ResearchKit: Change choices based on previous response

Question

Im working on Survey app using ResearchKit and I need to change the values of the next question based on the previous response. Example:

Question 1: How many cars do you have?
- 1 Car
- 2 Cars
- 3 Cars
- 4 Cars
- xx Cars

Question 2: Which is your favorite car?
 - car number 1
 - car number 2
 - car number 3
 - car number 4
 - car number XX

The number of options of the question 2 will based on the value selected on Question 1.

Any idea how can I do that?

score 1 · Accepted Answer · answered Oct 06 '15 at 11:53

I found out a solution, while it is not possible to create new steps after you presented the ViewController, It is possible to update answerFormat of a step using a new array

for(ORKQuestionStep* step in ((ORKOrderedTask*)self.task).steps) {
            if([step.answerFormat isKindOfClass:[ORKValuePickerAnswerFormat class]]) {
               step.answerFormat = [[ORKValuePickerAnswerFormat alloc] initWithTextChoices:arrayOfChoices];
            }
        }

score 1 · Answer 2 · answered Oct 06 '15 at 15:53

1

Have a look at ORKNavigableOrderedTask. (See ORKTest for an usage example.)

Basically, you'd define individual steps for all the different options on the first question, and then conditionally navigate to the appropriate step based on its answer.

answered Oct 06 '15 at 15:53

Ricardo Sanchez-Saez

9,466
8
53
92

That is a good option, but I could not use it, since the user could have an infinite number of cars and I could not produce a step of each option. – FelipeOliveira Oct 07 '15 at 21:28
@FelipeOliveira : have you found any solution ? ResearchKit looks more like static solution then dynamic solution as you have mentioned ! – Bishal Ghimire Feb 24 '16 at 08:52
see my answer bellow @BishalGhimire – FelipeOliveira May 30 '16 at 19:47

score 0 · Answer 3 · answered Nov 12 '17 at 01:54

0

You can also use:

func step(after step: ...) and
func step(before step: ...)

Using these you can create the steps themselves on-the-fly. However you also lose some other functionality and have to manage all the navigation yourself.

answered Nov 12 '17 at 01:54

David Reich

709
6
14

ResearchKit: Change choices based on previous response

3 Answers3