在使用Xcode时，因为内存不足导致异常重启。重启Mac后，Xcode运行模拟器，提示：
The com.apple.CoreSimulator.SimRuntime.iOS-17-5 simulator runtime is not available.
runtime profile not found using "System" match policy Download the com.apple.CoreSimulator.SimRuntime.iOS-17-5 simulator runtime from the Xcode Settings. Please also attach the results from running: xcrun simctl diagnose when reporting this issue.该报错表示 iOS 17.5 模拟器运行时（runtime）丢失或损坏。通常发生在以下几种情况：
1、mac意外重启或断电时，Xcode 的 runtime 文件（放在 /Library/Developer/CoreSimulator/Profiles/Runtimes/）被破坏；
2、Xcode 更新中断，导致 runtime 没有正确安装；
3、系统清理工具（比如 CleanMyMac）误删了模拟器的运行环境。
解决方案
重启Mac，问题得到解决。
参考文章
1、Xcode device Unavailable, runtime profile not found：https://stackoverflow.com/questions/44180364/xcode-device-unavailable-runtime-profile-not-found
2、Resolving a “Simulator runtime is not available” error：https://developer.apple.com/forums/thread/751135
