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• Convert charset name to NSStringEncoding

  - by d11wtq

  Given a charset string, such as "utf-8", "iso-8859-1", "us-ascii" etc, is there any built-in way to get the appropriate NSStringEncoding in Cocoa? Right now I'm looking at just building a NSDictionary containing a canonicalized version of the name mapped to the NSStringEncoding, then having a lookup mechanism that canonicalizes the input in the same way. But is there really no way to get NSUTF8StringEncoding given the string "UTF-8", etc?

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• Is NSNumberFormatter the only way to format an NSDecimalNumber?

  - by Paul Alexander

  I'm using an NSDecimalNumber to store money in Core Data. I naively used stringWithFormat: at first to format the value, later realizing that it didn't support NSDecimalNumber and was instead formatting the pointer :(. So after some reading through the docs I learned to use the NSNumberFormatter to get the format I wanted. But this just strikes me as the "hard way". Is there any easier way than this:? NSNumberFormatter * formatter = [[NSNumberFormatter alloc] init]; [formatter setNumberStyle: NSNumberFormatterCurrencyStyle]; priceField.text = [formatter stringFromNumber: ent.price]; [formatter release];

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• Custom logo on top of UINavigationBar?

  - by Zachary Hinchliffe

  I've read plenty of requests about a full-on custom UINavigationBar background, but what I want is to overlay a logo on the default UINavigationBar instead of text. Preferably, I'd like to apply it to a subclass of UINavigationBar called CustomNavigationBar. Thanks in advance.

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• Navigation (controller) in Tabbar (c) in Navigation (c) (iphone)

  - by Jonathan

  I want to have a TabBar controller inside a navigation controller. So that when an item is selected on the first Navigation Controller it pushes the TabBar into view. Inside this tabbar on the first tab is another navigation controller. However I only want one navigation bar. I've come up with 2 ways but not sure which way is better (Ie more acceptable etc)? 1) The first navigation controller isn't actually a navigation controller but to the user it looks like one. So when a cell is selected on it's table view the first navC's view is removed from the superview and the TabBarC's view is added, animation would have to be done manually. 2)The first NavC is actually a NavC and when an item is selected and the TabBar is pushed on to the screen the first NavC's navigationbar is hidden so that the first tab's navigationBar is the only nav bar on screen.

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• Is it possible to reset NSURLConnection after providing credentials?

  - by John

  I am calling a REST service that requires basic auth and I respond to the didReceiveAuthenticationChallenge delegate OK NSURLCredential *credential = [[NSURLCredential alloc] initWithUser:self.user password:self.password persistence:NSURLCredentialPersistenceForSession]; [[challenge sender] useCredential:credential forAuthenticationChallenge:challenge]; [credential release]; The Credentials are valid for the Session but I would like for my App to be able to switch between servers and therefore need to "reset" the Session so it asks again for a challenge. I can of course try the option of not storing the credentials for the Session and supply them for each call but this does not seem like a good idea. Any ideas would be appreciated!

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• Xcode - Terminating due to uncaught exception for iphone app

  - by Dave

  When I try to cick on cell in my table view rather than take me to the next view I get a "Terminating due to uncaught exception" error. Here is the code from the debugger: 010-03-27 12:52:48.805 MultiDetailView[335:207] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[NSCFArray objectAtIndex:]: index (1) beyond bounds (1)' 2010-03-27 12:52:48.809 MultiDetailView[335:207] Stack: ( 40849995, 2476418313, 40849435, 40849274, 592937, 50711, 5698680, 5701555, 5697083, 5705902, 11163, 3128431, 3089967, 191242, 40390524, 40386632, 49203357, 49203554, 2788833, 9060, 8914 ) Any ideas on what I should do ? Thanks.

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• Best way to change the background color for an NSView

  - by outtru.mp

  I'm looking for the best way to change the background color of an NSView. I'd also like to be able to set the appropriate alpha mask for the NSView. Something like: myView.backgroundColor = [NSColor colorWithCalibratedRed:0.227f green:0.251f blue:0.337 alpha:0.8]; I notice that NSWindow has this method, and I'm not a big fan of the NSColorWheel, or NSImage background options, but if they are the best, willing to use.

