length];
intcurrentRow=0;
floatxPos=(rowIndents.Length>0?rowIndents[currentRow]:0)+stdKeySize.x*0.33f;
floatyPos=stdKeySize.y*1.33f*currentRow+stdKeySize.y*0.33f;
for(inti=0;i<upperKeys.Length;i++)
{
//Onthestartofanewline,positionthenewkeyaccordingly
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
{
//Drawthekey,andsetkeyPressedaccordingly
keyRects[i]=newRect(screenRect.x+xPos,screenRect.y+yPos,keySizes[i]?lgeKeySize.x:stdKeySize.x,keySizes[i]?lgeKeySize.y:stdKeySize.y);

//Moveovertothenextkey'spositiononthisline
xPos+=keySizes[i]?lgeKeySize.x+stdKeySize.x*0.33f:stdKeySize.x*1.33f;
}
}

//Putourselvesinadefaultscreenpositionifwehaven'tbeenexplicitlyplacedyet
if(screenRect.x==0&&screenRect.y==0&&screenRect.width==0&&screenRect.height==0)
{
//Figureouthowbigweneedtobe
floatmaxWidth=0;
floatmaxHeight=0;
for(inti=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=newRect(_keyBoardTF_X,_keyBoardTF_Y,maxWidth,maxHeight);
}

//Ifwe'vegotaudio,createsourcessowecanplayit
if(keySelectSound!=null)
{
keySelectSource=gameObject.AddComponent<AudioSource>()asAudioSource;
keySelectSource.spatialBlend=0;
keySelectSource.clip=keySelectSound;
}
if(keyPressSound!=null)
{
keyPressSource=gameObject.AddComponent<AudioSource>()asAudioSource;
keyPressSource.spatialBlend=0;
keyPressSource.clip=keyPressSound;
}

//Settheinitialshiftstate
if(shiftStateSwitchEnabled)SetShiftState(shiftStateDefault);

//Createapressedbuttonskinforjoysticks
pressedStyle=newGUIStyle();
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;

}


//GAMELOOP--------------------------------------------------------------

voidUpdate()
{
//Handlekeysbeingreleased
if(!keyDownPrevFrame)
{
keyRepeatTimer=0;
if(!keyReleased)KeyReleased();
}
keyDownPrevFrame=false;

//Checkmouseinput
Vector3guiMousePos=Input.mousePosition;
guiMousePos.y=Screen.height-guiMousePos.y;
for(inti=0;i<keyRects.Length;i++)
{
RectclickRect=keyRects[i];
clickRect.x+=screenRect.x;clickRect.y+=screenRect.y;
//Checkfortheclickourself,becausewewanttodoitdifferentlytousual
if(clickRect.Contains(guiMousePos))
{
selectedButton=i;
if(Input.GetMouseButtonDown(0))KeyPressed();
elseif(Input.GetMouseButton(0))KeyHeld();
elseif(Input.GetMouseButtonUp(0))KeyReleased();
}
}

//Ifthejoystickisinuse,updateaccordingly
if(joystickEnabled)CheckJoystickInput();
}

privatevoidCheckJoystickInput()
{
//KEYSELECTION
floathoriz=Input.GetAxis("Horizontal");
floatvert=Input.GetAxis("Vertical");

moveTimer-=Time.deltaTime;
if(moveTimer<0)moveTimer=0;

boolhadInput=false;
boolmoved=false;
if(horiz>0.5f)
{
if(moveTimer<=0)
{
SelectRight();
moved=true;
}
hadInput=true;
}
elseif(horiz<-0.5f)
{
if(moveTimer<=0)
{
SelectLeft();
moved=true;
}
hadInput=true;
}
if(vert<-0.5f)
{
if(moveTimer<=0)
{
SelectDown();
moved=true;
}
hadInput=true;
}
elseif(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();
elseif(Input.GetButton(joyPressButton))KeyHeld();
}

