The book instructs us to make a connection between the Add Task button and the File’s Owner entry in the document outline. I’m using Xcode 8.3.3 and File’s Owner (indeed the whole Placeholders heading) seems to be missing from the document outline.
I found a workaround for making the connection to the button. Control-drag from the Add Task button to the First Responder entry in the document outline. Make sure it is the First Responder entry that appears in the View Controller Scene section, not the Window Controller Scene or Application Scene sections. I was able to select the addTask: action this way.
However, later in the chapter we are supposed to make a connection between File’s Owner and the table view. I was not able to make this connection since File’s Owner is missing and I could not find another workaround.
If anyone has a current solution for this, please post it.