I am new to Xcode and currently using Xcode 6.4 on OSX Yosemite 10.10.4. I encountered 2 issues on creating Tab Bar Controller:
Issue #1: I am trying to create Tab Bar Controller navigation and the tab navigation area is greyed out even after simply dragging Tab Bar Controller from Show Object Library.
This is what shown after I drag Tab Bar Controller to the storyboard. Notice there are no tab icon, all grey out.
I then have to update the tab bar item manually by going to Attribute Inspector and change the System Item from Custom to something else. Is this the right way of doing it?
Issue #2: If I create a new controller class (.swift) file and tried to associate it with the tab views, I got an error when running the app in the simulator. For example my swift file: Tab1ViewController.swift (subclass of UIViewController) and set it as the Class for tab view #1.
Error message when the app is run: 2015-08-03 12:43:07.883 TabBar[14436:238828] Unknown class Tab1ViewController in Interface Builder file.
Appreciate any inputs on this.




