SKProductSubscriptionPeriod
An object containing the subscription period duration information.
Declaration
class SKProductSubscriptionPeriodOverview
A subscription period is a duration of time defined as some number of units, where a unit can be a SKProduct.PeriodUnit.day, SKProduct.PeriodUnit.week, SKProduct.PeriodUnit.month, or SKProduct.PeriodUnit.year.
For example, a subscription period of two weeks has a unit of a SKProduct.PeriodUnit.week, and a numberOfUnits equal to 2.