Xcode 15.3中iOS Simulator周期性消失，求非重启解决方法？

我的iOS Simulator会周期性消失：

重启或注销再登录可解决该问题，但相关设备类型目录（如/Applications/Xcode-15.3.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/DeviceTypes/iPad Air (4th generation).simdevicetype/Contents/MacOS/iPad Air (4th generation)）均正常存在，实际设备类型文件数量充足：

drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad (10th generation).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad (5th generation).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad (6th generation).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad (7th generation).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad (8th generation).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad (9th generation).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad Air (3rd generation).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad Air (4th generation).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad Air (5th generation).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad Air 2.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad Pro (10.5-inch).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad Pro (11-inch) (1st generation).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad Pro (11-inch) (2nd generation).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad Pro (11-inch) (3rd generation).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad Pro (11-inch) (4th generation) (16GB).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad Pro (11-inch) (4th generation).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad Pro (12.9-inch) (1st generation).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad Pro (12.9-inch) (2nd generation).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad Pro (12.9-inch) (3rd generation).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad Pro (12.9-inch) (4th generation).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad Pro (12.9-inch) (5th generation).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad Pro (12.9-inch) (6th generation) (16GB).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad Pro (12.9-inch) (6th generation).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad Pro (9.7-inch).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad mini (5th generation).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad mini (6th generation).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPad mini 4.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone 11 Pro Max.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone 11 Pro.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone 11.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone 12 Pro Max.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone 12 Pro.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone 12 mini.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone 12.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone 13 Pro Max.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone 13 Pro.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone 13 mini.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone 13.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone 14 Plus.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone 14 Pro Max.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone 14 Pro.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone 14.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone 15 Plus.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone 15 Pro Max.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone 15 Pro.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone 15.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone 6s Plus.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone 6s.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:46 iPhone 7 Plus.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:46 iPhone 7.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone 8 Plus.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone 8.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone SE (1st generation).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:46 iPhone SE (2nd generation).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone SE (3rd generation).simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone X.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone Xs Max.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone Xs.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPhone Xʀ.simdevicetype
drwxr-xr-x   3 agraph  staff    96 Feb  4 02:47 iPod touch (7th generation).simdevicetype

另外，/Library/Developer/CoreSimulator/Images/ 目录内容如下：

drwxr-xr-x@ 7 root  admin         224 Apr 12 18:50 .
drwxr-xr-x  7 root  admin         224 Aug  3  2023 ..
-rw-------  1 root  admin  7351124481 Jan  9 16:10 00470611-A65E-4C90-9320-B17E3DC07E08.dmg
-rw-------  1 root  admin  7229057541 Mar  6 15:38 400CE2B6-8AB0-44F8-939A-290B35DCBE8D.dmg
drwxr-xr-x  2 root  admin          64 Mar  6 15:38 Inbox
-rw-r--r--  1 root  admin        2244 Apr 12 18:50 images.plist
drwxr-xr-x  2 root  admin          64 Mar  6 15:38 mnt

（/Library/Developer/CoreSimulator/Images/mnt/ 目录内为空）

替代解决方法 #

1. 重启CoreSimulator服务 #

打开终端，执行命令强制重启CoreSimulator核心服务：

killall -9 com.apple.CoreSimulator.CoreSimulatorService

执行后重新打开Xcode，模拟器设备列表通常会自动重新加载。

2. 重置模拟器设备（需注意备份数据） #

• 图形界面操作：
  打开Xcode，点击顶部菜单 Window > Devices and Simulators，在Simulators标签页选中所有消失的设备，右键选择Delete，再点击左下角+按钮重新添加需要的设备类型。
• 终端命令重置：
  执行以下命令清除所有模拟器数据（会删除模拟器内的应用、设置等，建议提前备份）：

  xcrun simctl erase all
  xcrun simctl delete all
  

  之后重新打开Xcode即可重新创建模拟器。

3. 清理Xcode缓存并重新加载配置 #

关闭Xcode和所有模拟器窗口，执行命令删除Xcode缓存文件：

rm -rf ~/Library/Caches/com.apple.dt.Xcode
rm -rf ~/Library/Developer/Xcode/DerivedData

重新打开Xcode，等待索引完成后查看模拟器是否恢复正常。

4. 修复CoreSimulator目录权限 #

执行命令修复/Library/Developer/CoreSimulator/目录的权限问题：

sudo chown -R root:admin /Library/Developer/CoreSimulator
sudo chmod -R 755 /Library/Developer/CoreSimulator

输入系统密码后执行，完成后重新打开Xcode验证。

内容的提问来源于stack exchange，提问作者Anton Tropashko