Yes, Battle Supremacy has MFi controller support!
Battle Supremacy on iOS does support controllers and is compatible with the MFI standard.
Feast your eyes on amazing landscapes and landmarks: entire forests teeming with wildlife, sprawling real-world cities with tunnels and bridges, overrun by tanks, trains, warships; there are even fish in the water! The gameplay is so immersive and engaging that destroying a target can feel like winning the battle, but really it's just the beginning THIS IS THE ULTIMATE WWII TANK COMBAT GAME AND SETS A NEW BAR FOR MOBILE GAMING! Both the Single player and Online Multiplayer experiences feature incredible graphics and a stunning level of detail.
AMAZING QUALITY, AND IT'S ONLY ON iOS! Play Battle Supremacy on all devices compatible with iOS7: iPhone 4, iPhone 4S, iPhone 5, iPhone 5S, iPad 2, 3rd gen iPad, 4th gen iPad, iPad Air, iPad mini and new iPad mini and iPod touch 5 for one low price.
Optimized for iPhone 5S and the new A7 processors with greater environmental detail, spectacular visual effects and unparalleled performance! GAME CENTER, AirPlay and iCloud iCloud support is integrated so players can save and share progress across devices.
AirPlay lets you play the game on larger displays via Apple TV. Climb the Game Center leaderboards, challenge friends and unlock dozens of achievements.
Battle Supremacy supports MFi controllers.