`ObjectAlloc` tracks all memory allocation and deallocation over the time your program is running.  

The **`Living bytes, or Net bytes`** is how much memory your application is using at the time you select in the timeline. That will include leaked memory, since leaked memory is never deallocated.  

**`#Living`** is how many allocations of a certain size/object type happened (and are still allocated). This is very useful when looking for leaks.  

For example, if you repetitively perform an action (like coming in an out of a modal view controller), and you see that `#Living` of an object grows by the same amount each time, then you&#39;re probably leaking those objects. You can then confirm by drilling down and seeing the exact line of code that is allocating the objects, and even see the time index each one was created.

**`Overall bytes`** includes memory that has been released. It&#39;s useful to track that number for performance optimization purposes, but not if you&#39;re just trying to see your current memory footprint or look for leaks.

Stats explanation from apple docs.
[Link to the document][1]

![enter image description here][2]


  
![enter image description here][3]


  [1]: http://developer.apple.com/library/mac/#documentation/AnalysisTools/Reference/Instruments_User_Reference/Introduction/Introduction.html
  [2]: http://i.stack.imgur.com/6yS7d.png
  [3]: http://i.stack.imgur.com/YbBOb.png

I&#39;m also using [GhostDoc][1] in Visual Studio 2008. How do I view all to-do items and if that&#39;s a function already in Visual Studio or in GhostDoc (the documentation tool that I use)?

  [1]: http://submain.com/products/ghostdoc.aspx



View all TODO items in Visual Studio using GhostDoc

Is it possible to catch exception and continue execution of script?

php: catch exception and continue execution, is it possible?

I&#39;m using Instument&#39;s ObjectAlloc tool in an attempt to understand what the memory my application (iPhone) is doing and when and where it is doing it. 

I would really like a basic explanation of these statistics:

 - Live Bytes
 - #Living
 - #Transitory
 - Overall Bytes

When I am trying to work out how much memory my application is using, am I to look at Live Bytes or Overall Bytes? Does this include leaked memory? What are Transitory objects?

Thanks



Instruments ObjectAlloc: Explanation of Live Bytes &amp; Overall Bytes

I'm using Instument's ObjectAlloc tool in an attempt to understand what the memory my application (iPhone) is doing and when and where it is doing it.
I would really like a basic explanation of these statistics:
<ul>
<li>Live Bytes</li>
<li>#Living</li>
<li>#Transitory</li>
<li>Overall Bytes</li>
</ul>
When I am trying to work out how much memory my application is using, am I to look at Live Bytes or Overall Bytes? Does this include leaked memory? What are Transitory objects?
Thanks

I am having some problem in installing my app on the iphone as I am constantly getting the following error message

&gt; The service is invalid
&gt; 
&gt; Please check your setup and try again
&gt; 
&gt; (0XE8000022)

It was running perfectly well till yesterday but since yesterday I am having this problem.

Error : The service is invalid

I have installed [Google Toolbox for Mac][1] into Xcode and followed the instructions to set up unit testing found [here][2].

It all works great, and I can test my synchronous methods on all my objects absolutely fine.  However, most of the complex APIs I actually want to test return results asynchronously via calling a method on a delegate - for example a call to a file download and update system will return immediately and then run a -fileDownloadDidComplete: method when the file finishes downloading.

How would I test this as a unit test?   

It seems like I&#39;d want to the testDownload function, or at least the test framework to &#39;wait&#39; for fileDownloadDidComplete: method to run.


EDIT: I&#39;ve now switched to using the XCode built-in XCTest system and have found that [TVRSMonitor][3] on Github provides a dead easy way to use semaphores to wait for async operations to complete. 

For example:

    - (void)testLogin {
      TRVSMonitor *monitor = [TRVSMonitor monitor];
      __block NSString *theToken;

      [[Server instance] loginWithUsername:@&quot;foo&quot; password:@&quot;bar&quot;
                                   success:^(NSString *token) {
                                       theToken = token;
                                       [monitor signal];
                                   }

                                   failure:^(NSError *error) {
                                       [monitor signal];
                                   }];

      [monitor wait];

      XCTAssert(theToken, @&quot;Getting token&quot;);
    }


  [1]: http://code.google.com/p/google-toolbox-for-mac/
  [2]: http://code.google.com/p/google-toolbox-for-mac/wiki/iPhoneUnitTesting
  [3]: https://github.com/travisjeffery/TRVSMonitor

How to unit test asynchronous APIs?

Is there any way to test the iPhone camera in the simulator without having to deploy on a device? This seems awfully tedious.

How do I test a camera in the iPhone simulator?

I&#39;m creating a folder to cache images inside Documents with my iPhone App.  I want to be able to keep the size of this folder down to 1MB, so I need to to check the size in bytes of my folder.

I have code to calculate the [size of file](https://developer.apple.com/documentation/foundation/fileattributekey/1416548-size), but I need the size of the folder.

What would be the best way to do this?


How can I calculate the size of a folder?

