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  • Release an object without a pointer?

    - by Kai Friis
    I’ve just started developing for iPhone and am trying to get my head around memory management. I made a small program that shows a map and an annotation on the map. For the annotation I made a simple class that implements the MKAnnotation protocol. To create and add the annotation I wrote this: [self.myMapView addAnnotation:[[MyAnnotation alloc] init]]; It worked fine until I tried to release the object. Nothing to release. This is what I would have done in C#, I guess it doesn’t work without garbage collection? So is this the only way to do it? MyAnnotation *myAnnotation = [[MyAnnotation alloc] init]; [self.myMapView addAnnotation: myAnnotation]; [myAnnotation release];

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  • UIImageView Fade-In Dissapears

    - by Winder
    I have this code which should create a splash image with either no animation or a fade in, then call code to dismiss the image out after a delay. The SplashViewAnimationNone works fine and creates the full screen image, but the Fade code fades the image in but then immediately disappears. - (void)startSplash { [[[[UIApplication sharedApplication] windows] objectAtIndex:0] addSubview:self]; splashImage = [[UIImageView alloc] initWithImage:self.image]; if (self.animationIn == SplashViewAnimationNone) { [self addSubview:splashImage]; } else if (self.animationIn == SplashViewAnimationFade) { [self addSubview:splashImage]; CABasicAnimation *animSplash = [CABasicAnimation animationWithKeyPath:@"opacity"]; animSplash.duration = self.animationDelay; animSplash.removedOnCompletion = NO; animSplash.fillMode = kCAFillModeForwards; animSplash.fromValue = [NSNumber numberWithFloat:0.0]; animSplash.toValue = [NSNumber numberWithFloat:1.0]; animSplash.delegate = self; [self.layer addAnimation:animSplash forKey:@"animateOpacity"]; } // Dismiss after delay. [self performSelector:@selector(dismissSplash) withObject:self afterDelay:self.delay]; }

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  • NSNotification postNotificationName in AppDelegate but NSNotificationCenter in ViewController?

    - by James Testa
    I can't get the selector method, receiveChatText, in the NSNotificationCenter to execute and I am wondering if the problem is because the NSNotification postNotificationName is in AppDelegate.m but NSNotificationCenter is in ViewController.m? I.E. can the postNotificationName know that the NSNotificationCenter is in another viewController file or is that something I need to tell it? In a viewController.m I have -(id)init { self = [super init]; if(self){ [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(receiveChatText:) name:ChatMessageReceived object:nil]; return self; } - (void)receiveChatText:(NSNotification *)note { NSLog(@"received chat text"); } and in the top level AppDelegate.m file I have the following: -(void) didReceiveMessage { [[NSNotificationCenter defaultCenter] postNotificationName:ChatMessageReceived object:nil userInfo:nil]; } Any ideas what could stop receiveChatText from being executed when didReceiveMessage is called?

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  • Detect certain characters in a text field

    - by Craig
    What is the easiest way to detect a character in a text field? I want to be able to detect a certain character and replace that character with another specific character. So If I write in a text field... "zyxw" I want it to be replaced with "abcd". I'm a newbie and don't really know where to start with this or how to go about it. If anyone has any methods of doing this, I would really appreciate it.

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  • Getting text position while parsing pdf with Quartz 2D

