How to display this in iPad App?

How do I show this in iP开发者_如何转开发ad application.

It looks like some kind of modal popup.

What is it called and how do I integrate it in my iPad app?

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This is just a standard view controller that has been presented modally via the presentModalViewController:animated: method of the "parent" view controller. To achieve the exact effect as show in the picture, simply set the modalPresentationStyle property to UIModalPresentationFormSheet.

If you read the Modal View Controllers section of View Controller Programming Guide for iOS all will be revealed. (It also includes detailed sample code if this is what you require.)