ios - Constant Declaration in swift -

i have constant string defined

#define knotificationmessage @"it's time take %@" 

in objective c use

[nsstring stringwithformat:knotificationmessage, medicinestring] 

as message uialertview . how achieve in swift

first create struct

struct astructconstants  {     static let samplestring : nsstring = nsstring(string: "check out learned %@ stackoverflow.") }  var astring : nsstring = nsstring(format: astructconstants.samplestring, "some custom text") println(astring) 

your output be:

check out learned custom text stackoverflow.