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• Operation could not be completed. AVAudioRecorder iphone SDK

  - by Jonathan

  I am trying to record using the iphones microphone: This is my code: NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; // the path to write file NSString *appFile = [documentsDirectory stringByAppendingPathComponent:@"testing.mp3"]; NSURL *url = [NSURL fileURLWithPath:appFile isDirectory:NO]; NSDictionary *settings = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithFloat: 44100.0], AVSampleRateKey, [NSNumber numberWithInt: kAudioFormatMPEGLayer3], AVFormatIDKey, [NSNumber numberWithInt: 1], AVNumberOfChannelsKey, [NSNumber numberWithInt: AVAudioQualityLow], AVEncoderAudioQualityKey, nil]; NSError *error; recorder = [[AVAudioRecorder alloc] initWithURL:url settings:settings error:&error]; if ([recorder prepareToRecord] == YES){ [recorder record]; }else { int errorCode = CFSwapInt32HostToBig ([error code]); NSLog(@"Error: %@ [%4.4s])" , [error localizedDescription], (char*)&errorCode); } NSLog(@"BOOL = %d", (int)recorder.recording); This is the error I get: Operation could not be completed. (OSStatus error 1718449215.) And I can not work out why this doesn't work, as a lot of the code I got from a website. Jonathan

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• Trigerring other animation after first ending Animation (Objetive-C)

  - by ludo

  Hi, I have a simple animation which simply modify the position of a button: [UIView beginAnimation:nil context:nil]; [UIView setAnimationsDuration:3.0]; [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut]; mybutton.frame = CGREctMake(20, 233, 280, 46); [UIView commitAnimations]; I want to perform some other animations when this one is finish, how to do that?

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• How to detect touches on MPMoviePlayerController window and still having the standard playback cont

  - by gkedmi

  Hello I have the MPMoviePlayerController set up to play a movie.I want to detect a touch on the movie for bringing up few buttons.I used the code : // The movie's window is the one that is active UIWindow* moviePlayerWindow = [[UIApplication sharedApplication] keyWindow]; // Now we create an invisible control with the same size as the window UIControl* overlay = [[[UIControl alloc] initWithFrame:moviePlayerWindow.frame]autorelease]; // We want to get notified whenever the overlay control is touched [overlay addTarget:self action:@selector(movieWindowTouched:) forControlEvents:UIControlEventTouchDown]; // Add the overlay to the window's subviews [moviePlayerWindow addSubview:overlay]; but then the play back controllers doesn't appear , I guess because the player window doesn't get the touch.how can I keep the player controllers and still detects touches? thanks

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• Memory leak issue with UIImagePickerController

  - by Mustafa

  I'm getting memory leak with UIImagePickerController class. Here's how I'm using it: UIImagePickerController *picker = [[UIImagePickerController alloc] init]; picker.delegate = self; picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; [self presentModalViewController:picker animated:YES]; [picker release]; To remove the picker i call [picker dismissModalViewControllerAnimated:YES]; in didFinishPickingImage and imagePickerControllerDidCancel. -- Instruments show around 160bytes leaking as a result of this instruction: +[UIImagePickerController _loadPhotoLibraryIfNecessary] Apparently this issue has and is disturbing many people, and solution to avoid this problem is to build a singleton class dedicated for picking images from library or capturing using device's build in camera. Anyone want to add something?

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• parsing simple html for iphone

  - by sitara

  I have a very simple html page to parse. The html page will remain simple always. as simple as this <html> <head><title>title</title></head> <body>some data here</body> </html> I have fetched the html content of such an html page and have it in an NSString. I want to get what ever data is there in the body of the html page. Please tell me how can this be done and let me know if there are more than one possible ways. I would prefer doing it using basic obj-c if it is possible. Thanks

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• UIScrollView and UIImage in it with paging enabled

  - by Infinity

  Hello guys! I need to display 10 - 1000 images on a UIScrollView. Paging is enabled. So every page of the scrollview is an image, it is an uiimage. I can load 10 images to 10 uiimages which stays in the memory, but with 1000 images I have problems on the iPhone or on the iPad. I am trying to unload and then load the images when I am doing scrolling. I every time displays 3 images. The current page image, and the -1 and +1 pages. When I am scrolling I unload the image and then load the next. With this method I have two problems. The scrolling is laggy and if I scroll very fast the images don't appear. Maybe is there any good solution for these problems? Can you suggest me one?

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• Delete a photo from the user's photo library?

  - by Jacob Relkin

  Hi, Is there a way I can delete an image that is loaded into my app from a UIImagePickerController? I want to be able to delete the image from the user's photo library when the user performs a specific action. I am prompting the user to choose a image from their library, then it gets loaded into my app at which point the app does some shnazzy animation, then actually deletes the image. Please help!

