Text field iOS remove alert box

How can I disable the alert box that pops up on iOS when the user taps on a editable text field? I want the input to go directly into the field itself.

The short answer is that you can’t. The long answer is that you would have to write your own version of Slate’s IOSPlatformTextField. Ok, that’s not a long answer, but it is a lot more complicated. The class you are interested in is at Engine/Source/Runtime/Slate/Private/Framework/Text/IOS/IOSPlatformTextField.cpp.