JVFloatLabeledTextField is the first implementation a UX pattern that has come to be known the "Float Label Pattern".
Due to space constraints on mobile devices, it is common to rely solely on placeholders as a means to label fields. This presents a UX problem, in that, once the user begins to fill out a form, no labels are present.
This UI component library, which includes both a UITextField and UITextView subclass, aims to improve the user experience by having placeholders transition into floating labels that hover above the fields after they are populated with text.
Credits for the concept to Matt D. Smith (@mds), and his original design:
Currently, JVFloatLabeledTextField used alone is iOS 6+, but JVFloatLabeledTextView requires iOS 7 due to the use of UITextView's textContainer.
How the Float Label Pattern Started - Matt D. Smith
Float Label Pattern - Brad Frost
Material Design - Floating Labels - Google
JQuery / Zepto.js - Achmad Mahardi
Xamarin.iOS - Greg Shackles
Bootstrap plugin - Matt Powell
JavaFX - Andy Till
JQuery - Mike Mitchell
Android - Henrik Sandström
Added a port? Let me know - @jverdi