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• iPhone memory management, a newbie question

  - by Reuven

  Hi, I've seen in (Apple) sample code two types of ways of allocation memory, and am not sure I understand the difference and resulting behavior. // FAILS NSMutableArray *anArray = [NSMutableArray array]; [anArray release]; // WORKS NSMutableArray *anArray1 = [[NSMutableArray alloc] init]; [anArray release]; By "FAILS" I mean I get crashes/runtime warnings etc., and not always as soon as I call the release... Any explanation appreciated. Thanks

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• iphone float vs integer rounding?

  - by Rob

  Okay, from what I understand, an integer that is a fraction will be rounded one way or the other so that if a formula comes up with say 5/6 - it will automatically round it to 1. I have a calculation: xyz = ((1300 - [abc intValue])/6) + 100; xyz is defined as an NSInteger, abc is an NSString that is chosen via a UIPicker. I want the calculation (1300 - [abc intValue]) to add 1 to 100 for each 6 units below 1300. For example, 1255 should result in xyz having a value of 100 and 1254 should result in a value of 101. Now, I understand that my formula above is wrong because of the rounding principles, but I am getting some CRAZY results from the program itself. When I punched in 1259 - I got 106. When I punched in 1255 - I got 107. Why would it behave that way?

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• Help: List contents of iPhone application bundle subpath??

  - by bluepill

  Hi, I am trying to get a listing of the directories contained within a subpath of my application bundle. I've done some searching and this is what I have come up with - (void) contents { NSArray *contents = [[NSBundle mainBundle] pathsForResourcesOfType:nil inDirectory:@"DataDir"]; if (contents = nil) { NSLog(@"Failed: path doesn't exist or error!"); } else { NSString *bundlePathName = [[NSBundle mainBundle] bundlePath]; NSString *dataPathName = [bundlePathName stringByAppendingPathComponent: @"DataDir"]; NSFileManager *fileManager = [NSFileManager defaultManager]; NSMutableArray *directories = [[NSMutableArray alloc] init]; for (NSString *entityName in contents) { NSString *fullEntityName = [dataPathName stringByAppendingPathComponent:entityName]; NSLog(@"entity = %@", fullEntityName); BOOL isDir = NO; [fileManager fileExistsAtPath:fullEntityName isDirectory:(&isDir)]; if (isDir) { [directories addObject:fullEntityName]; NSLog(@" is a directory"); } else { NSLog(@" is not a directory"); } } NSLog(@"Directories = %@", directories); [directories release]; } } As you can see I am trying to get a listing of directories in the app bundle's DataDir subpath. The problem is that I get no strings in my contents NSArray. note: - I am using the simulator - When I manually look in the .app file I can see DataDir and the contents therein - The contents of DataDir are png files and directories that contain png files - The application logic needs to discover the contents of DataDir at runtime - I have also tried using NSArray *contents = [fileManager contentsOfDirectoryAtPath:DataDirPathName error:nil]; and I still get no entries in my contents array Any suggestions/alternative approaches? Thanks.

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• How Can open root in iphone?

  - by Fatemeh

  Hi , I want to knowing how can i open root directory ? I know Messages saved in sms.db that is in "/var/root/Library/SMS/sms.db" , but I can not see sub folder of root, I know ,the root have password and should enter it to open ,... but how can open this without Unlock or entering password?

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• iPhone app store approval - coredata design change

  - by satyam

  I created an app, uploaded to app store and approved by app store as well. Its ready for download. The app is based on coredata. Now I changed the design of the app to add new functionality. Changes include addition of new attributes to current entities, deletion of few entities etc. Now, if I upload the app to app store, does it approve or not? Do I have to put and Note saying that "Please uninstall old version and install new version?" Will my app be approved first of all or not.

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• Memory leak when application loads in iPhone

  - by iPhoneDev

  I have a navigation based template, when I run my application using Instruments, the very first memory leak comes under: Leak Object: Malloc 128 bytes Responsible Library: CoreGraphics Responsible Frame: open_handle_to_dylib_path I don't know where this leak is coming from and how remove this. If it's a default leak, then I think I don't need to worry about it. But if it's not then I have to find a way to remove the leak.

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• Iphone simulator hangs while installing apps

  - by Digitalsleep

  I am using snow leopard, xcode 3.22, i first had this issue when i was using os 4 beta, i have removed the xcode software from my system and reinstalled. I can't get any app to load in the simulator, the app starts to install in the simulator then nothing, I can install the app to my device, but i can run anything in the simulator it just hangs, i am not sure what to do any idea?

