How to disable NSLog all over the app?

Question

I want to disable NSLog() across all instances in an app. I found some code that does that:

#ifndef DEBUG
#define NSLog //
#endif

But adding this code to each file isn't good idea. How can I make it easier?

Manara

define it in .pch file – Rockabilly

Answer 1

Xcode has a precompiled header file ({project-name}-Prefix.pch in the Supporting Files group by default) that is a great place to put code that will be used across every file in the project. For going a step further and improving the log message itself, see Is it true that one should not use NSLog() on production code?.

Codee

Answer 2

Add the following lines to your constants file:

#define DEBUGGING NO    //or YES
#define NSLog if(DEBUGGING)NSLog

The two following sentences give the same results

#define NSLog

and

#define NSLog //

because all text that begin with // are deleted in a precompiling phase ("//" included)

Linin

your // suggestion is dangerous because you can spread NSLog over multiple lines. your if statement looks flaky too... you could use a scoped if and parameters for the NSLog macro to make it better... – Pagepageant

Answer 3

What I do is put this in the precompiled header file (YourAppName.pch):

#define MyLog if(0); else NSLog

Then I change all NSLog to MyLog everywhere else in the app. It works as if it were NSLog. But when you want to disable NSLog, go back to the .pch file and change the 0 to 1 and presto, all logging stops.

Cowen

This is dangerous because it changes the binding of any subsequent else. I.e. if (someCondition) MyLog(blah); else doSomething(); doesn't mean what it appears to. – Gobbet

@KenThomases Don't look at me, I got it from Jens Alfke! I haven't run into any issues like that yet, but I'm sure your warning is a good one. – Cowen

Answer 4

This will also take care of the warnings that arise when using

#define NSLog //

The code:

#ifndef DEBUG
  #define NSLog(...)
#endif

Unitary

Answer 5

Just add the following lines when you do'"t need NSLOG to your constants file

#define NSLog                       //

and comment it when you need it.

Bombardier