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    <p>Don't use <code>NSTimer</code> that way. NSTimer is normally used to fire a selector at some time interval. It isn't high precision and isn't suited to what you want to do.</p> <p>What you want is a <strong>High resolution timer</strong> class (using <code>NSDate</code>):</p> <p><strong>Output:</strong></p> <pre><code>Total time was: 0.002027 milliseconds Total time was: 0.000002 seconds Total time was: 0.000000 minutes </code></pre> <p><strong>Main:</strong></p> <pre><code>Timer *timer = [[Timer alloc] init]; [timer startTimer]; // Do some work [timer stopTimer]; NSLog(@"Total time was: %lf milliseconds", [timer timeElapsedInMilliseconds]); NSLog(@"Total time was: %lf seconds", [timer timeElapsedInSeconds]); NSLog(@"Total time was: %lf minutes", [timer timeElapsedInMinutes]); </code></pre> <p><strong>Edit:</strong> Added methods for <code>-timeElapsedInMilliseconds</code> and <code>-timeElapsedInMinutes</code></p> <p><strong>Timer.h:</strong></p> <pre><code>#import &lt;Foundation/Foundation.h&gt; @interface Timer : NSObject { NSDate *start; NSDate *end; } - (void) startTimer; - (void) stopTimer; - (double) timeElapsedInSeconds; - (double) timeElapsedInMilliseconds; - (double) timeElapsedInMinutes; @end </code></pre> <p><strong>Timer.m</strong></p> <pre><code>#import "Timer.h" @implementation Timer - (id) init { self = [super init]; if (self != nil) { start = nil; end = nil; } return self; } - (void) startTimer { start = [NSDate date]; } - (void) stopTimer { end = [NSDate date]; } - (double) timeElapsedInSeconds { return [end timeIntervalSinceDate:start]; } - (double) timeElapsedInMilliseconds { return [self timeElapsedInSeconds] * 1000.0f; } - (double) timeElapsedInMinutes { return [self timeElapsedInSeconds] / 60.0f; } @end </code></pre>
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    1. POHow Do I write a Timer in Objective-C?
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    1. COThat was a fantastic explanation... Thank you but one prob. how to convert this double to a time format like "Hr:Sec:Min:Millsec"
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    2. COThis class does not contain a dealloc method. Won't this leak?
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    3. COIf I wanted to use this class to execute a block of code repeatedly (like a repeating NSTimer), how would I do this ?
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