Unity 4.7 导出工程在XCode9/10上报错 validateRenderPassDescriptor:644: failed assertion `Texture at colorAttachment[0] has usage (0x01) which doesn't specify MTLTextureUsageRenderTarget (0x04)'
报错发生时线程栈帧如下，发生在与Metal GPU图形渲染相关部分。

两种办法解决
1) Product -> Scheme -> Edit Scheme -> Run -> Options -> GPU Frame Capture -> OpenGL ES

2) Unity Other Setting -> Auto Graphics API 取消勾 –> OpenGLES2

Ref: https://blog.csdn.net/devday/article/details/79108873