Understanding the UIPickerView

I haven't been successful in finding any good examples that can walk me through understanding the UIPickerView and UIPickerViewMode开发者_C百科l. Any advice?

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Why not use default Apple doc example? THere's example from apple doc called UICatalog.

http://developer.apple.com/library/ios/#samplecode/UICatalog/Listings/PickerViewController_h.html

Here it shows example of UIPickerView.

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There's an example in the MonoTouch samples: https://github.com/xamarin/monotouch-samples/tree/master/MonoCatalog-MonoDevelop