What is the best way to rename the app so that the title below the app icon can have spaces but the build files doesn&#39;t have spaces. (ie, title is &quot;My Project&quot; and build file is MyProject.app)

I changed PRODUCT_NAME but when I do that the app file also contains spaces.

Renaming all the fields seems to work fine except I can&#39;t find EXECUTABLE_NAME which is the default value for &quot;Executable file&quot;.

Thank you,
Tee

iPhone XCode - How to change title below app icon

I&#39;ve seen a number of strategies for declaring semi-private methods in **Objective-C**, but there does not seem to be a way to make a truly private method.  I accept that.  But, why is this so?  Every explanation I&#39;ve essentially says, &quot;you can&#39;t do it, but here&#39;s a close approximation.&quot;

There are a number of keywords applied to `ivars` (members) that control their scope, e.g. `@private`, `@public`, `@protected`.  Why can&#39;t this be done for methods as well?  It seems like something the runtime should be able to support.  Is there an underlying philosophy I&#39;m missing?  Is this deliberate?


Why doesn&#39;t Objective-C support private methods?

How can I get the number of times an NSString (for example, `@&quot;cake&quot;`) appears in a larger NSString (for example, `@&quot;Cheesecake, apple cake, and cherry pie&quot;`)?

I need to do this on a lot of strings, so whatever method I use would need to be relatively fast.

Thanks!

Number of occurrences of a substring in an NSString?

I have some questions about synthesized properties in Objective-C. The full list follows, but the basic question is this: **How does the compiler ensure that the ivars for synthesized properties are properly released, even though my code may or may not include release methods in dealloc?**

Note: I decided not to post these as individual questions because they are so closely related and because there are a handful of existing questions that *touch* on the individual issues without really getting to the heart of the matter.

Somewhat similar questions:

 - [Does property retain need a release?][1]
 - [What&#39;s the difference between property and synthesize?][2]
 - [Question on retain attribute with property and synthesize][3]

****

**Setup:** Consider a class with a single property:


    @interface Person : NSObject
    {
        NSString * name;
    }
    @property (nonatomic, retain) name;
    @end

****

**Question #1:** The very basic case:

    @implementation Person
    @synthesize name;
    @end

With this setup, I assume that `name` will be automatically released whenever a `Person` object is released. In my mind, the compiler simply inserts `[name release]` into the `dealloc` method as if I had typed it myself. Is that correct?

****

**Question #2:** If I choose to write my own `dealloc` method for this class, and I omit a call to `[name release]`, will that leak?

    @implementation Person
    @synthesize name;
    - (void)dealloc { [super dealloc]; }
    @end

****

**Question #3:** If I choose to write my own `dealloc` method for this class, and I *include* a call to `[name release]`, will that result in a double-release, since `@synthesize` has already taken care of it for me?

    @implementation Person
    @synthesize name;
    - (void)dealloc { [name release]; [super dealloc]; }
    @end

****

**Question #4:** If I choose to write my own property accessor for this class, but I *do not* write my own `dealloc` method, will `name` be leaked? 

    @implementation Person
    @dynamic name;
    - (void)setName:(NSString *)newName
    {
        [newName retain];
        [name release];
        name = newName;
    }
    @end

****

**Question #5:** I have a feeling (based on experience) that *none* of the above scenarios will result in leaks or double-releases, since the language has been designed to avoid them. That, of course, raises the question of &quot;how?&quot;. Is the compiler simply smart enough to keep track of every possible case? What if I were to do the following (note that this is a ludicrous example, just meant to illustrate my point):

    void Cleanup(id object) { [object release]; }
    
    @implementation Person
    @synthesize name;
    - (void)dealloc { Cleanup(name); }
    @end

Would that fool the compiler into adding another `[name release]` to the `dealloc` method?


  [1]: https://stackoverflow.com/questions/1782893/does-propertyretain-need-a-release
  [2]: https://stackoverflow.com/questions/806379/whats-the-difference-between-property-and-synthesize
  [3]: https://stackoverflow.com/questions/1980488/question-on-retain-attribute-with-property-and-synthesize

How is release handled for @synthesized retain properties?

While reading various C and C++ sources, I have encountered two macros `__APPLE__` and `__OSX__`. I found plenty of use of `__OSX__` in various codes, especially those originating from `*BSD` systems. 

However, sometimes I find that testing `__OSX__` only is not sufficient and I have to complete tests with `__APPLE__` macro.

The [Porting Command Line Unix Tools to Mac OS X][1] guides specifies `__APPLE__` and additionally `__APPLE_CC__` but does **not** mention `__OSX__`.

The [Porting from GCC][2] guide says:

&gt; * Use `#ifdef __GNUC__` to wrap any GCC-specific code.
&gt; * Use `#ifdef __APPLE_CC__` to wrap any Mac OS X-specific code.

Again, no mention about `__OSX__` macro.

What macro is predefined on Mac OS X platform and XCode development environment that should be used to distinguish OSX-specific code in C/C++ programs?

Where is the `__OSX__` macro defined? Is it `*BSD` specific macro?

