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New FeaturesThe compiler supports this flag with deployment targets of macOS 11, iOS and iPadOS 14, tvOS 14, watchOS 7 and later. The flag is enabled by default.
The Xcode 12 release supports on-device debugging for iOS 9 and later, tvOS 9 and later, and watchOS 2 and later. Xcode 12 requires an Intel-based Mac running macOS Catalina 10.15.
Xcode is a complete developer toolset for creating apps for Mac, iPhone, iPad, Apple Watch, and Apple TV.
Xcode doesn't support iOS 15.
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.
You can download a Xcode 9 beta (latest Xcode 9) or get an DeviceSupport folder from other user.
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
Check this out: As of now this is only for Debugging on iOS device not Simulator
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.
I preferred to copy ALL the folder:
/Volumes/**HighSierra**/Applications/Xcode-**beta.app**/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/11.0\ \(15A5278f\)
to:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/**11**
I can confirm I can run on my iPhone 7 with iOS 11
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