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POUnderstanding the effects on retain count of methods other than retain and release
 

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    <p>I have a routine to correctly allocate and deallocate my <code>UIView</code> subclass, but when I set a break point in the class's <code>- (void) dealloc</code>, I see that it is not called and I that have a huge memory leak.</p> <p>So I print the <code>retainCount</code> before the release and it is 2 (this could be normal, because other objects can use it). I searched and do not see any other <code>retain</code> messages. Then I send:</p> <pre><code>[myObject removeFromSuperview]; </code></pre> <p>And now it is deallocated. Which makes me realize that earlier I sent: </p> <pre><code>[self.view bringSubviewToFront:myObject]; </code></pre> <p>It is VERY DIFFICULT know that when I use <code>bringSubviewToFront:</code>, I always have to call <code>removeFromSuperview</code>. Do there exist other methods like this that can increase the retain count?</p> <p>If this object weren't a subclass, and was only a <code>UIView</code>, I would've never known that I had created a memory leak.</p> <p>So, how can I really know that my objects have been released and that the memory is free? </p> <p>It isn't important for me to know what is happening, but I want to know that I am creating and removing the object. Here's a demonstration that the same code with and without the <code>removeFromSuperview</code> can cause the effects I'm seeing -- this is my log. </p> <p>When I do <strong>not</strong> use <code>removeFromSuperview</code>,</p> <pre><code>Memory used 16687.1 ( +5378), free 262213.6 kb Memory used 19451.9 ( +2765), free 257159.2 kb Memory used 19451.9 ( +0), free 259530.8 kb Memory used 21844.0 ( +2392), free 257830.9 kb Memory used 24313.9 ( +2470), free 256356.4 kb Memory used 25260.0 ( +946), free 253141.0 kb Memory used 27848.7 ( +2589), free 252874.8 kb Memory used 30142.5 ( +2294), free 250814.5 kb Memory used 30814.2 ( +672), free 247787.5 kb </code></pre> <p>you can see the memory usage only increases, but when I <strong>do</strong> use it:</p> <pre><code>Memory used 16105.5 ( +4829), free 262619.1 kb Memory used 16527.4 ( +422), free 262815.8 kb Memory used 14168.1 ( -2359), free 262832.1 kb Memory used 16769.0 ( +2601), free 263266.3 kb Memory used 16560.1 ( -209), free 264785.9 kb Memory used 14200.8 ( -2359), free 264794.1 kb Memory used 16789.5 ( +2589), free 264290.3 kb Memory used 16597.0 ( -193), free 264499.2 kb Memory used 14237.7 ( -2359), free 264515.6 kb Memory used 16609.3 ( +2372), free 264290.3 kb Memory used 16560.1 ( -49), free 264425.5 kb Memory used 14200.8 ( -2359), free 264441.8 kb </code></pre> <p>now the memory increases and decreases like I want.</p> <p>I got the code to log the memory usage from <a href="https://stackoverflow.com/q/7990532/632472">https://stackoverflow.com/q/7990532/632472</a>.</p>
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