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• How do I convert a wstring to a NSString

  - by Harald Maassen

  I tried [NSString stringWithUTF8String:(const char*)(myWString.c_str())] but that returns a single character string. This is on the iPhone by the way, if that matters any :)

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• Can I use UIRefreshControl with UICollectionViewScrollDirectionHorizontal?

  - by Dan Abramov

  You can add UIRefreshControl to UICollectionView (or any UIScrollView for that matter) by adding it to collection's subviews: UIRefreshControl *refreshControl = [[UIRefreshControl alloc] init]; [refreshControl addTarget:self action:@selector(handleRefresh:) forControlEvents:UIControlEventValueChanged]; [self.collectionView addSubview:refreshControl]; This doesn't work when collection view layout has UICollectionViewScrollDirectionHorizontal. I tried overriding layoutSubviews to put refresh control to the left, but it wouldn't track scrolling progress this way. Can I trick it into working with horizontal layouts?

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• Why won't my UISearchDisplayController fire the didSelectRowAtIndexPath moethod?

  - by John Wells

  I am having an odd problem when searching a UITableView using a UISearchDisplayController. The UITableViewController is a subclass of another UITableViewController with a working didSelectRowAtIndexPath method. Without searching the controller handles selections fine, sending the superclass a didSelectRowAtIndexPath call, but if I select a cell when searching the superclass receives nothing but the cell is highlighted. Below is the code from my subclass. @implementation AdvancedViewController @synthesize searchDisplayController, dict, filteredList; - (void)viewDidLoad { [super viewDidLoad]; // Programmatically set up search bar UISearchBar *mySearchBar = [[UISearchBar alloc] init]; mySearchBar.delegate = self; [mySearchBar setAutocapitalizationType:UITextAutocapitalizationTypeNone]; [mySearchBar sizeToFit]; self.tableView.tableHeaderView = mySearchBar; // Programmatically set up search display controller searchDisplayController = [[UISearchDisplayController alloc] initWithSearchBar:mySearchBar contentsController:self]; [self setSearchDisplayController:searchDisplayController]; [searchDisplayController setDelegate:self]; [searchDisplayController setSearchResultsDataSource:self]; // Parse data from server NSData * jsonData = [NSData dataWithContentsOfURL:[NSURL URLWithString:url]]; NSArray * items = [[NSArray alloc] initWithArray:[[CJSONDeserializer deserializer] deserializeAsArray:jsonData error:nil]]; // Init variables dict = [[NSMutableDictionary alloc] init]; listIndex = [[NSMutableArray alloc] init]; fullList = [[NSMutableArray alloc] init]; filteredList = [[NSMutableArray alloc] init]; // Get each item and format it for the UI for(NSMutableArray * item in items) { // Get the first letter NSString * firstKey = [[[item objectAtIndex:0] substringWithRange:NSMakeRange(0,1)] uppercaseString]; // Put symbols and numbers in the same section if ([[firstKey stringByTrimmingCharactersInSet:[[NSCharacterSet letterCharacterSet] invertedSet]] isEqualToString:@""]) firstKey = @"#"; // If there isn't a section with this key if (![listIndex containsObject:firstKey]) { // Add the key to the index for faster access (because it's already sorted) [listIndex addObject:firstKey]; // Add the key to the unordered dictionary [dict setObject:[NSMutableArray array] forKey:firstKey]; } // Add the object to the dictionary [[dict objectForKey:firstKey] addObject:[[NSMutableDictionary alloc] initWithObjects:item forKeys:[NSArray arrayWithObjects:@"name", @"url", nil]]]; // Add the object to the list for simple searching [fullList addObject:[[NSMutableDictionary alloc] initWithObjects:item forKeys:[NSArray arrayWithObjects:@"name", @"url", nil]]]; } filteredList = [NSMutableArray arrayWithCapacity:[fullList count]]; } #pragma mark - #pragma mark Table view data source // Custom method for object oriented data access - (NSString *)tableView:(UITableView *)tableView dataForRowAtIndexPath:(NSIndexPath *)indexPath withKey:(NSString *)key { return (NSString *)((tableView == self.searchDisplayController.searchResultsTableView) ? [[filteredList objectAtIndex:indexPath.row] objectForKey:key] : [[[dict objectForKey:[listIndex objectAtIndex:indexPath.section]] objectAtIndex:indexPath.row] valueForKey:key]); } - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return (tableView == self.searchDisplayController.searchResultsTableView) ? 1 : (([listIndex count] > 0) ? [[dict allKeys] count] : 1); } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return (tableView == self.searchDisplayController.searchResultsTableView) ? [filteredList count] : [[dict objectForKey:[listIndex objectAtIndex:section]] count]; } - (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView { return (tableView == self.searchDisplayController.searchResultsTableView) ? [[NSArray alloc] initWithObjects:nil] : listIndex; } - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { return (tableView == self.searchDisplayController.searchResultsTableView) ? @"" : [listIndex objectAtIndex:section]; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *kCellID = @"cellID"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:kCellID]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:kCellID] autorelease]; cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; } NSString * name = nil; // TODO: Make dataForRowAtIndexPath work here if (tableView == self.searchDisplayController.searchResultsTableView) { // NOTE: dataForRowAtIndexPath causes this to crash for some unknown reason. Maybe it is called before viewDidLoad and has no data? name = [[filteredList objectAtIndex:indexPath.row] objectForKey:@"name"]; } else { // This always works name = [self tableView:[self tableView] dataForRowAtIndexPath:indexPath withKey:@"name"]; } cell.textLabel.text = name; return cell; } #pragma mark Search Methods - (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope { // Clear the filtered array [self.filteredList removeAllObjects]; // Filter the array for (NSDictionary *item in fullList) { // Compare the item's name to the search text NSComparisonResult result = [[item objectForKey:@"name"] compare:searchText options:(NSCaseInsensitiveSearch|NSDiacriticInsensitiveSearch) range:NSMakeRange(0, [searchText length])]; if (result == NSOrderedSame) { // Add to the filtered array if it matches [self.filteredList addObject:item]; } } } - (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString { [self filterContentForSearchText:searchString scope: [[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:[self.searchDisplayController.searchBar selectedScopeButtonIndex]]]; // Return YES to cause the search result table view to be reloaded. return YES; } - (void)viewDidUnload { filteredList = nil; } @end

