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• Release a retain UIImage property loaded via imageNamed?

  - by user158103

  In my class object i've defined a (nonatomic, retain) property for UIImage. I assigned this property with an image loaded via [UIImage imageNamed:@"file.png"]; If at some point I want to reassign this property to another image, should I have to release the prior reference? I am confused because by the retain property I know i should release it. But because imageNamed is a convenience method (does not use alloc), im not sure what rule to apply here. Thanks for the insight!

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• How to pass the equivalent of nil for an (NSError **)

  - by Eddie Marks

  I have a method that takes an (NSError **) but I don't want to pass it one. When I pass it "nil" or "NULL" I end up with "EXC_BAD_ACCESS". The offending line is "*error = nil;" How do I pass it the equivalent of "nil" without crashing?

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• Reset UITextField's original placeholder text

  - by Michael

  I'm adding some user feedback mechanism into my app. The user types some comments into a text field and when that editing is done it updates a UITextView. Then when the user hits the submit button and moves on in the app the user may have need to send more feedback from the same form for a different item. I can reset the other fields and labels in the app to their default values when I hide the view, but not the textField (?). How can I reestablish the placeholder text next time the user accesses this view? Your suggestions are humbly appreciated.

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• Preload *.wav with SystemSoundID?

  - by fuzzygoat

  I am playing a wav file to give a little audio feedback when a button in my UI is pressed. My question is when you first press the button there is a delay (about 1.5secs) whilst the sound file "sound.wav" is loaded and cached. Is there a way to pre-cache this file (maybe in my viewDidLoad)? I guess I could do it by just playing it a viewDidLoad, but would really need to disable the audio so it does not "beeb" each time the app starts. many thanks for and help. gary EDIT: Looks like my question is a duplicate of this post unless anyone has any new info? Maybe a way to turn the play volume down temporarily, unless the audio is cleared each time through the run loop.

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• Grouping data in an NSMutable array

  - by padatronic

  Hi guys, I have an array i load with lots of data from an xml file. I am displaying this on a tableview and then when you click on say an author it goes through to display all their books. At the minute my NSMutableArray has an entry for every each book with title, author and so on. So in the table of authors it display the authors name as many times as they have books. I want to group the array data so the table only displays each author once but the author contains an array of his books. Seems simple but I can't find a group method for arrays. thanks peeps

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• Save images to resource folder from photolibrary

  - by Viral

  hi, I want to save images selected from photo library to my resource folder in xcode. So that i can do some operation on newly selected image. SO any one know how to do this?? Regards viral

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• Get EXEC_BAD_ACCESS when I get the NSFileModificationDate

  - by Toto

  Hi everyone, I try to get the last modification date of a file: NSFileManager *fm = [[NSFileManager alloc] init]; NSError *err; NSDate *lastModif = [[fm attributesOfItemAtPath:filename error:&err] objectForKey:NSFileModificationDate];//filename is ok ;-) if(err == nil) { [lastModif retain]; //I can put a NSLog of lastModif here, it works !! NSTimeInterval lastModifDiff = [lastModif timeIntervalSinceNow];//crash here } I don't understand why the NSDate seems to be released, why the retain does not retain it. Thank you if you have any idea...

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• Getting "Location" header from NSHTTPURLResponse

  - by aspcartman

  Can't get "Location" header from response at all. Wireshark says that i've got one: Location: http://*/index.html#0;sid=865a84f0212a3a35d8e9d5f68398e535 But NSHTTPURLResponse *hr = (NSHTTPURLResponse*)response; NSDictionary *dict = [hr allHeaderFields]; NSLog(@"HEADERS : %@",[dict description]); Produces this: HEADERS : { Connection = "keep-alive"; "Content-Encoding" = gzip; "Content-Type" = "text/html"; Date = "Thu, 25 Mar 2010 08:12:08 GMT"; "Last-Modified" = "Sat, 29 Nov 2008 15:50:54 GMT"; Server = "nginx/0.7.59"; "Transfer-Encoding" = Identity; } No location anywhere. How to get it? I need this "sid" thing.

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• Objective-C - How To Remove Characters From a String?

  - by iAm

  I have a UILable that has a formatted String (formatted for currency), so there is a dollar sign, $21.34. In the core data entity the attribute is of a type double, I am using an NSDecimalNumber to save to the database. self.purchase.name = self.nameTextField.text; NSString *string = self.amountLabel.text NSDecimalNumber *newAmount = [[NSDecimalNumber alloc] initWithString:string]; NSLog(@"%@", string); // THIS RETURNS NaN, because of dollar sign i think NSManagedObjectContext *context = self.purchase.managedObjectContext; NSError *error = nil; if (![context save:&error]) { NSLog(@"Unresolved error %@, %@", error, [error userInfo]); abort(); } Anyway, I need this to not be NaN, so my thinking is to remove the dollar sign, but i do not know how to do that, or perhaps there is a better way to accomplish my goal.

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• how to search files of particular extension in the entire device ?

