“initWithRequest:delegate:”被弃用:第一次在iOS 9.0中被弃用——使用NSURLSession(参见NSURLSession.h)

i am new in objective C and using iOS 9 Xcode 7.2 and getting this warning "'initWithRequest:delegate:' is deprecated: first deprecated in iOS 9.0 - use NSURLSession(see NSURLSession.h)" how to solve it. my code is given below.i am new in objective C and using iOS 9 Xcode 7