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• iPhone UITableView populateing from connectionDidFinishLoading

  - by fourfour

  Hey all. I have been trying for hours to figure this out. I have some JSON from a NSURLConnection. This is working fine and I have parsed it into an array. But I can't seem to get the array out of the connectionDidFinishLoading method. I an am getting (null) in the UITableViewCell method. I am assuming this is a scope of retain issue, but I am so new to ObjC I am not sure what to do. Any help would be greatly appreciated. Cheers. -(void)connectionDidFinishLoading:(NSURLConnection *)connection { [connection release]; NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding]; [responseData release]; SBJSON *json = [[SBJSON alloc] init]; NSDictionary *results = [json objectWithString:responseString]; self.dataArray = [results objectForKey:@"data"]; NSMutableArray *tableArray = [[NSMutableArray alloc] initWithObjects:nil]; for (NSString *element in dataArray) { //NSLog(@"%@", [element objectForKey:@"name"]); NSString *tmpString = [[NSString alloc] initWithString:[element objectForKey:@"name"]]; [tableArray addObject:tmpString]; } } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; } // Configure the cell. //cell.textLabel.text = [self.tableView objectAtIndex:indexPath.row]; cell.textLabel.text = [self.tableArray objectAtIndex:indexPath.row]; NSLog(@"%@", tableArray); return cell; }

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• Saving custom attributes in NSAttributedString

  - by regulus6633

  I need to add a custom attribute to the selected text in an NSTextView. So I can do that by getting the attributed string for the selection, adding a custom attribute to it, and then replacing the selection with my new attributed string. So now I get the text view's attributed string as NSData and write it to a file. Later when I open that file and restore it to the text view my custom attributes are gone! After working out the entire scheme for my custom attribute I find that custom attributes are not saved for you. Look at the IMPORTANT note here: http://developer.apple.com/mac/library/DOCUMENTATION/Cocoa/Conceptual/AttributedStrings/Tasks/RTFAndAttrStrings.html So I have no idea how to save and restore my documents with this custom attribute. Any help?

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• How to make a UITextField move up when keyboard is present

