Use Xcode 8 with iOS 11

Solution 1:

As of now this is only for Debugging on iOS device, not Simulator

Xcode 8 could not support unless you have the DeviceSupport folder for the iOS 11 version.

1. You can download a Xcode 9 beta (latest Xcode 9) or get an DeviceSupport folder from other user.

2. Simply copy it to your folder or create an symbolic link

sudo ln -s /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/11.0\ \(15A372\) /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/11.0

reference: Use Xcode 7 with iOS 10

Solution 2:

Check this out: As of now this is only for Debugging on iOS device not Simulator

1. Download the SDK from Apple
2. Copy this iOS 11.0 image file to: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/
3. Restart Xcode.

Solution 3:

I did this and it's fine, I still work both on comercial app using Xcode 8 + Swift 3 and exploring Xcode 9 beta with Swift 4. Just download the Xcode 9 and, inside Xcode 8 preferences, set the Command Line Tools to use the 9.0.