How to log a method's execution time exactly in milliseconds?

If you want to use in coding style, then use these statements,

NSDate *methodStart = [NSDate date];    /* ... Do whatever you need to do ... */    NSDate *methodFinish = [NSDate date];  NSTimeInterval executionTime = [methodFinish timeIntervalSinceDate:methodStart];  NSLog(@"executionTime = %f", executionTime);

Easy to use and has sub-millisecond precision.

But if you want use macros, then this is good approach

#define TICK   NSDate *startTime = [NSDate date]  #define TOCK   NSLog(@"Time: %f", -[startTime timeIntervalSinceNow])

Use it like this:

TICK;    /* ... Do Some Work Here ... */    TOCK;

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