- (void)someMethod
{
    if ( [delegate respondsToSelector:@selector(operationShouldProceed)] )
    {
        if ( [delegate operationShouldProceed] )
        {
            // do something appropriate
        }
    }
}

The documentation says:

The precaution is necessary only for optional methods in a formal protocol or methods of an informal protocol

What does it mean? If I use a formal protocol I can just use [delegate myMethod]?

objective-c ios
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