when I use the xcode for compiling the game what is built from unity , I notice that if I choose Unity-iPhone-simulator ,there are many errors ,after I choose the Unity-iPhone ,the project runs successfully , I want to know the reson about this . Thank you for the sharer!
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Somewhat related, from Unity IOS Basics:
As for why iPhone-Simulator fails, likely you are using an incorrect iPhone SDK. Try setting SDk version to 4.1.
The community at large seems to regard the Simulator builder as broken and that you should stick with native builds or using the Unity remote for testing. Some information sourced from here.