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• Gesture recognizer for mouse down and up in iPhone SDK

  - by user545201

  I want to catch both mouse down and mouse up using gesture recognizer. However, when the mouse down is caught, mouse up is never caught. Here's what I did: First create a custom MouseGestureRecognizer: @implementation MouseGestureRecognizer -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { [super touchesBegan:touches withEvent:event]; self.state = UIGestureRecognizerStateRecognized; } -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { [super touchesEnded:touches withEvent:event]; self.state = UIGestureRecognizerStateRecognized; } @end Then bind the recognizer to a view in view controller: UIGestureRecognizer *recognizer = [MouseGestureRecognizer alloc] initWithTarget:self action:@selector(handleGesture:)]; [self.view addGestureRecognizer:recognizer]; When I click mouse in the view, the touchesBegan is called, but touchesEnded is never called. Is it because of the UIGestureRecognizerStateRecognized? Any advice will be appreciated! Thanks!

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• dynamically add uitextfield in the uiscrollview in iphone

  - by jaiminpanchal27

  i have an array of some values and i want to dynamically create textfields for all the string objects inside the array and add it to the scrollview.. how to do it..

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• IPhone - Memory Management problems.

  - by user321721

  i am going over my code and trying to get a handle on proper memory management. This code: imageView = [[[UIImageView alloc] initWithImage:myImage] autorelease]; causes my application to crash. I am using multiple view controllers within a nav bar controller. The app works fine, i cant select a person from the first view controller (tableview) and it puts me to a list of that persons photos, i can then select a photo from that view controller (tableview) and move to a final view with a scrollview for viewing the photo. Once i hit back on the navbar the previous view loads (list of photos in a tableview) however the app crashes right before the row is deselected using this code: (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; if(RowSelected != nil) { [MainTableView deselectRowAtIndexPath:RowSelected animated:YES]; } } Row selected is stored when a the user clicks a row. If i leave the code as : imageView = [[UIImageView alloc] initWithImage:myImage]; The app runs fine. Am i doing something wrong? do i not need to autorelease this? Thanks!

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• Xcode / iPhone Enterprise Distribution Certificate Made By Other Person

  - by ort11

  There is an Enterprise Distribution Provision that was created by another person that is no longer here (before me). Getting the development provision / certificate was fine, by adding myself to the team, etc. But what is the best way to clear the "No Valid / Matching Certificate" for the Distribution Provision when building for release / distribution? Will we have to make another Distribution Provision?

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• iPhone scrolling text

  - by user298261

  Hello! I'm currently making a role-playing game, and I want the text to scroll like all the other RPGs I've played. How would I accomplish this? Thanks!

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• iPhone App Startup Screen

  - by iFloh

  yet another basic question ... I have an app that takes about 4-5 secs to load. I want to use the time and show a startup screen that is visible at least for 4 seconds, and shows until the app is loaded and ready to show How can I build that into my app?

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• iphone getting hours/min/seconds app crashes.

  - by coure06

  i have this code in my overridden drawRect method NSDate *date = [NSDate date]; NSCalendar *calendar = [NSCalendar currentCalendar]; unsigned int unitFlags = NSHourCalendarUnit|NSMinuteCalendarUnit|NSSecondCalendarUnit; NSDateComponents *comp = [calendar components:unitFlags fromDate:date]; NSInteger h = [comp hour]; NSInteger m = [comp minute]; NSInteger s = [comp second]; NSLog(@"%i,%i,%i", h,m,s); NSLog(@"test"); [date release]; [calendar release]; [comp release]; I am calling drawRect using setNeedsDisplay from my custom method (timer based after each 1 secon). It runs only once and then app exit automatically. If i comment out all the code and just write NSLog(@"test"); then application works ok, it logs "test" after each 1 sec.

