错误截图：

IndexOutOfRangeException: Array index is out of range.
ZXing.Color32Renderer.Render (ZXing.Common.BitMatrix matrix, BarcodeFormat format, System.String content, ZXing.Common.EncodingOptions options)
ZXing.BarcodeWriterGeneric`1[TOutput].Write (System.String contents)
UITest.Encode (System.String textForEncoding, Int32 width, Int32 height) (at Assets/UITest.cs:112)
UITest.CreatQRCodeImage (UnityEngine.Texture2D encoded, System.String textForEncoding) (at Assets/UITest.cs:119)

解决办法：

将要生成的二维码的图片如图设置

Texture Type:Advanced

Read/Write Enable 勾选

Format：RGBA32 bit