Objective-C respondsToSelector

Question

From what I have learned so far: In Objective-C you can send any message to any object. If the object does implement the right method it will be executed otherwise nothing w

Answer 1

"This is because before the message is sent Objective-C will perform respondsToSelector."

I guess this is not correct. If the object does not respond to selector, it will crash at runtime. There is no automatic checking by the system. If there was a check by the run time system then we should never get "unrecognized selector sent to instance" exception.

Please make me correct if I am wrong.

EDIT: This is not a straight forward crash, but the default result is the process will be terminated. The whole sequence is already explained in comment and other answer, so I am not going to write that again.