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PONSTimer stops the first time I tell it to, then refuses to stop
 

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    <p>I have declared an <code>NSTimer</code> in my <code>UIViewController</code> header as such:</p> <pre><code>NSTimer *mainTimer; </code></pre> <p>And I start it up in the <code>viewWillAppear</code> method in the implementation, so:</p> <pre><code>mainTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateAll) userInfo:nil repeats:YES]; </code></pre> <p>I have a button that flips the view over (standard utility app template) called <code>showInfo</code> and it has the command:</p> <pre><code>[mainTimer invalidate]; </code></pre> <p>When my app launches, the timer starts and does it's thing. The first time I tap that button and the view flips, the timer stops. When I'm done with the <code>flipSideViewController</code> and the main view reappears, the timer starts again. So far, good. The problem is that subsequent button presses (and thus calls to <code>[mainTimer invalidate]</code> don't make the timer stop. It just keeps going. I can flip back and forth all I want and it continues to update. For grins, I put two <code>invalidate</code> calls in a row, but that crashes.</p> <p>UPDATE:</p> <p>Found the problem. Upon returning from the <code>flipSideViewController</code>, I was calling <code>viewWillAppear</code> myself, which would create the timer. The run loop also calls <code>viewWillAppear</code> automatically, so a second timer was created. This only happened after I had visited the flip side once so the timer (single instance) would stop normally when I flipped the first time. Odd that I can create two timers with the same name though...</p>
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