This is sample iOS 7 Objective-C application to illustrate usage of links attributes in attributed text. Any text can be highlighted as a link (in this saple - twitter user name styled text), so application can perform some task when user clicks a link. Also this sample illustrate how to make custom scheme for URI and handle it. iOS have build-in support for opening http links in Safari.
Based on this tutorial: http://www.raywenderlich.com/48001/easily-overlooked-new-features-ios-7#textViewLinks
Sample app is slightly modified and enhanced.