ORKCountdownStep Class Reference

Inherits from	ORKActiveStep : ORKStep : NSObject
Declared in	ORKCountdownStep.h ORKCountdownStep.m

Overview

The ORKCountdownStep class represents a step that displays a label and a countdown for a time equal to its duration.

To use the countdown step, set the duration property, incorporate it into a task, and present the task with a task view controller.

The countdown step is used in most of ResearchKit’s predefined active tasks.

`+ stepViewControllerClass`

+ (Class)stepViewControllerClass

Declared In

ORKStep.h

`– initWithIdentifier:`

- (instancetype)initWithIdentifier:(NSString *)identifier

Declared In

ORKStep.h

`– validateParameters`

Checks the parameters of the step and throws exceptions on invalid parameters.

- (void)validateParameters

Discussion

This method is called when there is a need to validate the step’s parameters, which is typically the case when adding a step to an ORKStepViewController object, and when presenting the step view controller.

Subclasses should override this method to provide validation of their additional properties, and must call super.

Declared In

ORKStep.h