Handle Access Switch devices in iOS - Swift

AccessSwitchCommands.swift

var commands = [UIKeyCommand]()
var onceToken : dispatch_once_t = 0

override var keyCommands : [AnyObject]? {
    get {
        dispatch_once(&onceToken) {
            self.commands = [
                UIKeyCommand(input: " ", modifierFlags: nil, action: "spacePressed:"),
                UIKeyCommand(input: "\r", modifierFlags: nil, action: "enterPressed:"),
                UIKeyCommand(input: "0", modifierFlags: nil, action: "zeroPressed:"),
            ]
        }
        return self.commands
    }
}

func spacePressed(command: UIKeyCommand)
{
    println("Access Switch Space pressed")
}

func enterPressed(command: UIKeyCommand)
{
    println("Access Switch Enter pressed")
}

func zeroPressed(command: UIKeyCommand)
{
    println("Access Switch Zero pressed")
}