问题
Quick help has gone away in my Xcode 5 (5.0.2 on OS X 10.8.5):
Instead of the little popup window that's supposed to pop up for the Opt - Click shortcut all that ever shows is the arrow image:
Been like this since the Xcode 5 upgrade. Any ideas how to fix it..?
FWIW: The doc sets are in fact properly installed - 'Opt' + Double-Click brings up the correct documentation as usual. Even removing the doc sets manually and re-downloadig didn't help.
The hovering Quick Help window is still gone..
回答1:
Quick Help behaves this way if JavaScript is disabled, and certain configurations seem to cause Xcode to write a user default disabling JavaScript following the upgrade. To fix it, delete the user default by running the following command from Terminal, then relaunch Xcode.
defaults delete com.apple.dt.Xcode WebKitJavaScriptEnabled
回答2:
Close Xcode then delete ~/Library/Caches/com.apple.dt.Xcode.
Reopen Xcode and option click on whatever you were interested in.
It seems to take a bit of time to be available after deleting the above directory. I option clicked a couple of things and after the third click it started working. Be patient!
Working for me on Xcode 8.2.1
回答3:
Matt's answer didn't work for me. The below code worked. Run the following command from Terminal, then relaunch Xcode.
defaults delete com.apple.dt.Xcode IDEIndexDisable
回答4:
It started working (Xcode 8.1) after I did go to: Xcode -> Preferences -> Components -> Switch to Documentation (if you are on Simulators)
Hit the download the documentation button.
I did need to restart Xcode and also hit the Check and Install Now button. Before this it was not working.
回答5:
I just had this issue yesterday. It happened after I disconnected my iPhone from my computer, the target device switched to "Generic iOS Devices". All of a sudden, quick help stopped working, the symbols lost their icons in the auto-completion pop-up.
I just tried select any of the simulator device to get it working again. Or you can just reconnect your iOS device.
来源：https://stackoverflow.com/questions/20945758/no-more-quick-help-in-xcode-editor