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• UIDatePicker questions regarding displaying

  - by Zap

  Does anyone know if it's possible to change the minute interval of a UIDatePicker after it's been added to a UIView? Is it possible to show and hide 2 different datePickers? I want change the minuteInterval of the UIDatePicker to 5 and 30 when I click a button. Any sample code would be appreciated.

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• Get size of UIView after applying CGAffineTransform

  - by Ican Zilb

  I was surprised not to find an answer to this question, maybe is something very simple I somehow overlook : How to get the real size of an UIView after I apply a CGAffineTransform to it? eg. my UIView has size 300 x 200, I apply a scaling transform let's say factor 2 both horizontal and vertical, so the UIView now takes 600 x 400 on the screen, but it's bounds and it's layer's bounds are still returning a size of 300 x 200 ... where do I find the real size of the UIView ?

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• UIWebView/MPMoviePlayerController and the "Done" button

  - by David Sowsy

  I am using the UIWebView to load both streaming audio and video. I have properly set up the UIWebView delegate and I am receiving webViewDidStartLoading and webViewFinishedLoading events perfectly. The webview launches a full screen window (likely a MPMoviePlayerController) Apple's MoviePlayer example gets the array of Windows to determine which window the moviePlayerWindow is for adding custom drawing/getting at the GUI components. I believe this to be a bad practice/hack. My expectation is that I should be able to figure out when that button was clicked by either a delegate method or an NSNotification. It may also be the case that I have to poke around subviews or controllers with isKindOf calls, but I don't think those are correct approaches. Are my expectations incorrect, and if so, why? What is the correct way to bind an action to that "Done" button?

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• Outputting a bar chart to an iPhone application?

  - by Moddy

  Right, I really want to output a Bar Graph to an Obj-C iPhone application - now I may be missing a vital SDK class or something; but right now my solution is to embed a WebView and inside that have a JQuery/Flot based graph - not totally ideal I know! Just wondering if anybody has any other creative solutions or whether a WebView/AJAX solution is the way to go? (For the record; my data source will be figures returned from an external source - i.e downloaded from the internet. So I was even toying with having a PHP Proxy/script do all the work on that, return the figures AND a graph to the application - but then I risk placing extra strain on the server!)

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• could I know which file is altered using fsevent?

  - by Frost Li

  I get the directory path from fsevent, such as "/User/Data/" But what I really want is "/User/Data/change.txt" I have read the programming guide, it said typedef void ( *FSEventStreamCallback )( ConstFSEventStreamRef streamRef, void *clientCallBackInfo, size_t numEvents, void *eventPaths, const FSEventStreamEventFlags eventFlags[], const FSEventStreamEventId eventIds[]); eventPaths An array of paths to the directories in which event(s) occurred. is there any method to find out which file is altered? thanks!!!! I have stuck to it for so long..

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• How to have two UIPickerViews together in one ViewController?

