Per the Module interface, init() is called after any configuration data has been populated to the Inputfield, but before render.
Usage
$inputfield->init();Inputfield methods and properties
API reference based on ProcessWire core version 3.0.244
“To Drupal, or to ProcessWire? The million dollar choice. We decided to make an early switch to PW. And in retrospect, ProcessWire was probably the best decision we made. Thanks are due to ProcessWire and the amazing system and set of modules that are in place.” —Unni Krishnan, Founder of PigtailPundits