  [1]: http://developer.apple.com/mac/library/technotes/tn2002/tn2071.html#Section10
  [2]: http://developer.apple.com/mac/library/releasenotes/DeveloperTools/GCC40PortingReleaseNotes/Articles/PortingToGCC.html

Which macro to wrap Mac OS X specific code in C/C++

How do I set up `NSZombieEnabled` and `CFZombieLevel` for my executable in Xcode 4?

How do I set up NSZombieEnabled in Xcode 4?

in fact the title contains my question.
I have a UISegmentedControl, and need to deselect currently selected tab.
I tried: 

    [menu setSelectedSegmentIndex:-1];
menu being the UBOutlet for uisegmentedcontrol but this gives me exception.
anyone have some idea?
thanks
peter


UISegmentedControl deselect (make none of the segments selected)

I&#39;m looking for a keyboard only shortcut for *Jump to Definition*. The built-in shortcut requires the mouse: &lt;kbd&gt;⌘&lt;/kbd&gt; + *Double click*.

I&#39;ve tried to add a regular keyboard shorcut for the *Edit&gt;Find&gt;Jump to Defintion* menu command, but, alas, it will only work when the method name is selected. I&#39;d like to be able to position the cursor within the method name, class name, or other symbol, and hit something like &lt;kbd&gt;⌘&lt;/kbd&gt;+&lt;kbd&gt;Shift&lt;/kbd&gt;+&lt;kbd&gt;L&lt;/kbd&gt;.

Does anyone know of a solution, perhaps using a script, for the problem?

*Update*: The keyboard shortcut works sometimes and sometimes not. When I position the text cursor on a method call with no parameters and press &lt;kbd&gt;⌘&lt;/kbd&gt;+&lt;kbd&gt;Shift&lt;/kbd&gt;+&lt;kbd&gt;L&lt;/kbd&gt; it takes me to the definition. But it doesn&#39;t work for a method that takes an `id` parameter. However it works if the parameter is an `int`.

I have submitted a bug report to Apple.

Keyboard shortcut for Jump to Definition

I am compiling an IPhone application via command line (so no XCode options involved) and I am unable to get my symbol names to show when profiling with Instruments. I have tried several flags such as -gdawrf-2 and -g without any success. I have also tried using dsymutils to generate a .dSYM file but i have no clue how I&#39;m supposed to use it so that failed aswell.

Any help will be greatly appreciated!

Missing symbol names when profiling IPhone application with Instruments

Is there a way to open the `UIAutomation` instrument through the terminal?

Will it be possible to write an `AppleScript` to open Apple&#39;s `UIAutomation` tool and load the application to be tested?

Can you please tell me is there any way through scripting or through the command line we can open `UIAutomation` and select the app to be tested, as well as select the test script?

Can the UI Automation instrument be run from the command line?

I&#39;m starting to use Instruments-Leaks with an iPhone 3G. When I try to run the app with Instruments on the iPhone I obtain

    Target failed to run: Remote exception encountered: &#39;Failed to get task for pid 280&#39;

Ideas?

The only time I succeed in running the app with instruments it run very slow, I couldn&#39;t test it. 
What are the steps to run the app on the device searching for leaks?


use instruments - leaks with a device

so--i switched on &quot;color misaligned images&quot; to improve drawing performance in our app. The documentation states: 

&gt; Puts a magenta overlay over images
&gt; whose source pixels aren&#39;t aligned to
&gt; destination pixels

I don&#39;t know what the yellow means however. (There is a &quot;Color Offscreen-Rendered&quot; option that uses yellow... does &quot;Color Misaligned Images&quot; also turn on this option?)

Anybody know?

TIA

What does yellow tinting represent when using &quot;color misaligned images&quot; on iPhone/iOS

Of all the Instruments Trace Templates, I love using:

* Zombies to detect where an object is getting over-released, great for debugging `EXEC_BAD_ACCESS` errors.
* Leaks to detect memory leaks.
* Core Animation w Color Blended Layers to detect frame rate &amp; translucent subviews, great for smoothing up `UITableView` scrolling.

I always hear people saying to profile my app&#39;s memory usage &amp; performance.

1. Why should I profile memory usage &amp; performance? My app runs fine.
2. How do I do it?

I&#39;ve used Allocations and see that my iPhone app starts at 1 MB total allocated memory and grows to 5 MB after normal usage. What is too high amount of memory usage on the iPhone? iPad? Mac?

Content Type	Original Author	Original Content on Stackoverflow
Question	Ross	View Question on Stackoverflow
Solution 1 - Iphone	Ken Aspeslagh	View Answer on Stackoverflow
Solution 2 - Iphone	Pranav Jaiswal	View Answer on Stackoverflow

Instruments ObjectAlloc: Explanation of Live Bytes & Overall Bytes

Iphone Problem Overview

Iphone Solutions

Solution 1 - Iphone

Solution 2 - Iphone

php: catch exception and continue execution, is it possible?

View all TODO items in Visual Studio using GhostDoc

Attributions