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• iPhone - sorting the results of a core data entity

  - by Digital Robot

  I have a core data entity that represents the attributes of a product, as number, price, etc. The product number is a NSString property and follows the form X.y where X is a number variable of digits and Y is one digit. For example. 132.2, 99.4, etc. I am querying the database to obtain the list of product numbers in order: The code is like this: + (NSArray*)todosOsItens:(NSString *)pName inManagedObjectContext:(NSManagedObjectContext *)context { Product *aProduct = [Product productWithName:pName inManagedObjectContext:context]; NSArray *all = nil; NSFetchRequest *request = [[NSFetchRequest alloc] init]; request.entity = [NSEntityDescription entityForName:@"Attributes" inManagedObjectContext:context]; request.predicate = [NSPredicate predicateWithFormat: @"(belongsTo == %@)", aProduct]; [request setResultType:NSDictionaryResultType]; [request setReturnsDistinctResults:YES]; [request setPropertiesToFetch:[NSArray arrayWithObject:item]]; NSSortDescriptor *sortByItem = [NSSortDescriptor sortDescriptorWithKey:@"ProductNumber" ascending:YES]; NSArray *sortDescriptors = [NSArray arrayWithObject:sortByItem]; [request setSortDescriptors:sortDescriptors]; NSError *error = nil; all = [[context executeFetchRequest:request error:&error] mutableCopy]; [request release]; return all; } but this query is not returning the sorted results. The results are coming on their natural order on the database. How do I do that? thanks.

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• iPhone screen rotates at random !

  - by Baldoph

  I use a tabBar Controller as root controller. It has 4 tabs and each of its ViewControllers has - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation { return YES; } as long as the tabBarController itself. But when I rotate the device (real or simulator), the screen turns at random! If it doesn't turn when I open the application it would have the same behavior until I quit the app. I tried to add the 4 viewControllers one by one in IB to see if one was problematic, but I obtained the same issue. It only always works when there is no tabs at all! Please tell me if you have any ideas. Thanks!

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• iphone view controller class - how to

  - by Brodie4598

  Hello - I need to create my own UIView class and it is not something I have had to do. I created the class, then laid out the small view in IB (it's just a few labels that i will later need to add data to ). but now im stuck on how to actually put an instance of it in my main view. Can someone point me in the direction of a good tutorial? The closest thing I have done to this is creating a custom tableViewCell. DataTagViewController *dataTag = [[DataTagViewController alloc]init]; [theMap addSubView: dataTag];

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• Retaining objects in game iphone

  - by Brodie4598

  Hello - I am trying to create a game and have run into what is probably a pretty easy problem to solve. As the player goes through the game, many objects (Vehicle) will be added and removed. The Vehicles get added to an array called currentVehiclesMutableArray. My problem is I cant figure out how to retain a Vehicle so that it remains in the array until I am finished with it.

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• Pattern for iPhone background loading during init?

  - by Rob S.

  Hi everyone, I'm currently kicking off a background thread to do some REST queries in my app delegate's didFinishLaunchingWithOptions. This thread creates some objects and populates the model as the rest of the app continues to load (because I don't block, and didFinishLaunchingWithOptions returns YES). I also put up a loading UIViewController 'on top' of the main view that I tear down after the background initialization is complete. My problem is that I need to notify the first view (call it the Home view) that the model is ready, and that it should populate itself. The trick is that the background download could have finished before Home.viewDidAppear is called, or any of the other Home.initX methods. I'm having difficulty synchronizing all of this and I've thought about it long enough that it feels like I'm barking up the wrong tree. Are there any patterns here for this sort of thing? I'm sure other apps start by performing lengthy operations with loading screens :) Thanks!

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• Unit Testing in iphone i got below error.

  - by Pradeep

  whenever i run the unit testing application to find whether appdelegate is there r not using the test suit -(void)testAppDelegate { id app_delegate=[[UIApplication sharedApplication]delegate]; STAssertNotNil(app_delegate,@"delegate not found"); } i got this error. Please help. "_OBJC_CLASS_$_UIApplication", referenced from: objc-class-ref-to-UIApplication in Tests.o ld: symbol(s) not found collect2: ld returned 1 exit status

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• iphone animation - catch notification

  - by satyam

  I'm using following lines of code to animate: CATransition *animation = [self getAnimation:dirString]; [[self view] exchangeSubviewAtIndex:0 withSubviewAtIndex:1]; [[[self view] layer] addAnimation:animation forKey:kAnimationKey]; After end of animation, I want to play sound. How can I get notification when animation is completed?

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• iPhone audio Filter Question

  - by Joe

  Okay, I am going to try to make this totally not a "plz send teh codez kthxbai" I am considering an app which takes sound (eventually an audio track) and applies an audio filter to it. So I can play sounds with AudioServicesPlaySystemSound via AudioToolbox framework just fine. What I need is a very simple example of how I might take a sound and apply (for instance) midrange boost etc. Actually the kind of alteration is irrelevant -- if I can get my head around how the alteration is done I can figure out the rest. I am just finding both docs and examples of altering audio in code to be very scarce. Thanks for any help!

