Debugging Quicklook Plugin in Xcode

I am trying to debug a quicklook plugin in Xcode 4.6. I have created the executable in Edit Scheme.

Now, when I build the project the plugin is not installed to the "/Library/Quicklook" path. Rather I didn't find it anywhere.

I want to run the plugin in debug mode and want to hit the breakpoints so that I can figure out where the plugin crashes on different files.

Solution

You can use brake points and NSLog function for debugging QL plugin. But first you need to configure environment.

Select your project on Project Navigator
Then select QL plugin target
Go to 'Build Phases' tab and add new phase 'Copy files'
Select 'Absolute Path' on destination drop down menu and set ~/Library/QuickLook as subpath
Open terminal and copy qlmanage to your project's root directory with command cp /usr/bin/qlmanage PROJECT_ROOT_DIR
Then select menu Product -> Scheme -> Edit Scheme...
Select 'Run' on schemes list
On info tab select executable drop down menu, then 'Other...' and select qlmanage binary you have copied to project's root directory
On arguments tab add row for 'Arguments Passed On Launch' and set value to -p FULL_PATH_TO_FILE_FOR_PREVIEW

After all steps you can run your project and debug your code.