I'm currently working on a medical research app with swift based on ResearchKit, which is an objective-c based framework. I'm trying to create a conditional ORKOrderedTask, like the one at: https://gist.github.com/mattio/9126ecc4f08b9f0497d9 Basically, it says that if the answer to the previous question is yes, then display the next question, if not, skip it. I can find the code for it in objective-c but I'm having trouble converting it to swift.
The recently merged ORKNavigableOrderedTask provides that exact functionality by means of using NSPredicates to check against previous or ongoing task results.
In the RKNavigableTaskExample repository you can find a small self-contained example on how to use the class. The example is written in Objective-C, but it should be easy to call the same APIs from Swift.