//Calledonthefirstframewhereanewkeyispressed
privatevoidKeyPressed()
{
keyPressed=(shiftState!=ShiftState.Off)?upperKeys[selectedButton]:lowerKeys[selectedButton];
pSelectedButton=selectedButton;
keyRepeatTimer=initialRepeatDelay;

keyDownPrevFrame=true;
keyReleased=false;
lastKeyWasShift=false;

if(keyPressSource!=null)keyPressSource.Play();
}

//CalledforeveryframeAFTERthefirstwhileakeyisbeingheld
privatevoidKeyHeld()
{
//Ifthekeybeingpressedhaschanged,reverttoaninitialpress
if(selectedButton!=pSelectedButton)
{
KeyReleased();
KeyPressed();
return;
}

//Checkifwe'rereadytoreportanotherpressyet
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;
}

//Calledtheframeafterakeyisreleased
privatevoidKeyReleased()
{
keyDownPrevFrame=false;
keyReleased=true;

if(shiftState==ShiftState.Shift&&!lastKeyWasShift)
SetShiftState(ShiftState.Off);
}

//Selectsthekeytotheleftofthecurrentlyselectedkey
privatevoidSelectLeft()
{
selectedButton--;

//Ifwe'vehitthestartofarow,wraptotheendofitinstead
if(IsRowMarker(selectedButton)||selectedButton<0)
{
selectedButton++;
while(!IsRowMarker(selectedButton+1)&&selectedButton+1<upperKeys.Length)selectedButton++;
}
}

//Selectsthekeytotherightofthecurrentlyselectedkey
privatevoidSelectRight()
{
selectedButton++;

//Ifwe'vehittheendofarow,wraptothestartofitinstead
if(IsRowMarker(selectedButton)||selectedButton>=upperKeys.Length)
{
selectedButton--;
while(!IsRowMarker(selectedButton-1)&&selectedButton-1>=0)selectedButton--;
}
}

//Selectsthekeyabovethecurrentlyselectedkey
privatevoidSelectUp()
{
//Findthecenterofthecurrentlyselectedbutton
floatselCenter=keyRects[selectedButton].x+keyRects[selectedButton].width/2;

//Findthestartofthenextbutton;
inttgtButton=selectedButton;
while(!IsRowMarker(tgtButton)&&tgtButton>=0)tgtButton--;
if(IsRowMarker(tgtButton))tgtButton--;
if(tgtButton<0)tgtButton=upperKeys.Length-1;

//Findthebuttonwiththeclosestcenteronthatline
floatnDist=float.MaxValue;
while(!IsRowMarker(tgtButton)&&tgtButton>=0)
{
floattgtCenter=keyRects[tgtButton].x+keyRects[tgtButton].width/2;
floattDist=Mathf.Abs(tgtCenter-selCenter);
if(tDist<nDist)
{
nDist=tDist;
}
else
{
selectedButton=tgtButton+1;
return;
}
tgtButton--;
}
selectedButton=tgtButton+1;
}

//Selectsthekeybelowthecurrentlyselectedkey
privatevoidSelectDown()
{
//Findthecenterofthecurrentlyselectedbutton
floatselCenter=keyRects[selectedButton].x+keyRects[selectedButton].width/2;

//Findthestartofthenextbutton;
inttgtButton=selectedButton;
while(!IsRowMarker(tgtButton)&&tgtButton<upperKeys.Length)tgtButton++;
if(IsRowMarker(tgtButton))tgtButton++;
if(tgtButton>=upperKeys.Length)tgtButton=0;

//Findthebuttonwiththeclosestcenteronthatline
floatnDist=float.MaxValue;
while(!IsRowMarker(tgtButton)&&tgtButton<upperKeys.Length)
{
floattgtCenter=keyRects[tgtButton].x+keyRects[tgtButton].width/2;
floattDist=Mathf.Abs(tgtCenter-selCenter);
if(tDist<nDist)
{
nDist=tDist;
}
else
{
selectedButton=tgtButton-1;
return;
}
tgtButton++;
}
selectedButton=tgtButton-1;
}

