checkAvailability

Purpose

Checks whether the TouchId functionality is available and the passcode is set.

checkAvailability( callback )

This method does not return anything.

Name	Description	Type	Use
callback	Registered to verify if the TouchId functionality is available and the passcode is set.	`undefined`	required

The checkAvailability method's callback object can be structured as follows:

{
	onSuccess: function(success) { ... }
}

Name	Description	Return type
onSuccess	This method is called when the TouchId's availability is successfully verified. Its parameter is a boolean value, which is "true" if TouchId is available and the password is set.	`undefined`