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    <p>If you're using a timer to manage the game, using a perform selector at the same time (to end the game or anything else) kind of defeats the point and makes the management very complex. Choose one route and stick with it.</p> <p>When the timer is running, you can change it's fire date using <code>setFireDate:</code>. So, you could get the current fire date, add your time to it and then set the new fire date:</p> <pre><code>- (void)extendByTime:(NSInteger)seconds { NSDate *newFireDate = [[self.timer fireDate] dateByAddingTimeInterval:seconds]; [self.timer setFireDate:newFireDate]; } </code></pre> <p>Then, your button callbacks are something like:</p> <pre><code>- (void)buttonOnePressed:(id)sender { [self extendByTime:1]; } - (void)buttonFivePressed:(id)sender { [self extendByTime:5]; } </code></pre> <p>Once you've removed the <code>performSelector</code> which calls <code>delay</code> your game end will be defined by <code>MainInt</code> reaching zero.</p> <p>As an aside, don't do this:</p> <pre><code>if (timer == 0) </code></pre> <p>The correct approach is:</p> <pre><code>if (timer == nil) </code></pre> <p>And if the timer is nil, there's no point in trying to invalidate it...</p> <p>Also a good idea to take a look at the Objective-C <a href="http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/CodingGuidelines/CodingGuidelines.html" rel="nofollow">naming guidelines</a>.</p> <hr> <p>Based on your recent comment, it seems that you actually want the timer to continue counting at a second interval, but to add time only to the number of seconds remaining. That's even easier and doesn't require any change to the timer fire date.</p> <pre><code>- (void)extendByTime:(NSInteger)seconds { MainInt += seconds; seconds.text = [NSString stringWithFormat:@"%i", MainInt]; } </code></pre> <p>And you need to add a check in 'countDownDuration':</p> <pre><code>if (MainInt &lt;= 0) { [timer invalidate]; [self delay]; } </code></pre> <p>To determine when you're done.</p>
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    1. POHow to add time to a countdown timer to iOS Project
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    1. POHow to add time to a countdown timer to iOS Project
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    1. COWell i added the code and ran it n my phone and seen that when i click the button to add the 5 seconds, it adds it and changes the number. The only thing is it wait five seconds to starts counting down again.
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    2. COYou removed the fire date change and instead are just updating `MainInt`?
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    3. COI entered all of the code but i don't understand why it pauses for 5 seconds and then counts down from the extra 5 seconds. That would be 10 more seconds
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