"I couldn't be prouder of the work the team is doing making sure people who work there are treated fairly," Williams, a senior vice president, said Wednesday in an on-stage interview at the Code Conference in Rancho Palos Verdes, California. "People are continuously getting paid more. Every year sales are increasing. We pay more than average rates in the area."
Williams said that Apple's investigation of suicides over the years at facilities run by Foxconn, its outside manufacturer, indicated that they weren't related to working conditions.
Furthermore, he said there weren't that many on a relative basis. When suicide rates were at their highest, they were lower than at any point in the U.S.
"By that definition, it would be the happiest place on earth," he said.
Read MoreInside Apple's Foxconn
Apple has for years been under fire for the treatment of factory workers in China.
A string of suicides from 2010 to 2012 caught the attention of mainstream media outlets, and led to stories highlighting the extremely long hours, low pay, rough conditions and young age of many manual laborers helping assemble iPhones and other devices.