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• Creating an Objective-C++ Static Library in Xcode

  - by helixed

  So I've developed an engine for the iPhone with which I'd like to build a couple different games. Rather than copy and paste the files for the engine inside of each game's project directory, I'd a way to link to the engine from each game, so if I need to make a change to it I only have to do so once. After reeding around a little bit, it seems…

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• Objective-C++ compiles for iPhone, but not simulator

  - by John Smith

  I have a C++ library I want to add to my iphone project. In one header file I declare @class a { cppvirtualclass V; } This compiles fine for the iPhone device with Release settings. However it refuses to compile for the Simulator with or without debug info. It give the error error: type 'V' has virtual member functions. Is there a way…

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• Building Dynamic Classes in Objective C

  - by kjell_

  I'm a somewhat competent ruby programmer. Yesterday I decided to finally try my hand with Apple's Cocoa frameworks. Help me see things the ObjC way? I'm trying to get my head around objc_allocateClassPair and objc_registerClassPair. My goal is to dynamically generate a few classes and then be able to use them as I would any other class. Does…

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• Problem with accessing variables/functions from subclass Objective C

  - by Mitul Ruparelia

  Hi, I am having a problem with accessing public variable 'activity', which is a UIActivityIndicatorView type, see class declaration below in QuickStartViewController.h: @interface QuickStartViewController : UIViewController <ABPeoplePickerNavigationControllerDelegate> { @public IBOutlet UIActivityIndicatorView *activity; } @property…

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• Objective-C++ pre-compiled headers

  - by KayEss

  I'm using a C++ library (it happens to be in an iPad application, but I'm not sure that should make any difference) and would really like to have the headers pre-compiled to speed up the builds, but xCode seems to run the pre-compiled header file through the C compiler rather than the C++ one. Is there a way to get it to use the right…

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• Noob Objective-C/C++ - Linker Problem/Function Def Problem

  - by Josh

  There is a static class Pipe, defined in C++ header that I'm including. The function I'm interested in calling (from Objetive-c) is here: static ERC SendUserGet(const UserId &_idUser,const GUID &_idStyle,const ZoneId &_idZone,const char *_pszMsg); I have access to an objetive-c data structure that appears to store a…

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• Objective-C, .m / .mm performance difference?

  - by Sam

  I tend to use the .mm extension by default when creating new classes so that I can use ObjC++ later on if I require it. Is there any disadvantage to doing this? When would you prefer .m? Does .m compile to a faster executable (since C is generally faster than C++)?

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• Copying a directory off a network drive using Objective-C/C

  - by Jeff

  Hi All, I'm trying to figure out a way for this to work: NSString *searchCommand = [[NSString alloc] initWithFormat:@"cp -R /Volumes/Public/DirectoryToCopy* Desktop/"]; const char* system_call = [searchCommand UTF8String]; system(system_call); The system() method does not acknowledge the specific string I am passing in.…

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• What is the performance difference between blocks and callbacks?

  - by Don

  One of the things that block objects, introduced in Snow Leopard, are good for is situations that would previously have been handled with callbacks. The syntax is much cleaner for passing context around. However, I haven't seen any information on the performance implications of using blocks in this manner. What, if any,…

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• Objective C style nil in java?

  - by Usman Ismail

  Objective C has a concept of a nil object which would accept any method call with any parameters without complaining and silently return another nil. I have used something similar in Java using easymock and mockito for testing. Is there something similar for main line code? Is it even a good idea to have something like…

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• Mixing Objective-C and C++: Game Loop Parts

  - by Peteyslatts

  I'm trying to write all of my game in C++ except for drawing and game loop timing. Those parts are going to be in Objective-C for iOS. Right now, I have ViewController handling the update cycle, but I want to create a GameModel class that ViewController could update. I want GameModel to be in C++. I know how to…

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• Simplifying the process of compiling and running objective-c apps in GNUstep

