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    <p>You can use DTrace to monitor a running application to see the methods and the classes that are called. You can easily monitor an iOS app running in the Simulator using DTrace on the command line, First you will need to find the PID of the application using <code>ps</code> and then you can run a DTrace probe like the following:</p> <pre><code>sudo dtrace -q -n 'objc1234:::entry { printf("%s %s\n", probemod, probefunc); }' </code></pre> <p>where 1234 is the process ID of the app.</p> <p>This will produce output that looks like the following:</p> <pre><code>UIStatusBarItemView -isVisible UIStatusBarLayoutManager -_positionAfterPlacingItemView:startPosition: UIView(Geometry) -frame CALayer -frame UIStatusBarLayoutManager -_startPosition UIView(Geometry) -bounds CALayer -bounds UIStatusBarItemView -standardPadding UIStatusBarItem -appearsOnLeft UIStatusBarItem -leftOrder </code></pre> <p>If you are only interested in tracing a single class, <code>UIView</code> for example, you could use:</p> <pre><code>sudo dtrace -q -n 'objc1234:UIView::entry { printf("%s %s\n", probemod, probefunc); }' </code></pre> <p>If you wanted to trace all calls to <code>dealloc</code> on all classes, you would use:</p> <pre><code>sudo dtrace -q -n 'objc1234::-dealloc:entry { printf("%s %s\n", probemod, probefunc); }' </code></pre> <p>Obviously, you could combine these to only see <code>UIView</code> <code>dealloc</code>s:</p> <pre><code>sudo dtrace -q -n 'objc1234:UIView:-dealloc:entry { printf("%s %s\n", probemod, probefunc); }' </code></pre> <p>If you want to be able to distinguish a specific object of a class you could also print the memory address of the object (<code>self</code>) using the following:</p> <pre><code>sudo dtrace -q -n 'objc1234:UIView:-dealloc:entry { printf("%s (0x%p) %s\n", probemod, arg0, probefunc); }' </code></pre> <p>DTrace is extremely powerful and can do considerably more than I've shown here.</p>
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    1. POCan the messages sent to an object in Objective-C be monitored or printed out?
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    1. COI agree that DTrace is powerful. Some suggestions: use a wildcard after the class to catch methods defined in categories. Include the `tid` in the printout. Also include the `timestamp`. The problem is that DTrace can receive data out of order and you may have to reconstruct the order. You may also have to tease apart the streams from different threads. See [this archived email](http://lists.apple.com/archives/xcode-users/2008/Oct/msg00114.html) with an attached script that does this plus tracks call depth within the thread. It uses an `order` variable rather than `timestamp`.
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      1. USKen Thomases
    2. CO@KenThomases Excellent points and I like the attached script
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    3. COYou can also create a custom instrument for this, an example of which I describe at the end of [this article over at MacResearch](http://www.macresearch.org/tuning-cocoa-applications-using-dtrace-custom-static-probes-and-instruments).
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      1. USBrad Larson
 

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