Xcode 6.4 doesn't allow to debug on iOS 9 devices so i installed xcode 7 but it doesn't have iOS sdk 8.4 installed. Since I have a xcode 6.4 installation, i copied the
iPhoneOS8.4.sdk to the /Applications/Xcode 3.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs folder
and copied the
iPhoneSimulator8.4.sdk to /Applications/Xcode 3.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs.
However the iOS 8.4 sdk does not appear in the base sdk options list.
Xcode 3.app
? – trojanfoe.../SDKs
directory, in my case, called iPhoneOS9.1.sdk. I deleted it, and the problem solved. – Ge Liu