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  • Objective-C: Protocols

    - by Stu
    I'd like an instance variable object to adopt a protocol. @interface GameScene : Scene <AVAudioPlayerDelegate> { @private Layer *content <CocosNodeOpacity>; } For example I'd like my Layer object to adopt the <CocosNodeOpacity> so that I can get the methods -(GLubyte) opacity; //and -(void) setOpacity: (GLubyte) opacity; for free. The syntax shown above is invalid. Is it possible to achieve this without creating a new implementation file and creating a custom object? Thanks.

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  • Objective-C convention to prevent "local declaration hides instance variable" warning

    - by Nippysaurus
    Is there a common convention for dealing with these scenarios? The following code is what I am using .. -(id) initWithVariableName: (NSString*)variableName withComparisonValue:(NSString*)comparisonValue { self.mustExist = NO; self.reverseCondition = NO; self.regularExpression = NO; self.variableName = variableName; self.comparisonValue = comparisonValue; return self; } But I am getting "Local declaration of 'variableName' hides instance variable" and the same for "comparisonValue". The function signature seems logical to me, but surely there must be a more "acceptable" standard which will still make sense and be accurate but not generate annoying warnings?

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  • Objective C: Which is changed, property or ivar?

    - by Wilhelmsen
    Worrying about duplicates but can not seem to find and answer I can understand in any of the other posts, I just have to ask: When I have in my .h: @interface SecondViewController : UIViewController{ NSString *changeName; } @property (readwrite, retain) NSString *changeName; then in my .m @synthesize changeName; -(IBAction)changeButton:(id)sender{ changeName = @"changed"; } Is it the synthesized property or the instance variable that get changed when I press "changeButton" ?

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  • Objective-C: Getting the True Class of Classes in Class Clusters

    - by TechZen
    Recently while trying to answer a questions here, I ran some test code to see how Xcode/gdb reported the class of instances in class clusters. (see below) In the past, I've expected to see something like: PrivateClusterClass:PublicSuperClass:NSObject Such as this (which still returns as expected): NSPathStore2:NSString:NSObject ... for a string created with +[NSString pathWithComponents:]. However, with NSSet and subclass the following code: - (void)applicationDidFinishLaunching:(UIApplication *)application { NSSet *s=[NSSet setWithObject:@"setWithObject"]; NSMutableSet *m=[NSMutableSet setWithCapacity:1]; [m addObject:@"Added String"]; NSMutableSet *n = [[NSMutableSet alloc] initWithCapacity:1]; [self showSuperClasses:s]; [self showSuperClasses:m]; [self showSuperClasses:n]; [self showSuperClasses:@"Steve"]; } - (void) showSuperClasses:(id) anObject{ Class cl = [anObject class]; NSString *classDescription = [cl description]; while ([cl superclass]) { cl = [cl superclass]; classDescription = [classDescription stringByAppendingFormat:@":%@", [cl description]]; } NSLog(@"%@ classes=%@",[anObject class], classDescription); } ... outputs: // NSSet *s NSCFSet classes=NSCFSet:NSMutableSet:NSSet:NSObject //NSMutableSet *m NSCFSet classes=NSCFSet:NSMutableSet:NSSet:NSObject //NSMutableSet *n NSCFSet classes=NSCFSet:NSMutableSet:NSSet:NSObject // NSString @"Steve" NSCFString classes=NSCFString:NSMutableString:NSString:NSObject The debugger shows the same class for all Set instances. I know that in the past the Set class cluster did not return like this. What has changed? (I suspect it is a change in the bridge from Core Foundation.) What class cluster report just a generic class e.g. NSCFSet and which report an actual subclass e.g. NSPathStore2? Most importantly, when debugging how do you determine the actual class of a NSSet cluster instance?

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  • objective c - memory managment

    - by Amir
    lets say I have aclass @interface Foo :NSobject { NSstring *a; NSDate *b; } Foo *temp; my question is: when i use [temp retain] does the counter of the members also retain? lets say that i got ref of the class from some method and i want to retain the class do i need to retain each member?

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  • Objective-C Class Question?

    - by tarnfeld
    Hey, My head is about to explode with this logic, can anyone help? Class A #imports Class B. Class A calls Method A in Class B. This works great Class B wants to send a response back to Class A from another method that is called from Method A. If you #import Class A from Class B, it is in effect an infinite loop and the whole thing crashes. Is there a way to do this properly, like a parent type thing? BTW, I'm developing for iPhone.