//Returnstherownumberofaspecifiedbutton
privateintButtonRow(intbuttonIndex)
{
for(inti=0;i<rowMarkers.Length;i++)
if(buttonIndex<rowMarkers[i])returni;

returnrowMarkers.Length;
}


//GUIFUNCTIONALITY------------------------------------------------------

voidOnGUI()
{
GUI.Window(windowId,screenRect,WindowFunc,"",boardStyle);
}

privatevoidWindowFunc(intid)
{
for(inti=0;i<upperKeys.Length;i++)
{
if(!IsRowMarker(i))
{
//Drawaglowbehindtheselectedbutton
if(i==selectedButton)
GUI.DrawTexture(newRect(keyRects[i].x-5,keyRects[i].y-5,keyRects[i].width+10,keyRects[i].height+10),selectionImage);
//Drawthekey
//Notethatwedon'tdoclickdetectionhere,wedoitinupdate
GUI.Button(keyRects[i],(shiftState!=ShiftState.Off)?upperKeys[i]:lowerKeys[i],
(joystickEnabled&&selectedButton==i&&Input.GetButton(joyPressButton)?pressedStyle:keyStyle));
}
}
}

//Returnstrueiftheyitemataspecifiedindexisarowendmarker
privateboolIsRowMarker(intcurrentKeyIndex)
{
for(inti=0;i<rowMarkers.Length;i++)if(rowMarkers[i]==currentKeyIndex)returntrue;
returnfalse;
}


//CONTROLINTERFACE------------------------------------------------------

//Returnsthelatestkeytobepressed,ornullifnonewkeywaspressed
//sincelasttimeyouchecked.Thismeansthatyoucanonlygrabasingle
//keypressonce,asit'sclearedonceyou'vereadit.Italsomeansthat
//ifyoulettheuserpressmultiplekeysbetweenchecksonlythemost
//recentonewillbepickedupeachtime.
publicstringGetKeyPressed()
{
if(keyPressed==null)keyPressed="";

stringkey=keyPressed;
keyPressed="";
returnkey;
}

//Togglethecapsstatefromelsewhere
publicvoidSetShiftState(ShiftStatenewShiftState)
{
if(!shiftStateSwitchEnabled)return;

shiftState=newShiftState;
if(shiftState==ShiftState.Shift)lastKeyWasShift=true;
}

publicShiftStateGetShiftState(){returnshiftState;}
}

usingUnityEngine;
usingUnityEngine.UI;


///<summary>
///这是虚拟键盘插件脚本，June于2020.4.16改
///</summary>


publicclassOnScreenKeyboardExample:MonoBehaviour
{
publicOnScreenKeyboardosk;
///<summary>
///输入文字
///</summary>
privatestring_inputString;
///<summary>
///输入文本框
///</summary>
publicInputField_inputField;

//每次激活清空文本框内容
privatevoidOnEnable()
{
_inputString="";
}

voidUpdate()
{

//YoucanuseinputfromtheOSKjustbyaskingforthemostrecent
//pressedkey,whichwillbereturnedtoyouasastring,ornullif
//nokeyhasbeenpressedsinceyoulastchecked.Notethatifmore
//thanonekeyhasbeenpressedyouwillonlybegiventhemostrecent.
stringkeyPressed=osk.GetKeyPressed();
if(keyPressed!="")
{

//Takedifferentactiondependingonwhatkeywaspressed
if(keyPressed=="Backspace"||keyPressed=="<<")
{
//Removeacharacter
if(_inputString.Length>0)
_inputString=_inputString.Substring(0,_inputString.Length-1);
}
elseif(keyPressed=="Space")
{
//Addaspace
_inputString+="";
}
elseif(keyPressed=="Enter"||keyPressed=="Done")
{
//Changescreens,ordowhateveryouwantto
//dowhenyouruserhasfinishedtyping:-)
}
elseif(keyPressed=="Caps")
{
//Togglethecapslockstateyourself
osk.SetShiftState(osk.GetShiftState()==ShiftState.CapsLock?ShiftState.Off:ShiftState.CapsLock);
}
elseif(keyPressed=="Shift")
{
//Toggleshiftstateourselves
osk.SetShiftState(osk.GetShiftState()==ShiftState.Shift?ShiftState.Off:ShiftState.Shift);
}
else
{
//限制输入
if(_inputField.text.Length>=_inputField.characterLimit)return;
//Addalettertotheexistingstring
_inputString+=keyPressed;
}
//将文字赋值给文本框中的文本属性
_inputField.text=_inputString;

}
}
}

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