Completion block that determines if a challenge has been issued and if so, who it is sent to.
- iOS 7.0+
- macOS 10.10+
- tvOS 9.0+
- watchOS 3.0+
The block parameters are defined as follows:
View controller for the challenge.
Boolean variable designating if the challenge was sent out.
An array of
GKPlayerobjects containing the player identifiers that the challenge was sent to.