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  • objective-c description method

    - by rocity
    Maybe I'm stupid...and this is my first question so forgive me...but when I run this code, I get the following output: (FROG idle:0 animating:0 rect:(null) position:{{1,2}{3,4}} tongue:{5,6}) This is wrong because it seems to be skipping the rect format string and placing everything displaced by one. So idle and animating are what i expect, then rect is skipped, but the result from NSStringFromCGRect(self.rect) is placed into position, then the result for position is pushed to tongue, then tongue is not displayed at all. I'm at a loss. - (NSString *)description{ return [NSString stringWithFormat:@"(FROG idle:%i animating:%i rect:%@ position:%@ tongue:%@)", self.idleTime, self.animating, NSStringFromCGRect(self.rect), NSStringFromCGPoint(self.position), tongue ]; }

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  • Basic Profanity Filter in Objective C for iPhone

    - by David van Dugteren
    How have you like minded individuals tackled the basic challenge of filtering profanity, obviously one can't possibly tackle every scenario but it would be nice to have one at the most basic level as a first line of defense. In Obj-c I've got NSString *tokens = [text componentsSeparatedByString:@" "]; And then I loop through each token to see if any of the keywords (I've got about 400 in a list) are found within each token. Realising False positives are also a problem, if the word is a perfect match, its flagged as profanity otherwise if more than 3 words with profanity are found without being perfect matches it is also flagged as profanity. Later on I will use a webservice that tackles the problem more precisely, but I really just need something basic. So if you wrote the word penis it would go yup naughty naughty, bad word written.

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  • Memory Management - Objective C NSString

    - by reising1
    I have an NSMutableDictionary called "output" and I am adding an NSString into it that is an integer. What is the proper way to do this? I can't figure it out. Everything I've tried ends up giving memory leaks. This is what I currently have: val is an int countryName is an NSString Here is how I declare "output": NSMutableDictionary *output = [[[NSMutableDictionary alloc] init] autorelease]; Here is the code that causes a memory leak: NSString *temp = [NSString stringWithFormat:@"%d",val]; [output setValue:temp forKey:countryName];

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  • Cast an instance of a class to a @protocol in Objective-C

    - by Ford
    I have an object (a UIViewController) which may or may not conform to a protocol I've defined. I know I can determine if the object conforms to the protocol, then safely call the method: if([self.myViewController conformsToProtocol:@protocol(MyProtocol)]) { [self.myViewController protocolMethod]; // <-- warning here } However, XCode shows a warning: warning 'UIViewController' may not respond to '-protocolMethod' What's the right way to prevent this warning? I can't seem to cast self.myViewController as a MyProtocol class. Update Andy's answer below is close, but includes an unneccesary '*'. The following works: [(id<MyProtocol>)self.myViewController protocolMethod];

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  • UIAlert View Objective C - Opening app store link

    - by benhowdle89
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"An Alert!" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"http://phobos.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=301349397&amp;amp;amp;amp;mt=8"]];]; [alert show]; [alert release]; I'm trying to display a UIAlertView with one "Ok" button and one "Buy Full Version" button. How can i make the above code work? Thanks

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  • Naming convention in Objective C /C , start with "_"?

    - by Tattat
    Something I see ppl define the variable like this: b2World *_world; b2Body *_body; CCSprite *_ball; instead of b2World *world; b2Body *body; CCSprite *ball; I familiar with the second one, but not the first one. So, I checked the Wikipedia about naming convention: Names beginning with double underscore or an underscore and a capital letter are reserved for implementation (compiler, standard library) and should not be used (e.g. __reserved or _Reserved). So, is that any special meaning which is start with "_"? The wiki page.

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  • Documenting Objective C classes, methods and variables

    - by Alex Reynolds
    What are good approaches to documenting ObjC classes, variables and methods, esp. for automated, downstream class creation, documentation creation, and general integration with Xcode? As an example, I like to use: #pragma mark - #pragma mark UITextField delegate methods for demarcating chunks of code of interest, for quick access from within Xcode.

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  • objective-c over-releasing in dealloc

    - by Dude Man
    Is mystring over-released? -(void)dealloc { [mystring release]; [mystring release]; [super dealloc]; } I assume this will not based on [nil release] does nothing: -(void)dealloc { [mystring release]; mystring = nil; [mystring release]; [super dealloc]; }

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  • Using iterateFunc to call objective c method

    - by Matt Welch
    Using spacemanager, I need to perform an action on select bodies after each step, so I figured that defining my own C function for iterateFunc would be the way to go. Everything works great, except I'm not sure how to then call an obj c method in the same class. In other words, an obj c class contains both the c function replacing iterateFunc, and the method that needs to be called. I don't see how to tell the c function what 'self' is, such that I can call the method. As far as i can tell, there's no way to pass in any extra info to the new iterateFunc. Any ideas, or a better way to go about things?

