File's Owner + First Responder
问题 What exactly does the File's Owner and First Responder Placeholder in Xcode represent? 回答1: Files Owner and First Responder are proxies for objects that will exist at runtime. Specifically, Files Owner represents the object which will be passed in for owner in the method [NSBundle loadNibNamed: owner]. You can specify, via the Attributes Info Panel, what kind of object owner will be. Once you've indicated what Files Owner is, you can make connections to it. First Responder is your portal to