 - Click on you project, in the left hand organizer.
 - Select your target, in the next column over.
 - Select the *Build Settings* tab at the top.
 - Scroll down to &quot;Objective-C Automatic Reference Counting&quot; (it may be listed as &quot;CLANG_ENABLE_OBJC_ARC&quot; under the *User-Defined* settings group),
 - and set it to NO.

This is on Xcode 4.2 (Build 4D199).

In Xcode 4.2 beta, there were 2 places per target that you could toggle the use of ARC...  now there seems to be NONE.

Also, the &quot;Convert to ARC&quot; menu item seems to have disappeared.

Now, yes, I suppose that the ARC stuff was never meant for _Mac Developers_, as 4.2 beta _was_ iOS only, but not exactly sure what Mac developers who _did_ play with the ARC stuff in their Mac Apps are supposed to do now.... 

File Radar Reports. Wait for 4.3? redo the app? Edit the `.xcode` XML manually?  Not sure.

**Disable ARC or enable MRC**

You should operate by C flags
```
//enable ARC
-fobjc-arc
//disable ARC
-fno-objc-arc
```

You have three options:
1. Local - Compile Sources
2. Global - OTHER_CFLAGS
3. Global - CLANG_ENABLE_OBJC_ARC

[\[Under the hood\]][1] 


  [1]: https://stackoverflow.com/a/67576790/4770877

I registered one of my dlls on the development machine using regasm as below (ASP application)

In a cmd prompt, I navigated to 
C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727 and did:

    regasm /tlb &quot;xxx.dll&quot;

Now I made some changes in the dll. So I unregistered the dll using the command:

    regasm /u xxx.dll /tlb:xxx.tlb

Then I registered the updated dll again with previous command. But the changes are not coming up in the project, so I doubt it&#39;s still pointing to the old dll. I restarted the machine, but that did not help.
So:

 1. What are the ways to make sure my old dll is removed and the current one is new?
 2. Is there any physical path to check them manually?

**UPDATE:** The below solution fixed the issue.

To Register:

    SET WorkFolder= &#39;&lt;directory&gt;&#39;
    regasm.exe %WorkFolder%\xxx.dll /Codebase

To unregister.

    SET WorkFolder= &#39;&lt;directory&gt;&#39;
    regasm.exe /unregister %WorkFolder%\xxx.dll

How to unregister the assembly registered using regasm

I would like to remove old notifications that my app has made from the iOS 5 Notification Center. Can I do this? If so, how?

Can I programmatically clear my app&#39;s notifications from the iOS 5 Notification Center?

Today, I have update my xCode to 4.2 version,  And I want to disable the ARC,  I also search with the google.  but can&#39;t fix my problem. According the search results, In the target setting,  I can&#39;t find the &#39;Objective-C Automatic reference counting&#39; item,  So have no chance to set it to NO.  I find the item one by one,  and also use the search field.

And one know the newest Xcode4.2 ,how to disable the ARC for the project, not for the specific file.

Thanks very much.

How to disable Xcode4.2 Automatic Reference Counting

Today, I have update my xCode to 4.2 version, And I want to disable the ARC, I also search with the google. but can't fix my problem. According the search results, In the target setting, I can't find the 'Objective-C Automatic reference counting' item, So have no chance to set it to NO. I find the item one by one, and also use the search field.
And one know the newest Xcode4.2 ,how to disable the ARC for the project, not for the specific file.
Thanks very much.

I have a problem with Xcode 4.2 debugging in an iOS 5 simulator/device. The following code crashes, as expected:

    NSArray *arr=[NSArray array];
    [arr objectAtIndex:100];

In iOS 4, I get a useful stack trace of hex numbers. But in iOS 5, it just gives me:

    *** First throw call stack:
    (0x16b4052 0x1845d0a 0x16a0674 0x294c 0x6f89d6 0x6f98a6 0x708743 0x7091f8 0x7fcaa9 0x2257fa9 0x16881c5 0x15ed022 0x15eb90a 0x15eadb4 0x15eaccb 0x6f02a7 0x6faa93 0x2889 0x2805)

Thanks.

Xcode 4.2 debug doesn&#39;t symbolicate stack call

I&#39;m doing some performance testing of my app and noticed that it takes exceedingly long to run some integrations. After a while, I got a whole bunch of 

    Discarding message for event 0 because of too many unprocessed messages

in the xcode console. What does this mean precisely? 

iOS5 What does &quot;Discarding message for event 0 because of too many unprocessed messages&quot; mean?

