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POSupport command, control and arrow keys when an external keyboard is attached
 

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    <p>I have an iOS app where all I want to do is provide more support for basic command key combinations such as command+a, command+s, command+x, command+v and friends when a user has connected a bluetooth keyboard.</p> <p>I know this is possible. Applications such as Textastic and many other editing apps support these features.</p> <p>I have looked at UIResponder (which appears to only be used by the pop-up menu), UIKeyInput, UITextInput[Delegate] and other API docs with no reference to how to do this.</p> <p>It is easy to support which options are displayed in the UIMenuController using (BOOL)canPerformAction:(SEL)action withSender:(id)sender. However, this method does not appear to be called when a bluetooth keyboard is attached. So I either need to implement another method specifically for the keyboard or something else.</p> <p>I now suspect it could be that the text subsystem is responsible for performing the actions. However, there's no documentation that I can find! Also, none of the UITextInput delegate methods are called when an operation is performed. I'm almost thinking the solution is private and that I need to ask Apple specifically on how to get access to these features (which I have just done).</p> <p><strong>UPDATE:</strong></p> <p>positionFromPosition:inDirection:offset: is the method to use to detect when the arrow key is pressed. After iOS has called this method it then calls setSelectedText:. You'll need to work out the rest of the plumbing.</p> <p><strong>UPDATE 2:</strong></p> <p>I was able to answer all of the questions I had. Please refer to the marked solution for the answers.</p>
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