IDTech iOS/OSX SDK Guide  1.1.084
API reference for UniPay 1.5
Implement Optional Delegate Protocols

Implement any/all of the optional delegate protocols used to receive data from IDT_UniPayI_V_Delegate:

func deviceConnected()
func deviceDisconnected()
func plugStatusChange(deviceInserted: Bool)
func dataInOutMonitor(data: NSData!, incoming isIncoming: Bool)
func swipeMSRData(cardData: IDTMSRData!)
func deviceMessage(message: NSString!)
func lcdDisplay(mode: Int32, lines: [AnyObject]!)
func emvTransactionData(emvData: IDTEMVData!, errorCode error: Int32)