I have many annotations in a mapview (with `rightCalloutAccessory` buttons). The button will perform a segue from this `mapview` to a `tableview`.  I want to pass the `tableview` a different object (that holds data) depending on which callout button was clicked.

For example: (totally made up)

 - annotation1 (Austin) -&gt; pass data obj 1 (relevant to Austin)
 - annotation2 (Dallas) -&gt; pass data obj 2 (relevant to Dallas)
 - annotation3 (Houston) -&gt; pass data obj 3 and so on... (you get the
   idea)

I am able to detect which callout button was clicked.

I&#39;m using `prepareForSegue`: to pass the data obj to the destination `ViewController`.  Since I cannot make this call take an extra argument for the data obj I require, what are some elegant ways to achieve the same effect (dynamic data obj)?

Any tip would be appreciated.

How to pass prepareForSegue: an object

There are some files in my iOS project that have some warnings, and I want to ignore those warnings. I don&#39;t want to disable warnings in the entire project (know how to do that), just some specific files. So, is there a way to completely ignore all warnings from a specific file?

I&#39;m using LLVM 3.0 and Clang on Xcode 4.2.

Ignore all warnings in a specific file using LLVM/Clang

I&#39;m just trying to do my usual data transfert. I define my NSMutableURLRequest then call

`[[NSURLConnection alloc] initWithRequest:request delegate:self];`

This used to be ok with Xcode 3 but Xcode 4 warns me about &quot;*Expression result unused*&quot; on that line.
The request does work but I would like to find a way to get rid of the warning.

I suppose I could store the connection in a variable but I don&#39;t really need it and I can&#39;t see the point of setting it to `nil` the next line (although this would remove the warning)

Please note: I&#39;m not 100% sure if it&#39;s Xcode 4 or the fact ARC is enabled.


Xcode 4 warning &quot;Expression result unused” for NSURLConnection

I&#39;m trying to write an iOS app that makes asynchronous requests to get data over the network. It seems like a lot of people recommend using NSURLConnection for this, and frequently mention the delegate method connection:didReceiveData:.

Unfortunately, I cannot for the life of me find out where this delegate method is documented. For one, it is not in [the protocol reference for NSURLConnectionDelegate][1]. It is listed in [the NSURLConnection Class Reference][2], but has apparently been deprecated as of iOS5. The documentation does not explain why it was deprecated, or what developers should use instead to achieve similar functionality.

What am I missing? A lot of what I&#39;ve read seems to imply that big changes were made to NSURLConnection for iOS5. Where are these changes documented? Is the documentation of delegate methods complete?

Thanks

  [1]: http://developer.apple.com/library/ios/#documentation/Foundation/Reference/NSURLConnectionDelegate_Protocol/Reference/Reference.html
  [2]: http://developer.apple.com/library/ios/#documentation/cocoa/Reference/Foundation/Classes/NSURLConnection_Class/Reference/Reference.html

iOS5 NSURLConnection methods deprecated

    @interface Article : NSObject 
    
    @property (nonatomic, strong) NSString *imageURLString;
    
    @end
    
    
    @implementation Class
    
    @synthesize imageURLString = _imageURLString;
    
    - (void)setImageURLString:(NSString *)imageURLString {
        _imageURLString = imageURLString;
        //do something else
    }

Did I correctly override the setter when ARC is enabled?


Override setter with arc

I&#39;d like to move up my view, when the keyboard is shown. The keyboard (height: 216) should push up my view with it&#39;s height. Is this possible with a simple code?

Xcode/iOS5: Move UIView up, when keyboard appears

I have a mobile website which has a div pinned to the bottom of the screen via position:fixed. All works fine in iOS 5 (I&#39;m testing on an iPod Touch) until I&#39;m on a page with a form. When I tap into an input field and the virtual keyboard appears, suddenly the fixed position of my div is lost. The div now scrolls with the page as long as the keyboard is visible. Once I click Done to close the keyboard, the div reverts to its position at the bottom of the screen and obeys the position:fixed rule.