  - by 0SX

  I'm trying to put 2 UIPickerViews together in one ViewController. Each UIPickerView has different data arrays. I'm using interface builder to link the pickers up. I know I'll have to use separate delegates and dataSources but I can't seem to hook everything up with interface builder correctly. Here's all my code: pickerTesting.h #import <UIKit/UIKit.h> #import "picker2DataSource.h" @interface pickerTestingViewController : UIViewController <UIPickerViewDelegate, UIPickerViewDataSource>{ IBOutlet UIPickerView *picker; IBOutlet UIPickerView *picker2; NSMutableArray *pickerViewArray; } @property (nonatomic, retain) IBOutlet UIPickerView *picker; @property (nonatomic, retain) IBOutlet UIPickerView *picker2; @property (nonatomic, retain) NSMutableArray *pickerViewArray; @end pickerTesting.m #import "pickerTestingViewController.h" @implementation pickerTestingViewController @synthesize picker, picker2, pickerViewArray; - (void)viewDidLoad { [super viewDidLoad]; pickerViewArray = [[NSMutableArray alloc] init]; [pickerViewArray addObject:@" 100 "]; [pickerViewArray addObject:@" 200 "]; [pickerViewArray addObject:@" 400 "]; [pickerViewArray addObject:@" 600 "]; [pickerViewArray addObject:@" 1000 "]; [picker selectRow:1 inComponent:0 animated:NO]; picker2.delegate = self; picker2.dataSource = self; } - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)picker; { return 1; } - (void)pickerView:(UIPickerView *)picker didSelectRow:(NSInteger)row inComponent:(NSInteger)component { } - (NSInteger)pickerView:(UIPickerView *)picker numberOfRowsInComponent:(NSInteger)component; { return [pickerViewArray count]; } - (NSString *)pickerView:(UIPickerView *)picker titleForRow:(NSInteger)row forComponent:(NSInteger)component; { return [pickerViewArray objectAtIndex:row]; } - (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Release any cached data, images, etc that aren't in use. } - (void)viewDidUnload { // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; } - (void)dealloc { [super dealloc]; } @end And I have a separate class for the other datasource. picker2DataSource.h @interface picker2DataSource : NSObject <UIPickerViewDataSource, UIPickerViewDelegate> { NSMutableArray *customPickerArray; } @property (nonatomic, retain) NSMutableArray *customPickerArray; @end picker2DataSource.m #import "picker2DataSource.h" @implementation picker2DataSource @synthesize customPickerArray; - (id)init { // use predetermined frame size self = [super init]; if (self) { customPickerArray = [[NSMutableArray alloc] init]; [customPickerArray addObject:@" a "]; [customPickerArray addObject:@" b "]; [customPickerArray addObject:@" c "]; [customPickerArray addObject:@" d "]; [customPickerArray addObject:@" e "]; } return self; } - (void)dealloc { [customPickerArray release]; [super dealloc]; } - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)picker2; { return 1; } - (void)pickerView:(UIPickerView *)picker2 didSelectRow:(NSInteger)row inComponent:(NSInteger)component { } - (NSInteger)pickerView:(UIPickerView *)picker2 numberOfRowsInComponent:(NSInteger)component; { return [customPickerArray count]; } - (NSString *)pickerView:(UIPickerView *)picker2 titleForRow:(NSInteger)row forComponent:(NSInteger)component; { return [customPickerArray objectAtIndex:row]; } @end Any help or code examples would be great. Thanks.

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• How do I programmatically duplicate UIViews built in interface builder?

  - by Cam Spiers

  I want to build up a sub-UIView in Interface Builder (contained within a UIScrollView) with some UILabels contained, I then want to programmatically "copy" this view adjust its left position (by multiples of its width) to achieve a "floating" left effect inside a UIScrollView. I then want to add this copied UIView back into the UIScrollView with different text for the UILabels. The problem is I don't know how and if you can "copy" UIViews.

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• Why does this only work sometimes? (UITextView resign first responder question)

  - by RexOnRoids

  When a user presses the "SEND"(return) button I want the keyboard to retract and do other stuff like send a message. But it only works SOMETIMES... Why does this code only work SOMETIMES? I need it to work all the time obviously, but it doesn't. - (void)textViewDidChange:(UITextView *)inTextView { NSString *text = myTextView.text; if ([text length] > 0 && [text characterAtIndex:[text length] -1] == '\n') { myTextView.text = [text substringToIndex:[text length] -1]; [myTextView resignFirstResponder]; [self sendMessage]; } }

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• iPhone mapKit annotation for Current Location

  - by Simon

  Hello Im currently strugglung with annotations. how can i prevent the AnnotationLable for the blue GPS-point. (Here is an Image) - (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(MKAnnotation *) annotation{ if (annotation == mapView.userLocation) { return nil; } the function above isnt working, and i realized that i can't compare two coordinates. Any hint is welcome. Simon

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• A simple way to implement pathfinding using bullet physics - iPhone SDK

  - by Dave

  Hi, I have bullet physics set up and working on the iPhone but now I want to implement some sort of path finding with it. The problem is I have no idea where to start, the level is pretty simple just a lot of pillars that I want the 'bad guys' to navigate around to get to the player character. Do you have any suggestions or are there any tutorials you recommend for pathfinding using this on the iPhone?

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• Unable to access a primitive array inside a custom class from a UIViewController instance

