Resign first responder from anywhere.

gistfile1.m

// Make sure viewDidAppear has happened before sending this action to ensure that all links 
// in the responder chain are connected.
// http://stackoverflow.com/a/11768282/1306872
[[UIApplication sharedApplication] sendAction:@selector(resignFirstResponder)
                                           to:nil
                                         from:nil
                                     forEvent:nil];