更新后Xcode 9.3无法找到iOS 11.3模拟器求助

Hey there, let's work through this simulator issue you're hitting. Xcode 9.3 does support iOS 11.3, so the problem is likely tied to cached data or a glitch in the component download system. Here are a few actionable steps to get that simulator installed:

Step 1: Refresh Xcode Components & Clear Cache #

First, let's rule out a simple cache issue:

• Fully quit Xcode (make sure it's not running in the background—you can use Activity Monitor to double-check).
• Open Terminal and run this command to clear Xcode's cached data:

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

• Enter your system password when prompted, then restart Xcode. Head back to Preferences → Components and wait a minute for the list to refresh. Sometimes this kickstarts the component list to show the missing iOS 11.3 simulator.

Step 2: Manually Copy the Simulator Runtime #

If refreshing doesn't work, you can manually add the simulator runtime from another source:

• The simulator runtimes are stored at /Library/Developer/CoreSimulator/Profiles/Runtimes/ on your Mac.
• Find a colleague or friend who has Xcode 9.3 installed with the iOS 11.3 simulator, and ask them to copy the folder named something like iOS 11.3.simruntime to your computer's same path.
• Once copied, restart Xcode, then check Window → Devices and Simulators—the iOS 11.3 simulator should now appear in the list.

Step 3: Reinstall Xcode 9.3 #

As a last resort, if the above steps fail, try reinstalling Xcode 9.3:

• Delete your current Xcode app (drag it to Trash, then empty Trash).
• Grab the full Xcode 9.3 installation package from Apple's official developer download channel, install it fresh, then check the Components panel again for the iOS 11.3 simulator.

内容的提问来源于stack exchange，提问作者Abhinandan Pratap