The chat in Minecraft 1.2.5 is a bit glitchy on iOS devices. When you open it for the first time after restarting Minecraft, it's normal, but the second time you open it, instead of docking above the keyboard, it drops down to the bottom of the screen (Hidden by the keyboard), like in Windows 10 Edition of Minecraft 1.2.5. I hope you guys at Mojang fix this soon, because it really gets annoying trying to type in commands, or a message to someone else without being able to see what your typing in the chat.