Unity生成二维码，ZXing库

需要用到一个生成二维码的库：ZXing.Net

github例子工程：https://github.com/linmq/ZXing_Unity3D_Test

工程中的plugins目录引入zxing的库

封装一下C#接口

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

public class QRCodeUtils
{   
    //给UITexture设置生成的二维码图
    public static void SetQrCode(string textForEncoding, UITexture uiTex)
    {
        uiTex.width = 256;
        uiTex.height = 256;
        var encoded = new Texture2D(uiTex.width, uiTex.height);
        var colors = Encode(textForEncoding, encoded.width, encoded.height);
        encoded.SetPixels32(colors);  
        encoded.Apply();  
        
        uiTex.mainTexture = encoded;
    }
    
    private static Color32[] Encode(string textForEncoding, int width, int height)  
    {  
        var writer = new BarcodeWriter  
        {  
            Format = BarcodeFormat.QR_CODE,  
            Options = new QrCodeEncodingOptions  
            {  
                Height = height,  
                Width = width  
            }  
        };  
        return writer.Write(textForEncoding);  
    }  
}  

默认生成的二维码颜色都是黑色的，如果想要生成别的颜色的二维码，只需要把Encode返回的Color32数组的值变换一下即可：

var targetColor = Color.green;
for(int i = 0, len = colors.Length; i < len; ++i)
{
    if(0 == colors[i].r)
    {
        colors[i] = targetColor;
    }
}