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  • Objective-C Social Networking General Question

    - by ludo
    Hi, I've been developing application for Iphone and now I want to try to create appplication like social bookmarking but I didn't really find any help on the net. I will have a create a login/pass, retrieve data and display them. So I want to know what do I have to use to implement all of that for any social bookmarking website. If you have suggestion, idea, tutorial, you are welcome. thanks,

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  • How to execute statements in order in objective c

    - by Vu Tu?n Anh
    When i tap on my button, my function was called [myBtn addTarget:self action:@selector(myFunction) forControlEvents:UIControlEventTouchUpInside]; In my function, a collection of complex statement will be executed and take a litte bit time to run, so i want to show Loading (UIActivityIndicatorView) as the following: -(void) addTradeAction { //Show Loading [SharedAppDelegate showLoading]; //disable user interaction self.view.userInteractionEnabled = NO; //execute call webservice in here - may be take 10s //Hide Loading [ShareAppDelegate hideLoading]; } When tap on myBtn (my Button) - after 3s or 4s, [ShareAppDelegate showLoading] was called. It is unusual when i use [ShareAppDelegate showLoading] on other Function, - it work very nice, i mean all the statement be executed in order. All i want, when i tap on My Button, Loading will be called immediatelly. Tks in advance

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  • Objective C Enumerate Sentences in a paragraph

    - by Faz Ya
    I would like to write an enumerator that would go through a paragraph of text and gives me one sentence at a time. I tried using stringEnumerate with the NSStringEnumerationBySentences but that simply looks at the periods and fails. For example, lets say I have the following text Block: "Senator John A. Boehner decided not to move forward. He also decided not to call the congress. The news reporter said though...." I would like my function to break down the above paragraph in the following sentences: Senator John A. Boehner decided not to move forward He also decided not to call the congress (No third sentence because it's a half a sentence) The String Enumerator with the sentence optionjust looks at the periods and breaks down that way which is wrong: Senator John A. Boehner decided not to move forward He also decided not to call the congress The news reporter said though.... Is there any library or function that I can call that does a better job at this? Thanks - (NSMutableString *) getOnlyFullSentencesFromTextBlock:(NSMutableString *) textBlock{ [textBlock enumerateSubstringsInRange:NSMakeRange(0, [textBlock length]) options:NSStringEnumerationBySentences | NSStringEnumerationLocalized usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) { NSLog(@"Sentence Frag:%@", substring); }]; return textBlock; }

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  • Silly Objective-C inheritance problem when using property

    - by Ben Packard
    I've been scratching my head with this for a couple of hours - I haven't used inheritance much. Here I have set up a simple Test B class that inherits from Test A, where an ivar is declared. But I get the compilation error that the variable is undeclared. This only happens when I add the property and synthesize declarations - works fine without them. TestA Header: #import <Cocoa/Cocoa.h> @interface TestA : NSObject { NSString *testString; } @end TestA Implementation is empty: #import "TestA.h" @implementation TestA @end TestB Header: #import <Cocoa/Cocoa.h> #import "TestA.h" @interface TestB : TestA { } @property NSString *testProp; @end TestB Implementation (Error - 'testString' is undeclared) #import "TestB.h" @implementation TestB @synthesize testProp; - (void)testing{ NSLog(@"test ivar is %@", testString); } @end

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  • Small gaps in section headers with custom headers - iPhone / Objective-C

    - by zhar
    Hi there! Since I wanted to use the standard section header with a different font size, I just made custom section headers by using an UIImageView with the standard section header as an image. It looks fine at first, but when I scroll the table, there are small gaps below and above the section headers: Since I am not allowed to post images or more than one hyperlink yet, I will have to provide you with one link to those images: Click me! Picture: How it looks like without touching anything Picture: Dragging the table down Picture: Dragging/Scrolling the table up So as you can hopefully see, there is a small empty gap under (2nd pic) and above (3rd pic) the section header. Another thing to mention is, that the standard behaviour of non-custom section headers is, that they don't become transparent when I drag the table down (making the table offset < 0.0). Is there a way to make custom section headers mimic the same behaviour without those annoying gaps? Greetings, Zhar

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  • Objective-C Using Accelerometer (iPhone)

    - by Johannes Jensen
    I have a class called MainGame, which is defined like this in my .h: @interface MainGame : Renderer <UIAccelerometerDelegate> Then later in my .m I have this: - (void) accelerometer: (UIAccelerometer *)accelerometer didAccelerate: (UIAcceleration *)acceleration { // here I would read values like accelerometer.x NSLog(@"accelerated!!1"); } Am I doing it right? Currently I'm only testing in iPhone simulator, I'm going to buy the apple $99 developer thing soon. It doesn't log "accelerated!!1", but I'm guessing that's because I'm not running it on an actual device yet?

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