If the receiver hasn’t already done so, retains the target and all object arguments of the receiver and copies all of its C-string arguments and blocks. If a returnvalue has been set, this is also retained or copied.
A C string encoding the return type of the method in Objective-C type encoding.
This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.