I created first my TestViewController.h and *.m. Afterwards my TestView.xib.
Now I need to tell my xib: "Yes, please take the class TestViewController as my File's Owner".
I open up my xib, go to the Identity Inspector of its fileOwner and choose under "Custom Class" TestViewController.
But this seems not enough - as when I open up the TestView.xib, and then choose the "Assistent Editor View" it should bring up the corresponding ViewController on the right part of the split screen - in my case the "TestViewController.h". But it doesn't !
Is it necessary to bind the xib in any way to its viewcontroller by dragging lines to files like you do it with outlets and actions?
Click to select the xib. Now, select the file's owner. In the attribute panel on the right side, choose the third tab, "Identity Inspector". There is a header named Custom Class. Give your view controller's name there. After this, you can connect the elements with the file's owner.