Unity打包Xcode真机测试的时候出现这个错误：
1 “(null)” is of a model that is not supported by this version of Xcode. Please use a different device
解决办法：重启Xcode,猜想Xcode没有读到设备。
2 validateRenderPassDescriptor:551: failed assertion `Texture at depthAttachment has usage (0x01) which doesn't specify MTLTextureUsageRenderTarget (0x04)'
解决办法：
