One that selects: the frequency selector of a radio. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "selector" in a sentence
"Below there is the scheduled timer: animationTimer = NSTimer scheduledTimerWithTimeInterval: animationInterval target: self selector: @selector (refreshAll) userInfo: nil repeats: YES"