Kent Nguyen has created a category that extends UIViewController, displaying another view which partially covers the current view. Take a look at the screenshot below to get an idea of how this looks. The original view (on the top) is partially hidden and the new view on the bottom is modal.
The screenshot below demonstrates a little more involved use of the category – the semi-modal view on the bottom of the display is a custom UIViewController which includes a button to dismisses the view.
If you are not familiar with how categories work, you can read more here: Introduction to Categories.
You can download KNSemiModal from github.
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