    - by Koteg
    Hi guys, another question regarding pdf parsing... Just read PDF Reference version 1.7 "5.3.1 Text-Positioning Operators" and I am a little bit confused. I wrote some code to get transformation matrix and initial text position. CGPDFOperatorTableSetCallback (table, "MP", &op_MP);//Define marked-content point CGPDFOperatorTableSetCallback (table, "DP", &op_DP);//Define marked-content point with property list CGPDFOperatorTableSetCallback (table, "BMC", &op_BMC);//Begin marked-content sequence CGPDFOperatorTableSetCallback (table, "BDC", &op_BDC);//Begin marked-content sequence with property list CGPDFOperatorTableSetCallback (table, "EMC", &op_EMC);//End marked-content sequence //Text State operators CGPDFOperatorTableSetCallback(table, "Tc", &op_Tc); CGPDFOperatorTableSetCallback(table, "Tw", &op_Tw); CGPDFOperatorTableSetCallback(table, "Tz", &op_Tz); CGPDFOperatorTableSetCallback(table, "TL", &op_TL); CGPDFOperatorTableSetCallback(table, "Tf", &op_Tf); CGPDFOperatorTableSetCallback(table, "Tr", &op_Tr); CGPDFOperatorTableSetCallback(table, "Ts", &op_Ts); //text showing operators CGPDFOperatorTableSetCallback(table, "TJ", &op_TJ); CGPDFOperatorTableSetCallback(table, "Tj", &op_Tj); CGPDFOperatorTableSetCallback(table, "'", &op_apostrof); CGPDFOperatorTableSetCallback(table, "\"", &op_double_apostrof); //text positioning operators CGPDFOperatorTableSetCallback(table, "Td", &op_Td); CGPDFOperatorTableSetCallback(table, "TD", &op_TD); CGPDFOperatorTableSetCallback(table, "Tm", &op_Tm); CGPDFOperatorTableSetCallback(table, "T*", &op_T); //text object operators CGPDFOperatorTableSetCallback(table, "BT", &op_BT);//Begin text object CGPDFOperatorTableSetCallback(table, "ET", &op_ET);//End text object So this is the output after application lunch: 2010-09-02 15:09:23.041 testSearch[8251:207] op_BT begin Integer value: 0 2010-09-02 15:09:23.043 testSearch[8251:207] op_BT end 2010-09-02 15:09:23.043 testSearch[8251:207] op_Tf begin Integer value: 1 2010-09-02 15:09:23.044 testSearch[8251:207] op_Tf end 2010-09-02 15:09:23.044 testSearch[8251:207] op_Tm begin Float value: 557.364197 2010-09-02 15:09:23.045 testSearch[8251:207] op_Tm end 2010-09-02 15:09:23.045 testSearch[8251:207] op_TJ begin 2010-09-02 15:09:23.046 testSearch[8251:207] Array string value [0]: F 2010-09-02 15:09:23.046 testSearch[8251:207] Array integer value [1]: 94985208 2010-09-02 15:09:23.047 testSearch[8251:207] Array string value [2]: r 2010-09-02 15:09:23.047 testSearch[8251:207] Array integer value [3]: 94985208 2010-09-02 15:09:23.048 testSearch[8251:207] Array string value [4]: o 2010-09-02 15:09:23.048 testSearch[8251:207] Array integer value [5]: 94985208 2010-09-02 15:09:23.049 testSearch[8251:207] Array string value [6]: m s 2010-09-02 15:09:23.049 testSearch[8251:207] Array integer value [7]: 94985208 2010-09-02 15:09:23.049 testSearch[8251:207] Array string value [8]: a 2010-09-02 15:09:23.050 testSearch[8251:207] Array integer value [9]: 94985208 2010-09-02 15:09:23.050 testSearch[8251:207] Array string value [10]: m 2010-09-02 15:09:23.051 testSearch[8251:207] Array integer value [11]: 94985208 2010-09-02 15:09:23.051 testSearch[8251:207] Array string value [12]: p 2010-09-02 15:09:23.052 testSearch[8251:207] Array integer value [13]: 94985208 2010-09-02 15:09:23.053 testSearch[8251:207] Array string value [14]: l 2010-09-02 15:09:23.054 testSearch[8251:207] Array integer value [15]: 94985208 2010-09-02 15:09:23.055 testSearch[8251:207] Array string value [16]: e t 2010-09-02 15:09:23.055 testSearch[8251:207] Array integer value [17]: 94985208 2010-09-02 15:09:23.057 testSearch[8251:207] Array string value [18]: o r 2010-09-02 15:09:23.057 testSearch[8251:207] Array integer value [19]: 94985208 2010-09-02 15:09:23.058 testSearch[8251:207] Array string value [20]: e 2010-09-02 15:09:23.058 testSearch[8251:207] Array integer value [21]: 94985208 2010-09-02 15:09:23.059 testSearch[8251:207] Array string value [22]: s 2010-09-02 15:09:23.059 testSearch[8251:207] Array integer value [23]: 94985208 2010-09-02 15:09:23.060 testSearch[8251:207] Array string value [24]: u 2010-09-02 15:09:23.061 testSearch[8251:207] Array integer value [25]: 94985208 2010-09-02 15:09:23.061 testSearch[8251:207] Array string value [26]: l 2010-09-02 15:09:23.062 testSearch[8251:207] Array integer value [27]: 94985208 2010-09-02 15:09:23.062 testSearch[8251:207] Array string value [28]: t 2010-09-02 15:09:23.063 testSearch[8251:207] op_TJ end If someone is familiar with text matrix and text positioning operators it would be nice to explain how all those thing work. How to calculate text position (or glyph?) using Tm (transformation matrix and other data)?

