[Beginner] Adding a UIPickerView to a view

I've just started programming for the iPhone and I have a simple question:

I have a view with some content in it and I want to add a UIPickerView to it. I know how to add the picker view but then it stretches all over the screen even if I resize it in Interface Builder.

So do I need to put the UIPickerView in a separate view controller? Or should I resize it somehow so that it doesn't fill the whole screen?

 

That's not what I was looking for but thanks anyway.

Actually I had to connect the IBOutlet I wrote in Xcode with the UIPickerView object in Interface Builder.