“Xcode” is damaged and can’t be opened. You should move it to the Trash

Question

Installed XCode 6 on Mavericks. It din\'t run. Updated OS to Yosemite 10.10 : Now Xcode.app (installed through *.dmg) launch fails wit

Answer 1

I have just experienced this with Xcode 6.1.1 on Yosemite, except it only happened when I build and run in the simulator - on app launch Xcode would crash and a panel would declare "Xcode is damaged. Delete it and download again from the App Store".

I did all of the following to solve it:

• Delete derived project data and full clean
• Delete app from simulator and quit simulator
• Reboot

Anyway just in case this helps a new visitor to this question :)