  - by Daniel

  Hello! I have made a subclass of NSObject that is meant to be the model of my application. The class has a few methods and on instance primitive array as such: @interface Cube : NSObject { int cubeState[5][2][2]; } - (id)printContent; @end @implementation Cube - (void)init { if (self = [super init]) { for (int i=0; i<=5; i++) { for (int j=0; j<=2; j++) { for (int k=0; k<=2; k++) { cubeState[i][j][k] = i; } } } } return self; } - (void)printContent { for (int i=0; i<=5; i++) { for (int j=0; j<=2; j++) { for (int k=0; k<=2; k++) { NSLog(@"[%d] [%d] [%d] = %d", i, j, k, cubeState[i][j][k]); } } } } @end This works fine if instanciated from the delegate as such: #include "Cube.h" @implementation CubeAppDelegate @synthesize window; - (void)applicationDidFinishLaunching:(UIApplication *)application { Cube *cube = [[Cube alloc] init]; [cube printContent]; [cube release]; [window makeKeyAndVisible]; } However, the application crashes if I try to create a subclass of UIViewController with a Cube *cube property and later try to access the Cube instance object through the view controller's property as such: @interface CustomController : UIViewController { Cube *cube; } @property (nonatomic, retain) Cube *cube; @end @implementation CustomController @synthesize cube; - (void)dealloc { [cube release]; [super dealloc]; } @end and in the delegate: - (void)applicationDidFinishLaunching:(UIApplication *)application { viewController = [[CustomController alloc] initWithNibName:@"MainView" bundle:nil]; viewController.cube = [[[Cube alloc] init] autorelease]; [viewController.cube printContent]; // Application crashes here } Any ideas?

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• Push/Present Modal View Controller

  - by Yakattak

  I have a table in my view controller (let's call it TVC1). I have rows in TVC1 that are used so the user can input some more data in addition to the data on TVC1. So, when someone taps a specific row in TVC1, it will show another view controller (let's call it TVC2). However, when TVC2 is shown, all of the data in TVC1 is cleared. How can I save the data in TVC1? Should I do it through the app delegate? DescriptionInputViewController *descriptionController = [[DescriptionInputViewController alloc] initWithNibName:@"DescriptionInputView" bundle:nil]; [self presentModalViewController:navController animated:YES]; [self.navigationController pushViewController:descriptionController animated:YES]; [descriptionController release];

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• I get EXC_BAD_ACCESS when MaxConcurrentOperationCount > 1

  - by kudorgyozo

  Hello i am using NSOperationQueue to download images in the background. I have created a custom NSOperation to download the images. I put the images in table cells. The problem is if I do [operationQueue setMaxConcurrentOperationCount: 10] and i scroll down several cells the program crashes with EXC_BAD_ACCESS. Every time it crashes at the same place in the table. There are 3 cells one after the other which are for the same company and have the same logo so basically it should download the images 3 times. Every other time it works fine. - (void) main { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; NSURL *url = [[NSURL alloc] initWithString:self.imageURL]; debugLog(@"downloading image: %@", self.imageURL); //NSError *error = nil; NSData *data = [[NSData alloc] initWithContentsOfURL:url]; [url release]; UIImage *image = [[UIImage alloc] initWithData:data]; [data release]; if (image) { if (image.size.width != ICONWIDTH && image.size.height != ICONHEIGHT) { UIImage *resizedImage; CGSize itemSize = CGSizeMake(ICONWIDTH, ICONHEIGHT); UIGraphicsBeginImageContext(itemSize); CGRect imageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height); [image drawInRect:imageRect]; resizedImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); self.theImage = resizedImage; } else { self.theImage = image; } [image release]; } [delegate didFinishDownloadingImage: self]; [pool release]; } This is how i handle downloading the images. If i comment out [delegate didFinishDownloadingImage: self]; in the function above it doesn't crash but of course it is useless. -(void) didFinishDownloadingImage:(ImageDownloadOperation *) imageDownloader { [self performSelectorOnMainThread: @selector(handleDidFinishDownloadingImage:) withObject: imageDownloader waitUntilDone: FALSE]; } -(void) handleDidFinishDownloadingImage:(ImageDownloadOperation *)imageDownloadOperation { NSArray *visiblePaths = [self.myTableView indexPathsForVisibleRows]; CompanyImgDownloaderState *stateObject = (CompanyImgDownloaderState *)[imageDownloadOperation stateObject]; if ([visiblePaths containsObject: stateObject.indexPath]) { //debugLog(@"didFinishDownloadingImage %@ %@", imageDownloader.theImage); UITableViewCell *cell = [self.myTableView cellForRowAtIndexPath: stateObject.indexPath]; UIImageView *imageView = (UIImageView *)[cell viewWithTag: 1]; if (imageDownloadOperation.theImage) { imageView.image = imageDownloadOperation.theImage; stateObject.company.icon = imageDownloadOperation.theImage; } else { imageView.image = [(TestWebServiceAppDelegate *)[[UIApplication sharedApplication] delegate] getCylexIcon]; stateObject.company.icon = [(TestWebServiceAppDelegate *)[[UIApplication sharedApplication] delegate] getCylexIcon]; } } }

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• UISwitch propagate state

  - by Reonarudo

  Hello, I'm still rather new to iPhone development and I tried something I didn't it was possible. I have a UIView for my TableView Section Header with a switch on it, and I also have a UITableCellView with another Switch on it. It all looks fine, but now I want to propagate the UISwitch state from the section header to all the UISwitches on the section rows. Can anyone enlighten me how can I accomplish this? Thank you.