  - by philfreo

  EDIT: Over 1k views with 3 upvotes? If this question is helpful, vote it up :) With the iPhone SDK: I have a UIView with UITextFields that brings up a keyboard. I need it to be able to: Allow scrolling of the contents of the UIScrollView to see the other text fields once the keyboard is brought up Automatically "jump" (by scrolling up) or shortening I know that I need a UIScrollView. I've tried changing the class of my UIView to a UIScrollView but I'm still unable to scroll the textboxes up or down. Do I need both a UIView and a UIScrollView? Does one go inside the other? [EDIT: I now know that you want a UIView inside of a UIScrollView, and the trick is to programatically set the content size of the UIScrollView to the frame size of the UIView.] Then what needs to be implemented in order to automatically scroll to the active text field? Ideally as much of the setup of the components as possible will be done in Interface Builder. I'd like to only write code for what needs it. Note: the UIView (or UIScrollView) that I'm working with is brought up by a tabbar (UITabBar), which needs to function as normal. Edit: I am adding the scroll bar just for when the keyboard comes up. Even though it's not needed, I feel like it provides a better interface because then the user can scroll and change textboxes, for example. I've got it working where I change the frame size of the UIScrollView when the keyboard goes up and down. I'm simply using: -(void)textFieldDidBeginEditing:(UITextField *)textField { //Keyboard becomes visible scrollView.frame = CGRectMake(scrollView.frame.origin.x, scrollView.frame.origin.y, scrollView.frame.size.width, scrollView.frame.size.height - 215 + 50); //resize } -(void)textFieldDidEndEditing:(UITextField *)textField { //keyboard will hide scrollView.frame = CGRectMake(scrollView.frame.origin.x, scrollView.frame.origin.y, scrollView.frame.size.width, scrollView.frame.size.height + 215 - 50); //resize } However this doesn't automatically "move up" or center the lower text fields in the visible area, which is what I would really like.

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• unrecognized selector sent to instance on deviceOrientationDidChange

  - by clopez

  Right now my app should only supports Portrait. On Summary/Supported Device Orientations I have only selected Portrait so I'm hoping that my app will not rotate. I was testing the app on a device and suddenly I'm getting the following error randomly: [UIButtonContent deviceOrientationDidChange:]: unrecognized selector sent to instance It happens when I rotate the device SOMETIMES, is not consistent, and is not always over UIBUttonContent. I supposed that if I only select Portrait, deviceOrientationDidChange should not be called or should be ignored. Other times my app crashes with an EXC_BAD_ACCESS (code=1, address=something) but it happens when I rotate the device so I'm guessing that both errors are related. I don't know what to do with this, it's hard to debug because I don't have feedback, the All Exceptions Breakpoint is not being called, so I don't know where and exactly why this is happening. Any idea on how to debug this is welcome.

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• Outlets buggy, causing crash?

  - by Moshe

  I've been having issues with making outlets and I was wondering if there is a difference and what the difference could be... EDIT: Using Outlets seem to be causeing SIGABRT errors... // // hebOmer.h // tizkorPush // // Created by Moshe -...- . // Copyright 2010 __MyCompanyName__. All rights reserved. // #import <UIKit/UIKit.h> #import "support.h" #import "hdate.h" @interface hebOmer : UIViewController{ IBOutlet UIScrollView * hebrewScrollView; UILabel *hebrewOmer; } @property (nonatomic, retain) UIScrollView * hebrewScrollView; @property (nonatomic, retain) IBOutlet UILabel *hebrewOmer; @end Creating an outlet to the UILabel is causing problems. The implementation seems fine. @synthesize and the memory release functions were called properly.

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• Delay in playing sounds using AVAudioPlayer

  - by iSharreth

  -(IBAction)playSound{ AVAudioPlayer *myExampleSound; NSString *myExamplePath = [[NSBundle mainBundle] pathForResource:@"myaudiofile" ofType:@"caf"]; myExampleSound =[[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:myExamplePath] error:NULL]; myExampleSound.delegate = self; [myExampleSound play]; } I want to play a beep sound when a button is clicked. I had used the above code. But it is taking some delay in playing the sound. Anyone please help.

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• setting background image of UIToolBar in iphone

  - by abdulsamad

  Hi all, I want to set some background image of uitoolbar in my iphone application. Currently i am setting by using the initwithpatternimage method of uicolor. But its not doing what i want. Kindly sujjest some other solution.

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• How much overhead does a msg_send call incur?

  - by pxl

  I'm attempting to piece together and run a list of tasks put together by a user. These task lists can be hundreds or thousand of items long. From what I know, the easiest and most obvious way would be to build an array and then iterate through them: NSArray *arrayOfTasks = .... init and fill with thousands of tasks for (id *eachTask in arrayOfTasks) { if ( eachTask && [eachTask respondsToSelector:@selector(execute)] ) [eachTask execute]; } For a desktop, this may be no problem, but for an iphone or ipad, this may be a problem. Is this a good way to go about it, or is there a faster way to accomplish the same thing? The reason why I'm asking about how much overhead a msg_send occurs is that I could also do a straight C implementation as well. For example, I could put together a linked list and use a block to handle the next task. Will I gain anything from that or is it really more trouble than its worth?

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