iOS17与Xcode15：模拟器及SwiftUI预览启动即崩溃求助

1. 彻底清理CoreSimulator缓存与权限 #

• 先关掉Xcode和所有模拟器相关进程：

  killall Xcode
  killall Simulator
  killall com.apple.CoreSimulator.CoreSimulatorService
  

• 删除CoreSimulator缓存目录，同时重置开发者目录权限：

  rm -rf ~/Library/Developer/CoreSimulator
  sudo chown -R $(whoami):staff ~/Library/Developer
  

• 重置模拟器设备列表：

  xcrun simctl erase all
  xcrun simctl list devices
  

2. 清理重复SDK并重新注册Xcode #

• 先检查是否存在重复的iOS SDK：

  ls /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs
  

• 如果看到多个iPhoneOS17*.sdk文件，只保留最新版本，删除其余（把下面命令里的iPhoneOS17.x.sdk换成实际要删的旧版本）：

  sudo rm -rf /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS17.x.sdk
  

• 重新注册Xcode命令行工具并初始化：

  sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
  xcodebuild -runFirstLaunch
  

3. 手动修复liblaunch_sim缺失问题 #

• 从Xcode的iOS Runtime包中复制缺失的文件到模拟器目录（自动匹配第一个iOS17模拟器设备）：

  SIM_DEVICE_ID=$(xcrun simctl list devices | grep "iOS 17" | head -n1 | awk '{print $4}' | tr -d '()')
  cp /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/liblaunch_sim.dylib ~/Library/Developer/CoreSimulator/Devices/$SIM_DEVICE_ID/data/usr/lib/system/
  

• 修复文件权限：

  sudo chmod 755 ~/Library/Developer/CoreSimulator/Devices/$SIM_DEVICE_ID/data/usr/lib/system/liblaunch_sim.dylib
  sudo chown root:wheel ~/Library/Developer/CoreSimulator/Devices/$SIM_DEVICE_ID/data/usr/lib/system/liblaunch_sim.dylib
  

4. 验证修复结果 #

• 重新打开Xcode，新建空白SwiftUI项目
• 尝试启动模拟器，检查SwiftUI预览是否正常加载
• 可以实时查看CoreSimulator日志确认错误是否消除：

  tail -f ~/Library/Logs/CoreSimulator/CoreSimulator.log
  

内容的提问来源于stack exchange，提问作者bacata.borisov