How to print out the method name and line number and conditionally disable NSLog?

My answer to [this question][1] might help, looks like it's similar to the one Diederik cooked up. You may also want to replace the call to `NSLog()` with a static instance of your own custom logging class, that way you can add a priority flag for debug/warning/error messages, send messages to a file or database as well as the console, or pretty much whatever else you can think of.

#define DEBUG_MODE

#ifdef DEBUG_MODE
#define DebugLog( s, ... ) NSLog( @"<%p %@:(%d)> %@", self,
[[NSString stringWithUTF8String:__FILE__] lastPathComponent],
__LINE__,
[NSString stringWithFormat:(s),
##__VA_ARGS__] )
#else
#define DebugLog( s, ... )
#endif

[1]:

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***It is simple,for Example***

> -(void)applicationWillEnterForeground:(UIApplication *)application {
>
>
> NSLog(@"%s", __PRETTY_FUNCTION__);
>
> }

**Output:**
-[AppDelegate applicationWillEnterForeground:]

I've taken `DLog` and `ALog` from above, and added `ULog` which raises a `UIAlertView` message.

To summarize:


- `DLog` will output like `NSLog` only when the DEBUG variable is set
- `ALog` will always output like `NSLog`
- `ULog` will show the `UIAlertView` only when the DEBUG variable is set
<br/>
<pre>
#ifdef DEBUG
# define DLog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__);
#else
# define DLog(...)
#endif
#define ALog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__);
#ifdef DEBUG
# define ULog(fmt, ...) { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:[NSString stringWithFormat:@"%s\n [Line %d] ", __PRETTY_FUNCTION__, __LINE__] message:[NSString stringWithFormat:fmt, ##__VA_ARGS__] delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil]; [alert show]; }
#else
# define ULog(...)
#endif
</pre>

This is what it looks like:



![Debug UIAlertView][1]

+1 Diederik

[1]:

Disabling all NSLogs, for somebody allergic to MACROS, here is something that you can compile too:

void SJLog(NSString *format,...)
{
if(LOG)
{
va_list args;
va_start(args,format);
NSLogv(format, args);
va_end(args);
}
}

And, use it almost like NSLog:

SJLog(@"bye bye NSLogs !");

From this blog:

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