The result of the invocation or method.
- iOS 2.0+
- macOS 10.5+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
The object returned by the method or an
NSValue object containing the return value if it is not an object.
nil if the method or invocation is not finished executing.
If an exception was raised during the execution of the method or invocation, accessing this property raises that exception again. If the operation was cancelled or the invocation or method has a
void return type, accessing this property raises an exception; see Result Exceptions.