Unity实现多平台二维码扫描

在unity里做扫二维码的功能，虽然有插件，但是移动端UI一般不能自定义，所以后来自已做了一个，直接在c#层扫描解析，UI上就可以自己发挥了。

上代码：

这个是调用zxing的脚本。

using UnityEngine;
using System.Collections;
using ZXing;
using ZXing.QrCode;

public class QR {
/// <summary>
/// 解析二维码
/// </summary>
/// <param name="tex"></param>
/// <returns></returns>
public static string Decode(Texture2D tex) {
return DecodeColData(tex.GetPixels32(), tex.width, tex.height); //通过reader解码
}
public static string DecodeColData(Color32[] data, int w, int h) {
BarcodeReader reader = new BarcodeReader();
Result result = reader.Decode(data, w, h); //通过reader解码
//GC.Collect();
if (result == null)
return "";
else {
return result.Text;
}
}
/// <summary>
/// 生成二维码
/// </summary>
/// <param name="content"></param>
/// <param name="len"></param>
/// <returns></returns>
public static Texture2D GetQRTexture(string content, int len = 256) {
var bw = new BarcodeWriter();
bw.Format = BarcodeFormat.QR_CODE;
bw.Options = new ZXing.Common.EncodingOptions() {
Height = len,
Width = len
};
var cols = bw.Write(content);
Texture2D t = new Texture2D(len, len);
t.SetPixels32(cols);
t.Apply();
return t;
}
}

然后是封装：

using UnityEngine;
using System.Collections;
using System;
using UnityEngine.UI;
using System.Timers;
/// <summary>
/// 二维码解析工具
/// 关键函数:
///   public static QRHelper GetInst()                   --得到单例
///   public event Action<string> OnQRScanned;               --扫描回调
///   public void StartCamera(int index)                  --启动摄像头
///   public void StopCamera()                       --停止摄像头
///   public void SetToUI(RawImage raw,int UILayoutW,int UILayoutH)     --把摄像机画面设置到一个rawimage上并使它全屏显示
/// </summary>
public class QRHelper {

public event Action<string> OnQRScanned;

private static QRHelper _inst;
public static QRHelper GetInst() {
if (_inst == null) {
_inst = new QRHelper();
}
return _inst;
}
private int reqW = 640;
private int reqH = 480;
private WebCamTexture webcam;

Timer timer_in, timer_out;
/// <summary>
/// 启动摄像头
/// </summary>
/// <param name="index">手机后置为0，前置为1</param>
public void StartCamera(int index) {
StopCamera();
lock (mutex) {
buffer = null;
tbuffer = null;
}
var dev = WebCamTexture.devices;
webcam = new WebCamTexture(dev[index].name);
webcam.requestedWidth = reqW;
webcam.requestedHeight = reqH;
webcam.Play();
stopAnalysis = false;

InitTimer();
timer_in.Start();
timer_out.Start();
}
/// <summary>
/// 停止
/// </summary>
public void StopCamera() {
if (webcam!=null) {
webcam.Stop();
UnityEngine.Object.Destroy(webcam);
Resources.UnloadUnusedAssets();
webcam = null;
stopAnalysis = true;

timer_in.Stop();
timer_out.Start();
timer_in = null;
timer_out = null;
}
}
/// <summary>
/// 把摄像机画面设置到一个rawimage上并使它全屏显示
/// </summary>
/// <param name="raw">rawimage</param>
/// <param name="UILayoutW">UI布局时的宽度</param>
/// <param name="UILayoutH">UI布局时的高度</param>
public void SetToUI(RawImage raw,int UILayoutW,int UILayoutH){
raw.GetComponent<RectTransform>().sizeDelta = GetWH(UILayoutW,UILayoutH);
int d = -1;
if (webcam.videoVerticallyMirrored) {
d = 1;
}
raw.GetComponent<RectTransform>().localRotation *= Quaternion.AngleAxis(webcam.videoRotationAngle, Vector3.back);
float scaleY = webcam.videoVerticallyMirrored ? -1.0f : 1.0f;
raw.transform.localScale = new Vector3(1, scaleY * 1, 0.0f);
raw.texture = webcam;
raw.color = Color.white;
}
//在考虑可能旋转的情况下计算UI的宽高
private Vector2 GetWH(int UILayoutW, int UILayoutH) {
int Angle = webcam.videoRotationAngle;
Vector2 init = new Vector2(reqW, reqH);
if ( Angle == 90 || Angle == 270 ) {
var tar = init.ScaleToContain(new Vector2(UILayoutH,UILayoutW));
return tar;
}
else {
var tar = init.ScaleToContain(new Vector2(UILayoutW, UILayoutH));
return tar;
}
}
private void InitTimer() {
timer_in = new Timer(500);
timer_in.AutoReset = true;
timer_in.Elapsed += (a,b) => {
ThreadWrapper.Invoke(WriteDataBuffer);
};
timer_out = new Timer(900);
timer_out.AutoReset = true;
timer_out.Elapsed += (a,b)=>{
Analysis();
};
}
private Color32[] buffer = null;
private Color32[] tbuffer = null;
private object mutex = new object();
private bool stopAnalysis = false;

int dw, dh;
private void WriteDataBuffer() {
lock (mutex) {
if (buffer == null && webcam!=null) {
buffer = webcam.GetPixels32();
dw = webcam.width;
dh = webcam.height;
}
}
}
//解析二维码
private void Analysis() {
if (!stopAnalysis) {
lock (mutex) {
tbuffer = buffer;
buffer = null;
}
if (tbuffer == null) {
;
}
else {
string str = QR.DecodeColData(tbuffer, dw, dh);
tbuffer = null;
if (!str.IsNullOrEmpty() && OnQRScanned != null) {
ThreadWrapper.Invoke(() => {
if (OnQRScanned!=null)
OnQRScanned(str);
});
}
}
}
tbuffer = null;
}
}

