Yes, Real Steel has MFi controller support!
Real Steel on iOS does support controllers and is compatible with the MFI standard.
GIZMODO: "Game looks fun as hell." - iPHONEAPPREVIEW: "Real Steel is a solid winner." Based on the Dreamworks movie, starring Hugh Jackman, the gritty action of Real Steel takes place in a secret world where boxing has gone high-tech in the not-so-distant future.
Players lead their robot to greatness, fighting off steel opponents weighing over 2,000 pounds and reaching up to 8 feet tall.
Real Steel features rich gameplay and high replay value including new Tournament and Survival Modes.
Choose your fighter from a selection of 65 Robots! Including Movie Champions - Atom.
Real Steel supports MFi controllers.