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  • ObjectiveC - Releasing objects added as parameters

    - by NobleK
    Ok, here goes. Being a Java developer I'm still struggling with the memory management in ObjectiveC. I have all the basics covered, but once in a while I encounter a challenge. What I want to do is something which in Java would look like this: MyObject myObject = new MyObject(new MyParameterObject()); The constructor of MyObject class takes a parameter of type MyParameterObject which I initiate on-the-fly. In ObjectiveC I tried to do this using following code: MyObject *myObject = [[MyObject alloc] init:[[MyParameterObject alloc] init]]; However, running the Build and Analyze tool this gives me a "Potential leak of an object" warning for the MyParameter object which indeed occurs when I test it using Instruments. I do understand why this happens since I am taking ownership of the object with the alloc method and not relinquishing it, I just don't know the correct way of doing it. I tried using MyObject *myObject = [[MyObject alloc] init:[[[MyParameterObject alloc] init] autorelease]]; but then the Analyze tool told me that "Object sent -autorelease too many times". I could solve the issue by modifying the init method of MyParameterObject to say return [self autorelease]; in stead of just return self;. Analyze still warnes about a potential leak, but it doesn't actually occur. However I believe that this approach violates the convention for managing memory in ObjectiveC and I really want to do it the right way. Thanx in advance.

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  • strange memory error when deleting object from Core Data

    - by llloydxmas
    I have an application that downloads an xml file, parses the file, and creates core data objects while doing so. In the parse code I have a function called 'emptydatacontext' that removes all items from Core Data before creating replacements from the xml file. This method looks like this: -(void) emptyDataContext { NSMutableArray* mutableFetchResults = [CoreDataHelper getObjectsFromContext:@"Condition" :@"road" :NO :managedObjectContext]; NSFetchRequest * allCon = [[NSFetchRequest alloc] init]; [allCon setEntity:[NSEntityDescription entityForName:@"Condition" inManagedObjectContext:managedObjectContext]]; NSError * error = nil; NSArray * conditions = [managedObjectContext executeFetchRequest:allCon error:&error]; [allCon release]; for (NSManagedObject * condition in conditions) { [managedObjectContext deleteObject:condition]; } } The first time this runs it deletes all objects and functions as it should - creating new objects from the xml file. I created a 'update' button that starts the exact same process of retrieving the file the preceeding as it did the first time. All is well until its time to delete the core data objects again. This 'deleteObject' call creates a "EXC_BAD_ACCESS" error each time. This only happens on the second time through. See this image for the debugger window as it appears when walking through the deletion FOR loop on the second iteration. Conditions is the fetched array of 7 objects with the objects below. Condition should be an individual condition. link text As you can see 'condition' does not match any of the objects in the 'conditions' array. I'm sure this is why I'm getting the memory access errors. Just not sure why this fetch (or the FOR) is returning a wrong reference. All the code that successfully performes this function on the first iteration is used in the second but with very different results. Thanks in advance for the help!

