Cannot insert new outlet connection

I realized that by turning intexation back on fixes the issue. But I do not understand how is it related to the Outlet connection feature.

I use the following command line in the terminal to activate/deactivate indexation: defaults write com.apple.dt.XCode IDEIndexDisable 0

Just an assumption here.

Without indexing, XCode cannot find the references needed to connect the Outlet.

As described here, no-indexing limits some functions :

Indexing is done in the background; the Activity View indicates when indexing is being performed. Until the index is ready, some functions that require the index may not be available (for example, Open Quickly); others may have degraded performance (for example, syntax coloring of system symbols). When the index is complete these features become available immediately.

http : / / way2ios.com/development/ios-development-2/iphone-2/xcode-4-x_slow_issues/

Thanks for the reply Claude.

So are you assuming that this is why the Outlets would not connecting?

I had the intexing off and still was able to connect outlets until it suddenly stopped.

But on the other hand as soon as I activated the indexing it fixed the issue.

You may have changed from a connection that Xcode was using from a previous index, still stuck in it's mind, that was corrected by a new index.

Since Xcode loves to hang on to old info at times, an option-clean build folder (/Product menu w/option pressed) helps to flush the old and build new.

Product > Clean command helped me to solve the problem.

Clean and Opt-Clean do not work for me!

Xcode 9

I have a Table View, created a custom cell view and now can not add new outlets to the custom cell. The single original outlet to a label before I switch the class still works. Just can not add new UI to the custom cell