I am a new learner and following the Book "Develop in Swift Fundamentals for Xcode 11, in a step by step fashion. The first app "Hello World" is fine, but when I add a Button and try to "Control-Drag" to View Controller in Assistant Editor, it generate an error. "Could not insert new action connection: No @implementation found for the Class UIView Controller". I am using Xcode 11.5 on a MacBook Pro (mid-2012) running Mac OS Catalina (10.15.7) Can someone help me. Perhaps the Book Material is not compatible with my setup. What should I do?
Control-Drag of Button to ViewController generates error
sounds like you missed a step. You probably haven't specified the class name of your view controller, which probably doesn't want to be "UIViewController", but some subclass of it that you write. In Xcode, select the View Controller in the Storyboard or .xib file, then in the Identify inspector in the right, enter or select the correct name of your custom view controller class.