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  • Problem with close socket

    - by zp26
    Hi, I have a problem with my socket program. I create the client program (my code is below) I have a problem when i close the socket with the disconnect method. Can i help me? Thanks and sorry for my English XP CFSocketRef s; -(void)CreaConnessione { CFSocketError errore; struct sockaddr_in sin; CFDataRef address; CFRunLoopSourceRef source; CFSocketContext context = { 0, self, NULL, NULL, NULL }; s = CFSocketCreate( NULL, PF_INET, SOCK_STREAM, IPPROTO_TCP, kCFSocketDataCallBack, AcceptDataCallback, &context); memset(&sin, 0, sizeof(sin)); int port = [fieldPorta.text intValue]; NSString *tempIp = fieldIndirizzo.text; const char *ip = [tempIp UTF8String]; sin.sin_family = AF_INET; sin.sin_port = htons(port); sin.sin_addr.s_addr = (long)inet_addr(ip); address = CFDataCreate(NULL, (UInt8 *)&sin, sizeof(sin)); errore = CFSocketConnectToAddress(s, address, 0); if(errore == 0){ buttonInvioMess.enabled = TRUE; fieldMessaggioInvio.enabled = TRUE; labelTemp.text = [NSString stringWithFormat:@"Connesso al Server"]; CFRelease(address); source = CFSocketCreateRunLoopSource(NULL, s, 0); CFRunLoopAddSource(CFRunLoopGetCurrent(), source, kCFRunLoopDefaultMode); CFRelease(source); CFRunLoopRun(); } else{ labelTemp.text = [NSString stringWithFormat:@"Errore di connessione. Verificare Ip e Porta"]; switchConnection.on = FALSE; } } //the socket doesn't disconnect -(void)Disconnetti{ CFSocketInvalidate(s); CFRelease(s); } -(IBAction)Connetti { if(switchConnection.on) [self CreaConnessione]; else [self Disconnetti]; }

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  • Problem adding UIBarButtonItems to a ToolBar

    - by Olivier de Jonge
    I have a UINavigationController with a UITableViewController in it. I want to show a ToolBar on the bottom with UIBarButtonItem's. The ToolBar is showing up, but the buttons won't appear. Anyone knows why? - (void)viewDidLoad { [super viewDidLoad]; [[self navigationItem] setTitle:@"Selections List"]; [[self navigationItem] setRightBarButtonItem:[[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(addProjectSearch:)] autorelease]]; [[self navigationItem] setLeftBarButtonItem:[self editButtonItem]]; [[super tableView] setDataSource: self]; [[super tableView] setDelegate: self]; //Toolbar UIBarButtonItem * logoutButton = [[[UIBarButtonItem alloc] initWithTitle:@"Log out" style:UIBarButtonItemStylePlain target:self action:@selector(logOut:)]autorelease]; NSMutableArray * arr = [NSMutableArray arrayWithObjects:logoutButton, nil]; [[self navigationController] setToolbarHidden: NO animated:YES]; [[self navigationController] setToolbarItems:arr animated:YES]; }

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  • how i can display a NSDATA description not in hex but in human redeable text ?

    - by halba
    I'm writing an iphone apps that receive data from an udp socket i can dispay what i receive using NSDATA description but is in hex format and for example it look like this: <4c61742c 34343039 3131302e 35302c4c 6f6e2c39 38343237 352e3934 2c482c32 37392e30 302c4b6e 6f74732c 302e3032 2c4e616d 652c504c 41594552 2c496e64 65782c30 2c4d756c 7469706c 61796572 4e756d62 65722c30 00 i know that thi is a prase of compite sens how i can convert it ?

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  • Cocoa window position anomaly

    - by Marius
    Hello everyone, I have a weird problem with positioning a window on screen. I want to center the window on the screen, but i don't know how to do that. Here's what i've got. The window is created from nib by the main controller: IdentFormController *ftf = [[IdentFormController alloc] initWithWindowNibName:@"IdentForm"]; [[ftf window] makeKeyAndOrderFront:self]; Now the IdentFormController has awakeFromNib() method in which it tries to position the window. For the sake of simplicity i've just tried to do setFrameOrigin(NSMakePoint(0, 0)). What happens is as follows: The first time i create this window, everything works as expected. But if i create it again after releasing the previous, it starts appearing at random positions. Why does it do that?

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  • UItableView Problem in deleting items from database

    - by Arun Sharma
    Hi All, I am using in UitableView database.My table view works successfully (add single item,add multiple item,delete all) only problem is there when i want to delete single item for this i using Uitableview edit option. so how i add database method for deleting single item from database and also from table view. Please help me.

