Description of files in package:
1 POSSDKForIOSDemo:	Project of sample program
2 POSSDKForIOSlib:      Library and head files

How to use:
step1: Add POSSDKForIOSLIB.a to the customer's project
step2: Add head files:PortIO.h,WIFIPort.h,POSSDK.h
step3: Create instance of WIFIPort as printer_port,and then connect WIFI to printer by the method openPort: of this instance.
step4: Create instance of POSSDK as pos_sdk,and transmit printer_port to pos_sdk by the method systemSetPortIO: of  this instance.
step5: How to call methods in POSSDK.h,you can refer to sample program for detail.

In addition,you can search printers by using the method searchPort: in WIFIPort.h,and control log messages by log.cfg.