  - by KayKay

  In my application, i am trying to find all files of particular extension (like .pdf, .txt, etc) that are stored in the whole device (not only in Home Directory) and want to list them in table View. Is it possible to do so and if it is then can i associate file of specific extension to get it open in supporting application (any third party plug-ins).I went through numerous documentation but couldn't find the solution. Also how can i index files of these extension for fast search. Any help is appreciated. Thanks.

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• NSTableViewCell uses value from other cells

  - by Michael Z

  Hi Guys: I have problem with using dequeueReusableCellWithIdentifier method. Whenever I use this one, one cell would display its own value and value that does not belong to it. This first and second images show the problem, while the third image shows the proper data.The problem seems to be caused by old value not being wiped off and the new value being added on top if it. Which seems very strange.

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• MPMoviePlayerView fade in/out of overlay

  - by therobot

  I've got a MPMoviePlayerViewController, and I've added an overlay as a subview to the MPMoviePlayerController.view that it controls. Does anyone know if there's an easy way to make my added overlay fade in and out with the rest of the controls? My code to initialize and present the player is: LandscapeMPVC * theMovieViewController = [[LandscapeMPVC alloc] initWithContentURL:sourceURL]; MPMoviePlayerController * theMoviePlayer = [theMovieViewController moviePlayer]; [theMoviePlayer setRepeatMode:MPMovieRepeatModeOne]; [theMoviePlayer setScalingMode:MPMovieScalingModeAspectFit]; [theMoviePlayer setFullscreen:YES]; // Attemps at overlays MPViewOverlayController * overlayCont = [[MPViewOverlayController alloc] init]; [[theMovieViewController view] addSubview:overlayCont.view]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(resetToolbar:) name:MPMoviePlayerPlaybackDidFinishNotification object:theMoviePlayer]; [self presentMoviePlayerViewControllerAnimated:theMovieViewController]; LandscapeMPVC is just a subclass of MoviePlayerViewController where I overwrite the orientation code. When the rest of the controls fade in the movie player, my custom overlay does not. Is there some code in the controller that I need to add, or some notification that is sent? Any input would be greatly appreciated.

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• Open Source sound engine

  - by Steph Thirion

  When I started using SoundEngine (from CrashLanding and TouchFighter), I had read about a few people recommending not to use it, for it was, according to them, not stable enough. Still it was the only solution I knew of to play sounds with pitch and position control without learning C++ and OpenAL, so I ignored the warnings and went on with it. But now I'm starting to worry. The 2.2 SDK introduced AVFoundation. Using both SoundEngine from CrashLanding (for sounds) and AVAudioPlayer (for music), I found out SoundEngine behaves strangely when the only existing AVAudioPlayer is released (all sounds stop until a new AVAudioPlayer is initiated). Around the same time as the 2.2 SDK came out, the CrashLanding sample code was mysteriously removed from the ADC site. I'm worried there are more bad surprises to come. My question is, is anyone aware of an Open Source alternative to SoundEngine? Maybe even a C++ library that uses OpenAL?

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• How do you implement an MPVolumeView?

  - by Emil

  Hey! I want the user to be able to change the system volume with a slider, and I realized the only way to do this is with an MPVolumeView. But I can't find any example code for it, and every method I try to implement won't show up. So what is the easiest and correct, working way of implementing a MPVolumeView?

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• How can I store Google Maps search results in an array?

  - by Thomas

  Hi All, I'm working on an app where I need to query Google for businesses near a current location. How do I go about storing them in an array? I don't want to exit the app and open Google Maps, I want to be able to display the addresses in a list format (Table View, I suppose). Any help would be greatly appreciated. Thanks! Thomas

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• can a uiviewcontroller push a uitabbarcontroller?

  - by Sheehan Alam

  if so, how do i setup my uitabbarcontroller in IB? all the examples ive seen create the uitabbarcontroller in the app delegate.

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• Second call to AVAudioPlayer -> EXC_BAD_ACCESS (code posted, what did I miss?)

  - by Jordan

  I'm using this code to play a different mp3 files with every call. The first time through works great. The second time crash, as indicated below. .h AVAudioPlayer *player; @property (nonatomic, retain) AVAudioPlayer *player; .m -(void)load:(NSURL *)aFileURL { if (aFileURL) { AVAudioPlayer *newPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL: aFileURL error: nil]; [aFileURL release]; self.player = newPlayer; // CRASHES HERE EXC_BAD_ACCESS with second MP3a [newPlayer release]; [self.player prepareToPlay]; [self.player setDelegate:self]; } } I know I must have missed something, any ideas?