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  • Copy NSArray and replace text items with bool values

    - by Frank Martin
    I utilize a (nested) plist to populate UITableViews where users can select entries at the deepest levels and set a checkmark (or not). I want to save these selections in a same structured list where at the deepest level the NSArray contains bool values instead the text strings that are displayed in the UITableView. So how can i build from a hierarchy like the following: Root - Item 0 (Dictionary) - Group (Dictionary) - Items (NSArray) - Item 0: @"Please check me" (String) a hierarchy like this? Root - Item 0 (Dictionary) - Group (Dictionary) - Items (NSArray) - Item 0: 0 (NSNumber) // NSNumber for bool values I'm trying to create a deep mutable copy and replace the items at the deepest levels but have somehow the feeling that this can be done easier. Thanks for any help with this in advance. Frank

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  • Data sources and NSTableView

    - by lampShade
    I know that table sources need a data source to hold the data that the tableview will display. Lets' say that I'm going to make my AppController be the data source of my tableview and that I make the connection in interface builder. My question is since my actual data is going to be stored in an array,let's call it myArray, when I set the data source in code should I do this [tableView setDataSource:myArray]; or this [tableView setDataSource:self]; I'm confused about this. setting the data source with the keyword "self" would set it to the AppController if I'm not mistaken.

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  • When are dynamically loaded NIBs assigned frames and bounds data?

    - by thebossman
    In one of my UIViewControllers, I am calling initWithNibName:bundle: for several other UIViewControllers. I am grabbing the view property in each of those dynamically created controllers and placing them, one after the other, in my parent view. For instance, the y offset of viewControllerB should be equal to the height of viewControllerA. The y offset of viewControllerC should be equal to the height of viewControllerB, and so on. I am initalizing these nibs in viewDidLoad, yet none of them have any meaningful bounds or frame properties. The sizes and positions of each are all zero. Where is the 'correct' place to do this type of operation so that I can grab meaningful values from these properties?

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  • How to use UISwipeGestureRecognizer on UIButton?

    - by Ashutosh
    I have a UIbutton which i want to work as a joystick. So i am trying to add some gesture recognizer on the same button. I have this in my code right now: UISwipeGestureRecognizer *recognizer; recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)]; [recognizer setDirection:(UISwipeGestureRecognizerDirectionUp)]; [self.gestureRecieverButton addGestureRecognizer:recognizer]; [recognizer release]; recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)]; [recognizer setDirection:(UISwipeGestureRecognizerDirectionDown)]; [self.gestureRecieverButton addGestureRecognizer:recognizer]; [recognizer release]; -(void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer { NSLog(@"Swipe received.%@",recognizer); } This is the error i am getting now: -[CUETutorialSixteenClusterRootController handleSwipeFrom:]: unrecognized selector sent to instance 0x79b71b0 2012-03-28 13:25:55.724 CUETrainer[1788:11f03] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[CUETutorialSixteenClusterRootController handleSwipeFrom:]: unrecognized selector sent to instance 0x79b71b0' But its not actually doing anything. Please help!!!!

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  • Change the state of a customized button (button with an image)?

    - by Harry Pham
    I know how to change the state of the regular button, as well as change the background color of a regular button. However, what I have is a image lay on top of a button (customized button). I want, when the user click on it, something visually would happen to let the user know that button is selected, and when the user click again it go back to the regular state. I try to change the background of the button, but it doesnt work since the image kind of cover the button. Any idea?

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  • How to have a UISwipeGestureRecognizer AND UIPanGestureRecognizer work on the same view

    - by Shizam
    How would you setup the gesture recognizers so that you could have a UISwipeGestureRecognizer and a UIPanGestureRecognizer work at the same time? Such that if you touch and move quickly (quick swipe) it detects the gesture as a swipe but if you touch then move (short delay between touch & move) it detects it as a pan? I've tried various permutations of requireGestureRecognizerToFail and that didn't help exactly, it made it so that if the SwipeGesture was left then my pan gesture would work up, down and right but any movement left was detected by the swipe gesture.

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  • Displaying very large images on the iPad

    - by Brodie4598
    I need to display some very large images on the iPad. The files are jpgs and are about 6700x2700 (maps). Is there any way around loading the entire image into memory? Currently I load it int a scroll view for zooming/panning. The images are stored locally on the device.

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