# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2017-02-12 15:59:26 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/830808542764482560) Does anyone have a working use of a CIConvolution3X3 CIFilter in Swift? Can't get the damn thing to work! #iOSDev #swiftlang