How to dynamically build up the arguments for NSLog?

Question

Example: I have a complex method that does a lot of stuff, and at the end I want to print a report with NSLog. NSLog wants a string, and then an arbitrary number of arguments. So lets say there are these possible values which can be logged:

A

B

C

D

E

F

It can happen that -for example- C and D are not logged, but the whole rest. How would I build up a dynamic thing which represent the value arguments for NSLog?

I choose NSLog for this question because it may be simpler aus NSPredicate and SUBQUERY. It seems impossible to build an NSPredicate format string dynamically while using an NSMutableString and appendFormat:... it results always in compile errors for the predicate. I guess that NSPredicate does something different with it's provided format values than NSMutableString -appendFormat does.

So if there was a way to feed NSPredicate with: 1) a huge, dynamically created format string 2) an huge, dynamically created "list" of arguments"

that would be cool.

Answer 1

Your underlying problem shouldn't be a problem. Just use +predicateWithFormat:argumentArray:. What issue are you having building this up?