调用方式如下，用了pureMVC，可能理解起来有点乱，也不能直接用于你的工程，主要看OnRegister和OnRemove里是怎么启动和停止的，以及RegQRCB、RemoveQRCB、OnQRSCcanned如何注册、移除以及响应扫描到二维码的事件的。在onregister中，由于ios上画面有镜象，所以把rawimage的scale的y置为了-1以消除镜像：

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using PureMVC.Patterns;
using PureMVC.Interfaces;
/// <summary>
/// 扫描二维码界面逻辑
/// </summary>
public class ScanQRMediator : Mediator {

AudioProxy audio;
public QRView TarView {
get {
return base.ViewComponent as QRView;
}
}
public ScanQRMediator()
: base("ScanQRMediator") {
}
string NextView = "";
bool isInitOver = false;
int cameraDelay = 1;
public override void OnRegister() {
base.OnRegister();

if (Application.platform == RuntimePlatform.IPhonePlayer) {
cameraDelay = 5;
}
else {
cameraDelay = 15;
}

audio = AppFacade.Inst.RetrieveProxy<AudioProxy>("AudioProxy");

TarView.BtnBack.onClick.AddListener(BtnEscClick);

QRHelper.GetInst().StartCamera(0);
TarView.WebcamContent.rectTransform.localEulerAngles = Vector3.zero;
CoroutineWrapper.EXEF(cameraDelay, () => {
RegQRCB();
QRHelper.GetInst().SetToUI(TarView.WebcamContent, 1536, 2048);
if (Application.platform == RuntimePlatform.IPhonePlayer) {
TarView.WebcamContent.rectTransform.localScale = new Vector3(1, -1, 0);
}
isInitOver = true;
});
UmengStatistics.PV(TarView);
//暂停背景音乐
audio.SetBGActive(false);
}

public override void OnRemove() {
base.OnRemove();
TarView.BtnBack.onClick.RemoveListener(BtnEscClick);
if (NextView != "UnlockView") {
audio.SetBGActive(true);
}
NextView = "";
isInitOver = false;
}
bool isEsc = false;
void BtnEscClick() {
if (isEsc || !isInitOver) {
return;
}
isEsc = true;

TarView.WebcamContent.texture = null;
TarView.WebcamContent.color = Color.black;
RemoveQRCB();
QRHelper.GetInst().StopCamera();

CoroutineWrapper.EXEF(cameraDelay, () => {
isEsc = false;
if (Application.platform == RuntimePlatform.IPhonePlayer) {
ToUserInfoView();
}
else {
string origin = TarView.LastArg.SGet<string>("origin");
if (origin == "ARView") {
ToARView();
}
else if (origin == "UserInfoView") {
ToUserInfoView();
}
else {
ToARView();
}
}
});
}
void ToARView() {
AppFacade.Inst.RemoveMediator(this.MediatorName);
ViewMgr.GetInst().ShowView(TarView, "ARView", null);
}
void ToUserInfoView() {
AppFacade.Inst.RemoveMediator(this.MediatorName);
ViewMgr.GetInst().ShowView(TarView, "UserInfoView", null);
var v = ViewMgr.GetInst().PeekTop();
var vc = new UserInfoMediator();
vc.ViewComponent = v;
AppFacade.Inst.RegisterMediator(vc);
}
int reg = 0;
void RegQRCB() {
if (reg == 0) {
QRHelper.GetInst().OnQRScanned += OnQRScanned;
reg = 1;
}
}
void RemoveQRCB() {
if (reg == 1) {
QRHelper.GetInst().OnQRScanned -= OnQRScanned;
reg = 0;
}
}
bool isQRJump = false;
void OnQRScanned(string qrStr) {
if (isQRJump) {
return;
}
isQRJump = true;

TarView.WebcamContent.texture = null;
TarView.WebcamContent.color = Color.black;
RemoveQRCB();
QRHelper.GetInst().StopCamera();
NextView = "UnlockView";
CoroutineWrapper.EXEF(cameraDelay, () => {
isQRJump = false;
AppFacade.Inst.RemoveMediator(this.MediatorName);
audio.PlayScanedEffect();
#if YX_DEBUG
Debug.Log("qr is :"+qrStr);
Toast.ShowText(qrStr,1.5f);
#endif
ViewMgr.GetInst().ShowView(TarView, "UnlockView", HashtableEX.Construct("QRCode", qrStr, "origin", TarView.LastArg.SGet<string>("origin")));
var v = ViewMgr.GetInst().PeekTop();
var vc = new UnlockMediator();
vc.ViewComponent = v;
AppFacade.Inst.RegisterMediator(vc);
});
}
}

最后，放上zxing.unity.dll,放在plugins里就可以了。

以上代码5.1.2测试可用。

以上就是本文的全部内容，希望对大家的学习有所帮助

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