I would use a Rotor Riot MFI plug in controller with my iPhone to play Minecraft. Upon plugging it in it works normally with the game. Sometimes when playing ill use the touch controls, or Ill touch the screen by accident making the touch controls appear. When I go back to using the controller the touch controls disappear as they should, and the controller button prompts show again, However, If you open the chat when using the controller and select the chat box, you obviously have to type something using the on screen Touch keyboard. After you type something and exit, the touch controls REMAIN on the screen EVEN when you go back to using the controller. It starts doing a bunch of weird things. It starts making you Mine blocks constantly, the "Strafe" buttons appear on the touch D pad when you use the joystick on the physical controller accessory, and worst of all, the buttons in- game like "save and quit" CANNOT be pressed. Forcing you to force close the game.    

This bug makes the game like 80% unplayable with a controller now, and I am really upset the I can No longer use my $50 Rotor Riot iPhone controller with Minecraft Bedrock iOS anymore.  

How to recreate  

1 Plug a controller in and launch the game

2 When in game, at first it works normally(you can move around, place and mine/attack, basic stuff)

3 Now, Open the Chat, use the search in the crafting menu, or creative inventory(Basically anything that will open the on screen keyboard). Send message in chat or exit that menu, and watch the game break... The touch controls remain on screen, and it starts breaking blocks by itself.

Please fix this soon... I've been playing much less because of this.