Fetched Result Controller delegate not called after swift 1.2 / xcode 6.3 update

Question

I just upgraded my project to swift 1.2. And after 5 or 6 consecutive 'Convert to latest Swift' action :), i was able to make it compiles. Then i had lot's of my UI test failing. It was due to the fact that my 'NSFetchedResultsControllerDelegate' was not called any more.

After (i might say) a very lucky attempt, i found that it as due to the fact that my delegate was not a NSObject. So i was able to fix it by subclassing NSObject or adding @obj.

Before:

class BasicFetchedResultControllerDelegate : NSFetchedResultsControllerDelegate

After:

class BasicFetchedResultControllerDelegate : NSObject, NSFetchedResultsControllerDelegate

I don't think i saw something related to this in the change log. What is the changes that lead to that. Did you notice other changes like this?

Answer 1

I received this from Apple after i filled up a bug report:

This issue behaves as intended based on the following:

This is a behavior change in Swift 1.2: methods in non-Objective-C-derived classes will no longer be implicitly marked @objc even if they match an Objective-C protocol. You can explicitly mark the methods with the @objc attribute if you don't want to extend NSObject. This is described in the Xcode 6.3 release notes at https://developer.apple.com/library/ios/releasenotes/DeveloperTools/RN-Xcode/Chapters/xc6_release_notes.html#//apple_ref/doc/uid/TP40001051-CH4-SW3.