Picker Not Showing?

When I drag PickerView on my wind开发者_开发问答ow as my program runs, it's not showing any PickerView? Please guide me. Sorry for my poor English.

I assume you are new to iPhone programming so, a million of things could be happening. Just some guesses/advices:

1. Make sure the view you are seeing when you run the program and when editing it in Interface Builder is the same.(If you are not sure, change the background color of the view so you will know, etc.)

2. Make sure you did save the file (in interface builder) before compiling.

3. In Xcode, Clear all and Build again ;)