I knew I'd read something on the subject. Brad Cox, in his book "Object Oriented programming", discusses the influence Smalltalk-80 had on how he designed Objective-C, when he was creating it.
From the opening of chapter four, "Objective-C implements the dynamically bound style of object-oriented programming used in Smalltalk-80 as a set of extensions to a conventional base language, C."
Smalltalk-80 gets a lot more discussion, and there is a lot more about the influence of Smalltalk-80. My copy was printed in 1986, when the programming world looked very different, but from his own words it's pretty clear that something of Smalltalk is very much in Objective-C.
From the opening of chapter four, "Objective-C implements the dynamically bound style of object-oriented programming used in Smalltalk-80 as a set of extensions to a conventional base language, C."
Smalltalk-80 gets a lot more discussion, and there is a lot more about the influence of Smalltalk-80. My copy was printed in 1986, when the programming world looked very different, but from his own words it's pretty clear that something of Smalltalk is very much in Objective-C.