Has anyone else experienced this sort of behavior? Is this expected? Thanks.

iOS 5 fixed positioning and virtual keyboard

**Can anyone help me remember what was the flag to tell the XCode to not use ARC for some file?** I had several files in my project marked as such... Until I added another file and decided to convert that one to ARC. Sounds easy, right? I expected that I would be able to simply check a file that I want and let the XCode do it&#39;s magic. Well, not so easy, during pre-check it stripped all -Noarc flags from the files and now I need to manually re- apply the flag to several files. 

the moral of this story is: **once your project is in ARC and you have some files marked as no ARC, do not re-run the convert to ARC tool from Refactor&gt;Convert to ARC.** It will not restore your settings even if pre-check fails. 



ios5 ARC what is the compiler flag to exclude a file from ARC?

I have a working app and I&#39;m working on converting it to ARC in Xcode 4.2. One of the pre-check warnings involves capturing `self` strongly in a block leading to a retain cycle. I&#39;ve made a simple code sample to illustrate the issue. I believe I understand what this means but I&#39;m not sure the &quot;correct&quot; or recommended way to implement this type of scenario.

 - self is an instance of class MyAPI
 - the code below is simplified to show only the interactions with the objects and blocks relevant to my question
 - assume that MyAPI gets data from a remote source and MyDataProcessor works on that data and produces an output
 - the processor is configured with blocks to communicate progress &amp; state

code sample:

    // code sample
    self.delegate = aDelegate;
    
    self.dataProcessor = [[MyDataProcessor alloc] init];
    
    self.dataProcessor.progress = ^(CGFloat percentComplete) {
        [self.delegate myAPI:self isProcessingWithProgress:percentComplete];
    };
    
    self.dataProcessor.completion = ^{
        [self.delegate myAPIDidFinish:self];
        self.dataProcessor = nil;
    };
    
    // start the processor - processing happens asynchronously and the processor is released in the completion block
    [self.dataProcessor startProcessing];

Question: what am I doing &quot;wrong&quot; and/or how should this be modified to conform to ARC conventions?

How do I avoid capturing self in blocks when implementing an API?

With the new automatic reference counting (ARC) introduced in Xcode 4.2, we no longer need to manually manage retain / release in Objective-C.

This seems similar to garbage collection, as done in Objective-C on the Mac, and in other languages.  How does ARC differ from garbage collection?

What is the difference between Objective-C automatic reference counting and garbage collection?

I am trying to learn Automatic Reference Counting in iOS 5. Now the first part of this question should be easy:

 1. Is it correct that I do **NOT** need to write explicit
    release-property statements in my dealloc when using ARC? In other
    words, is it true that the following does **NOT** need a explicit
    dealloc?

        @interface MyClass : NSObject
        @property (strong, nonatomic) NSObject* myProperty;
        @end
    
        @implementation MyClass
        @synthesize myProperty;
        @end

 2.   My next and more important question comes from a line in the [Transitioning to ARC Release Notes][1] document:

    &gt; You do not have to (indeed cannot) release instance variables, but you may need to invoke [self setDelegate:nil] on system classes and other code that isn’t compiled using ARC.

 This begs the question: how do I know which system classes are not compiled with ARC? When should I be creating my own dealloc and explicitly setting strongly retaining properties to nil? Should I assume all NS and UI framework classes used in properties require explicit deallocs?

There is a wealth of information on SO and elsewhere on the practices of releasing a property&#39;s backing ivar when using manual reference tracking, but relatively little about this when using ARC.


  [1]: http://developer.apple.com/library/mac/#releasenotes/ObjectiveC/RN-TransitioningToARC/_index.html

Do I set properties to nil in dealloc when using ARC?

What is the difference between weak and strong property setter attributes in Objective-C?
    
    @property(retain, [weak/strong]) __attribute__((NSObject)) CFDictionaryRef myDictionary;

What is the impact and benefit?

I heard that weak is not available on iOS 4 and we need to use assign.

Is weak similar to assign?

Content Type	Original Author	Original Content on Stackoverflow
Question	user501836	View Question on Stackoverflow
Solution 1 - Xcode	NJones	View Answer on Stackoverflow
Solution 2 - Xcode	Alex Gray	View Answer on Stackoverflow
Solution 3 - Xcode	yoAlex5	View Answer on Stackoverflow

How to disable Xcode4.2 Automatic Reference Counting

Xcode Problem Overview

Xcode Solutions

Solution 1 - Xcode

Solution 2 - Xcode

Solution 3 - Xcode

Can I programmatically clear my app's notifications from the iOS 5 Notification Center?

How to unregister the assembly registered using regasm

Attributions