RSDStep

public protocol RSDStep

RSDStep is the base protocol for the steps that can compose a task for presentation using a controller appropriate to the device and application. Each RSDStep object represents one logical piece of data entry, information, or activity in a larger task.

Implementations included in this SDK include:

  1. RSDGenericStep is used by RSDFactory to create a step that does not include a recognized subtype.
  2. RSDSectionStep is used to define a logical subgroup of steps.
  3. RSDUIStep is used to define a display step.
  4. RSDTaskInfoStep is used to combine tasks into a single flow. For example, if the researcher wishes to ask for survey responses before an activity.

A step can be a question, an active test, or a simple instruction. An RSDStep subclass is usually paired with an RSDStepController that controls the actions of the step.

  • A short string that uniquely identifies the step within the task. The identifier is reproduced in the results of a step history.

    In some cases, it can be useful to link the step identifier to a unique identifier in a database; in other cases, it can make sense to make the identifier human readable.

    Declaration

    Swift

    var identifier: String { get }

  • The type of the step. This is used to decode the step using a RSDFactory. It can also be used to customize the UI.

    Declaration

    Swift

    var stepType: RSDStepType { get }

  • Instantiate a step result that is appropriate for this step.

    Declaration

    Swift

    func instantiateStepResult() -> RSDResult

    Return Value

    A result for this step.

  • Validate the step to check for any configuration that should throw an error.

    Throws

    An error if validation fails.

    Declaration

    Swift

    func validate() throws