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• insert data using sqlite issue on iphone ( not reflecting on table)

  - by prajakta

  i can insert my data but i cant show them on my table view ..i did [tableview reload data] but of no success here is my code -(void)gButtonTapped:(id)sender { NSLog(@"right nav bar button is hit%@ ",storePaths); //[self readAnimalsFromDatabase2]; appDelegate = (DatabaseTestAppDelegate *)[[UIApplication sharedApplication] delegate]; sqlite3 *database; sqlite3_stmt *compiled_statement1; if(sqlite3_open([storePaths UTF8String], &database) == SQLITE_OK) { //const char *sqlStatement = NSString *newQuery = [NSString stringWithFormat:@"insert into cat_tbl (cat_id,names,imgs) values ('12','test1','r.png')"]; // NSString *newQuery = [NSString stringWithFormat:@"select * from list_tbl"]; const char *sql = [newQuery cStringUsingEncoding:NSASCIIStringEncoding]; NSLog(@"update query is %@",newQuery); if(sqlite3_prepare_v2(database, sql, -1, &compiled_statement1, NULL) == SQLITE_OK) { int result = sqlite3_step(compiled_statement1); sqlite3_reset(compiled_statement1); NSLog(@"result %d", result); if(result != SQLITE_ERROR) { int lastInsertId = sqlite3_last_insert_rowid(database); NSLog(@"x %d", lastInsertId); } } } sqlite3_finalize(compiled_statement1); sqlite3_close(database); [tabelView reloadData];// this is also not working }

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• Best way to handle enable/disable of UIButtons on iPhone

  - by Anonymous

  I have an increase button and a decrease button, both of which affect a variable. The variable has a minimum and the decrease button will be disabled once that minimum is reached. Likewise for the maximum value of the variable. In my controller, I have two IBActions for both the increase and decrease actions, and two IBOutlets, in order to disable the buttons accordingly. At the bottom of my KVO statement to handle the value change, I have: increaseButton.enabled = value != MAX; decreaseButton.enabled = value != MIN; While this code is functional, I can't help but feel that feel this is a naive approach to the problem, especially since this requires 4 connections. Is there a better solution to this, one that uses fewer connections?

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• object not getting released in iphone

  - by Jaimin

  i m writing this code in my code to store the data in database.. Search *objSearchDetail = [[Search alloc] init]; objSearchDetail = [xmlResponseDetail objectAtIndex:i]; sql = "INSERT INTO tblsearchdetail(tblrecentsearch_id,name,address,email,url,street,postcode,city,telephone,mobile) VALUES(?,?,?,?,?,?,?,?,?,?)"; returnValue = sqlite3_prepare_v2(database, sql, -1, &insertStatement, NULL); if(returnValue == SQLITE_OK){ sqlite3_bind_int(insertStatement, 1, intLastRecentSearchId); sqlite3_bind_text(insertStatement, 2, [objSearchDetail.strName UTF8String], -1,SQLITE_TRANSIENT); sqlite3_bind_text(insertStatement, 3, [objSearchDetail.strAddress UTF8String], -1,SQLITE_TRANSIENT); sqlite3_bind_text(insertStatement, 4, [objSearchDetail.strEmail UTF8String], -1,SQLITE_TRANSIENT); sqlite3_bind_text(insertStatement, 5, [objSearchDetail.strUrl UTF8String], -1,SQLITE_TRANSIENT); sqlite3_bind_text(insertStatement, 6, [objSearchDetail.strStreet UTF8String], -1,SQLITE_TRANSIENT); sqlite3_bind_text(insertStatement, 7, [objSearchDetail.strPostCode UTF8String], -1,SQLITE_TRANSIENT); sqlite3_bind_text(insertStatement, 8, [objSearchDetail.strPlace UTF8String], -1,SQLITE_TRANSIENT); sqlite3_bind_text(insertStatement, 9, [objSearchDetail.strTelephone UTF8String], -1,SQLITE_TRANSIENT); sqlite3_bind_text(insertStatement, 10, [objSearchDetail.strMobile UTF8String], -1,SQLITE_TRANSIENT); if(sqlite3_step(insertStatement)==SQLITE_DONE) { //Data; } } NSLog(@"count %d",[objSearchDetail retainCount]); [objSearchDetail release]; now the nslog shows refrence count as 2 so even if i release the refrence count will still be one and the object will not be destroyed.. plz help me....

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