How to get rid of the 'undeclared selector' warning

Question

I want to use a selector on an NSObject instance without the need for an implemented protocol. For example, there\'s a category method that should set an error prop

Answer 1

You can also cast the object in question to an id first to avoid the warning:

if ([object respondsToSelector:@selector(myMethod)]) {
    [(id)object myMethod];
}