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• NSURLConnection and empty post variables

  - by SooDesuNe

  I'm at my wits end with this one, because I've used very similar code in the past, and it worked just fine. The following code results in empty $_POST variables on the server. I verified this with: file_put_contents('log_file_name', "log: ".$word, FILE_APPEND); the only contents of log_file_name was "log: " I then verified the PHP with a simple HTML form. It performed as expected. The Objective-C: NSString *word = "this_word_gets_lost"; NSString *myRequestString = [NSString stringWithFormat:@"word=%@", word]; [self postAsynchronousPHPRequest:myRequestString toPage:@"http://www.mysite.com/mypage.php" delegate:nil]; } -(void) postAsynchronousPHPRequest:(NSString*)request toPage:(NSString*)URL delegate:(id)delegate{ NSData *requestData = [ NSData dataWithBytes: [ request UTF8String ] length: [ request length ] ]; NSMutableURLRequest *URLrequest = [ [ NSMutableURLRequest alloc ] initWithURL: [ NSURL URLWithString: URL ] ]; [ URLrequest setHTTPMethod: @"POST" ]; [ URLrequest setHTTPBody: requestData ]; [ NSURLConnection connectionWithRequest:URLrequest delegate:delegate]; [URLrequest release]; } The PHP: $word = $_POST['word']; file_put_contents('log_file_name', "log: ".$word, FILE_APPEND); What am I doing wrong in the Objective-C that would cause the $_POST variable to be empty on the server?

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• When I mark a property as transient, does the type matter?

  - by mystify

  For example, I make a fullName property and set it to transient. Does it matter what data type that property is, in this case? For example, does it matter if it's set to int or string? As far as I get it, a transient property is almost "ignored" by Core Data. I make my accessors for that and when someone accesses fullName, I simply construct a string and return that. Did I miss something?

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• Dynamically calculate frequency value.

  - by MS Nathan

  Hi, In my app, I want to find/calculate the audio frequency as dynamically when i am recording an audio and no need to save, play and all. Now i am trying to do that with help of an aurioToch sample code. In that sample, inside FFTBufferManager class methods such as GrabAudioData and ComputeFFT,Here I am not able to find where they are calculating frequency value as dynamically depends on the audio sound and I spent more than 5 days.please help me.

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• Root view controllers and modal dialogs

  - by Tony

  In a custom UIViewController, if I have a member UINavigationController that I initialize with self as the root view, like this: navController = [[UINavigationController alloc] initWithRootViewController:self]; then presenting a modal dialog does not hide the tab bar at the bottom of the screen. The result is that if the user switches to a different tab while a modal dialog is displayed, when they pop back to the tab that was displaying a modal dialog then subsequent calls to presentModalViewController do not display a modal dialog at all, even if I call dismissModalViewControllerAnimated as a result of the tab switch. If I initialize the UINavigationController with out setting self as the root controller, navigationController = [[UINavigationController alloc] init]; then the tab bar is hidden as expected. I've changed things in my program so that this isn't really an issue for me anymore, but I'm not sure that I understand why this is happening. Is it considered bad practice to have a navigation controller with self as the root, if the nav controller is going to be displaying modal dialogs?

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• touchesEnded Sound?

  - by NextRev

  I'm trying to play a sound on touchesEnded but I'm having a problem. There are multiple objects that get moved around, so if the below code holds true when any object is moved, it constantly plays the sound. How do I only play it once? -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{ if(CGRectContainsRect([image1 frame], [image2 frame])){ [self playsound]; } }

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• loading custom view using loadNibNamed showing memory leaks

  - by user307550

  I have a number of custom table cells and views that I built using interface builder In interface builder, everything is set up similarly. There is a table cell and a couple other UILabels and a background image Object owner if the nib is NSObject Class for the table cell is the name of the class for my table cell Here is how I create the table cell in my code: SectionedSwitchTableCell *cell = nil; NSArray *nibs = [[NSBundle mainBundle] loadNibNamed:kSectionedSwitchTableCellIdentifier owner:owner options:nil]; for(id currentObject in nibs) { if([currentObject isKindOfClass:[SectionedSwitchTableCell class]]) { cell = (SectionedSwitchTableCell *)currentObject; break; } } return cell; For my custom table headers I have this NSArray *nibs = [[NSBundle mainBundle] loadNibNamed:@"CustomTableHeader" owner:self options:nil]; for(id currentObject in nibs) { if([currentObject isKindOfClass:[CustomTableHeader class]]) { return header } } In my .h and .m files for the custom view, I have IBOutlet, @property set up for everything except for the background image UIImageView. Everything that has the IBOutlet and @property are also @synthesized and released in the .m file. Leaks is showing that I have memory leaks with CALayer when I create these custom view objects. Am I doing something wrong here when I create these custom view objects? I'm kind of tearing my hair out trying to figure out where these leaks are coming from. As a side note, I have a UIImageView background image defined in these custom views but I didn't define properties and IBOutlets in my .h and .m files. Defining them doesn't make a difference when I run it through Leaks but just wanted to confirm if I'm doing the right thing. Any input would be super helpful. Thanks :)

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• Asynchronous Request make for-Loop waiting for didFinishLoading

  - by rdesign

  Hey guys, I have a asynchronous url request within a for loop. This loop is called 20 times, each time one parameter of the webaddress is changed. Everytime the didFinishLoading method is called I want to hand over the data of this specific webadress. The problem now is that when I run the for loop, the didFinishLoading method is not called, only at the end. Any suggenstions on how to make the loop wait for complete loading the data for the specific URL? Thanks a lot.

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• How do I change the UIKeyboard when using the UISearchBar?

  - by Michael Yang

  I want to set the keyboard type of the UISearchBar to UIKeyboardAppearanceAlert, but I can't seem to access the UIKeyboard of the UISearchBar.

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