  - by Matthew

  I just installed GNUstep (following this post: http://www.jaysonjc.com/programming/objective-c-programming-in-windows-gnustep-projectcenter.html) It says to run this code: gcc -o helloworld helloworld.m -I /GNUstep/System/Library/Headers -L /GNUstep/System/Library/Libraries -lobjc -lgnustep-base…

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• Objective C and ios development training courses feedback

  - by Mutuelinvestor

  I'm thinking about taking an Objective C / iphone/ipad development training course. Pragmatic Studio and Big Nerd Ranch appear to be the key players. I'd love to hear any feed back from anyone who has completed training with Pragmatic, Big Nerd or others. I'd interested in quality of…

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• Objective-C Lesson in Class Design

  - by Pota Onasys

  I have the following classes: Teacher Student Class (like a school class) They all extend from KObject that has the following code: - initWithKey - send - processKey Teacher, Student Class all use the functions processKey and initWithKey from KObject parent class. They…

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• Style: Dot notation vs. message notation in Objective-C 2.0

  - by groundhog

  In Objective-C 2.0 we got the "dot" notation for properties. I've seen various back and forths about the merits of dot notation vs. message notation. To keep the responses untainted I'm not going to respond either way in the question. What is your thought about dot notation vs.…

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• Add an objective @property attribute in objective-c

  - by morticae

  Does anyone know of a way to add additional attribute types to the @property keyword without modifying the compiler? Or can anyone think of another way to genericize getter/setter creation? Basically, I have a lot of cases in a recent project where it's handy for objects to…

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• importing a VCard in the address book , objective C [migrated]

  - by user1044771

  I am designing a QR code reader, and it needs to detect and import contact cards in vCard format. is there a way to add the card data to the system Address Book directly, or do I need to parse the vCard myself and add each field individually? I will be getting the VCArd in…

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• Objective-c Cocos2d moving a sprite

  - by marcg11

  I hope someone knows how to do the following with cocos2d: I want a sprite to move but not in a single line by using [cocosGuy runAction: [CCMoveTo actionWithDuration:1 position:location]]; What I want is the sprite to do some kind of movements that I preestablish. For…

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• Objective - Gestures while finger touches screen

  - by marcg11

  I'm creating a space cocos2d game with objetive-c. I have in the bottom left 2 arrows to move the sprite left or right. I also implemented a swipe gesture to change weapon, however it only happens when I'm not touching the screen. I would like the player to change weapons…

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• Ongoing confusion about ivars and properties in objective C

  - by Earl Grey

  After almost 8 months being in ios programming, I am again confused about the right approach. Maybe it is not the language but some OOP principle I am confused about. I don't know.. I was trying C# a few years back. There were fields (private variables, private data in an…

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• Objective-C Moving UIView along a curved path

  - by PruitIgoe

  I'm not sure if I am approaching this the correct way. In my app, when a user touches the screen I capture the point and create an arc from a fixed point to that touch point. I then want to move a UIView along that arc. Here's my code: ViewController.m //method to…

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• C-Objective Function

  - by nimbus

  I'm unsure about how to make MWE with C-Obective, so if you need anything else let me know. I am trying running through a tutorial on building an iPhone app and have gotten stuck defining a function. I keep getting an error message saying "use of undeclared…

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• Objective C - Aggro with Images

  - by Will

  I have three UIImageViews. enemy1, enemy1AggroBox and mainSprite. What I want to do is when mainSprite and enemy1AggroBox interect, I want enemy1 to start moving towards mainSprite. Basically creating aggro for a game. …

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• Is This a Valid Way to Use Blocks in Objective-C?

  - by Carter

  I've been building a HTTP client that uses web services to synchronize information between the client and server. I've been using Blocks and NSURLConnection to achieve this on the client side, but I'm getting frequent…

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• Bad Blocks Exist in Virtual Device PERC H700 Integrated

  - by neoX

  I have a DELL server with PERC H700 Integrated controller. I've made RAID5 with 12 harddrives and the virtual device is in Optimal state, but I receive such errors under linux: sd 0:2:0:0: [sda] Unhandled error code…

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