Unable to open liblaunch_sim.dylib. Try reinstalling Xcode or the simulator

关于Xcode7 Beta报错 simulator runtime is not available.

Unable to open liblaunch_sim.dylib Try reinstalling Xcode or the simulator runtime.

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解决办法

一、找到目标文件

/Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/lib/system/host/liblaunch_sim.dylib

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二、拷贝到目标地址一和目标地址二。

目标地址一

/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 8.1.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/host/liblaunch_sim.dylib

目标地址二

/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 8.2.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/host/liblaunch_sim.dylib

记得备份

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成功运行模拟器

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文章来自：http://www.cnblogs.com/songxing10000/p/4574236.html