Cancels perform requests previously registered with the
perform instance method.
- iOS 2.0+
- macOS 10.2+
- tvOS 9.0+
- watchOS 2.0+
The target for requests previously registered with the
Selector: with Object: after Delay:
All perform requests having the same target
a are canceled. This method removes perform requests only in the current run loop, not all run loops.