以下是希望重现问题的人的一些步骤：

>一个新的空白Unity项目
> IOS播放器设置> SDK版本：模拟器SDK
当在模拟器中启动应用程序时,> Build and Run会产生此效果：

Warning: Error creating LLDB target at path ‘/Users/…(user
name)…/Library/Developer/Xcode/DerivedData/Unity-iPhone-couukthirzleocbdfmbmdpjhxrtr/Build/Products/Debug-iphonesimulator/ProductName.app’-
using an empty LLDB target which can cause slow memory reads from
remote devices.

dyld: Symbol not found: __ZN5Metal16g_CurrentEncoderE

Referenced from: /Users/…(user name)…/Library/Developer/CoreSimulator/Devices/530A44CB-5978-4926-9E91-E9DBD5BFB105/data/Containers/Bundle/Application/07612A5C-659D-4C04-ACD3-D211D2830E17/ProductName.app/ProductName

Expected in: flat namespace

in /Users/…(user name)…/Library/Developer/CoreSimulator/Devices/530A44CB-5978-4926-9E91-E9DBD5BFB105/data/Containers/Bundle/Application/07612A5C-659D-4C04-ACD3-D211D2830E17/ProductName.app/ProductName

然后,如果您在Xcode构建设置中选择标准体系结构并再次构建和运行,则会产生以下结果：

dyld: lazy symbol binding Failed: Symbol not found: _UnityRegisterProInterface

Referenced from: /Users/…(user name)…/Library/Developer/CoreSimulator/Devices/530A44CB-5978-4926-9E91-E9DBD5BFB105/data/Containers/Bundle/Application/444E88D1-3B5D-46FA-A143-B8634F56398E/ProductName.app/ProductName

Expected in: flat namespace

dyld: Symbol not found: _UnityRegisterProInterface

Referenced from: /Users/…(user name)…/Library/Developer/CoreSimulator/Devices/530A44CB-5978-4926-9E91-E9DBD5BFB105/data/Containers/Bundle/Application/444E88D1-3B5D-46FA-A143-B8634F56398E/ProductName.app/ProductName

Expected in: flat namespace

(lldb)

Unity iOS播放器设置中的各种设置会出现相同的结果：

>脚本后端：单声道(2.0)/ IL2CPP
>架构：ARMv7 / ARM64 / Universal
>目标iOS版本：6.0 / 8.1
>图形API：自动/开放GL ES 2.0 / Open GL ES 3.0 / Metal

使用Xcode Build Settings也可以获得相同的结果：

>基础SDK：iphonesimulator(未找到SDK)/标准架构(armv7,arm64) – $(ARCHS_STANDARD)
>支持的平台：iphonesimulator / iOS
> iOS部署目标：iOS 6.0 / iOS 8.1 / iOS 8.3

任何提示都非常感谢.