更新Xcode11后因为缺少libstdc++.6.dylib文件报错，按照Xcode10的方法设置后运行模拟器发现还是报错，错误如下：
Reason: no suitable image found. Did find:
/usr/lib/libstdc++.6.dylib: mach-o, but not built for iOS simulator
根据原来Xcode10的设置方法，需要将就Xcode的如下路径的libstdc++.6.0.9.dylib、libstdc++.6.dylib、libstdc++.dylib三个文件拷贝到新的Xcode对应路径中，路径如下：
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/libstdc++.6.0.9.dylib
但是发现Xcode11的/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library路径中并没有CoreSimulator文件夹，所以无法设置。
查找资料后发现Xcode11的CoreSimulator文件夹被移至到/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/这个路径下，所以将旧的Xcode中的libstdc++.6.0.9.dylib、libstdc++.6.dylib、libstdc++.dylib三个文件移至新目录下就可以解决上述问题。路径如下：
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/
