There are applications that can do this. For example, Quick Office can interpret Cmd+ Bfrom a physical keyboard to bold text in a document.
What APIs in the iOS SDK will allow me to get keyboard input, for example? Doesn't seem to UIResponderhave any keyboard related methods?
UIResponder
First you will need to determine how to track the selection in bold. cmd + b will not work because there is no CMD on the iOS keyboard.
textFieldTextDidChange , , BOLD, , , .
textFieldTextDidChange