如何在swift 3.0中编写此代码，特别是在swift3中如何使用Macro？

Question

How to write this code in swift 3.0?

NSSTring *countString=[NSString stringWithFormat:@"%d %@",count,EDIT_CHAR];

where, EDIT_CHAR is a Macro & count is integer.

Answer 1

Swift haven't a preprocessor, but you can create a structure with all you constants or flags.

struct MyAppConstants {
 static let editChar = "f"
// Etc...
}

You can call it as MyAppConstants.editChar
You question is tagged swift but the code you've posted is ObjC.