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• Simultaneous gesture recognizers in Iphone SDK

  - by minaevs

  I need to catch two different swipping gestures using UISwipeGestureRecognizer(for example, UISwipeGestureRecognizerDirectionRight and UISwipeGestureRecognizerDirectionLeft). When I add two different recognisers with addGestureRecognizer method, only last added recognizer works. I've read that I need to implement gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer: method of UIGestureRecognizerDelegate protocol, but nothing works. Can anyone help with simple example of catching two or more same gestures? Thanks!

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• Update table columns bound to NSArrayController

  - by Loz

  Hi, I'm fairly new to the world of bindings in cocoa, and I'm having some troubles (perhaps/probably due to a misunderstanding). I have a singleton that contains an NSMutableArray called plugins, containing objects of class Plugin. It has a method called loadPlugins which adds objects to the plugins array. This may be called at any point. It's been added as an instance in Interface Builder. Also in IB is an NSObjectController, whose content outlet is connected to the singleton. There is also an NSArrayController, whose contentArray is bound to the NSObjectController (controller key is 'selection', model key path is 'plugins', object class name is 'Plugin'). And finally I have a table view with 2 columns, the values of which are bound to the NSArrayController's arrangedObjects, using keys of properties in the Plugin class. So far so standard (as far as I can tell from tutorials at least). My trouble is that when the loadPlugins method is called in the singleton, and objects are added to the plugins array, the table doesn't update to show the objects (unless loadPlugins is called before the nib is loaded). -reloadData called on the tableView doesn't do anything. Is there a way to tell the NSArrayController that the referenced array has been updated? I understand there is the -add: method for NSArrayController, which could be used in the loadPlugins, but this isn't desirable as I want to keep the singleton totally separate from the display aspect. This seems related to: http://stackoverflow.com/questions/1623396/refresh-cocoa-binding-nsarraycontroller-combobox The line: "editing the array behind the controller's back" seems to perhaps pinpoint the problem, but I would hope that it would be possible to have the singleton not know about the controller. Thanks in advance.

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• iPhone Core Data how to update the NSManagedObjects .h & .m after making changes to the data model

  - by jamone

  I have made a data model, and now I've made a 2nd version. All of the generated NSManagedObjects mapped to that data model are all version 1. Is there some way to update them to v2 without deleting them and then saying having them generated again?

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• How to load View from NIB into another NIB?

  - by Sheehan Alam

  I have two NIB's ParentViewController.xib ChildViewController.xib ParentViewController.xib contains a UIView and a UIViewController. ChildViewController.xib contains a UIButton I want ChildViewController.xib to load in the ParentViewController.xib's UIView I have done the following: Created @property for UIView in ParentViewController Connected File's Owner to UIView in ParentViewController Set UIViewController in ParentViewController's NIB Name property to ChildViewController in Interface Builder Set ChildViewController view property to UIView in ParentViewController I was hoping this would load ChildViewController into my UIView in ParentViewController but no luck. I did get the following warning, which could be the culprit: 'View Controller (Child View)' has both its 'NIB Name' property set and its 'view' outlet connected. This configuration is not supported. I also have added additional code in ParentViewController's viewDidLoad(): - (void)viewDidLoad { [super viewDidLoad]; ChildViewController *childViewController = [[ChildViewController alloc]initWithNibName:@"ChildViewController" bundle:nil]; childViewController.view = self.myView; } Any thoughts on why ChildViewController does not load in the UIView of ParentViewController?

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• SnowLeopard Xcode warning: "format not a string literal and no format arguments"

  - by Justin Galzic

  Since upgrading to the latest XCode 3.2.1 and SnowLeopard, I've been getting the warning, "format not a string literal and no format arguments" on the following: NSError *error = nil; if (![self.managedObjectContext save:&error]) { NSLog([NSString stringWithFormat:@"%@ %@, %@", errorMsgFormat, error, [error userInfo]]); } If 'errorMsgFormat' is an NSString with format specifiers (eg: "print me like this: %@"), what is wrong with the above NSLog statement? And what is the recommended way to fix it so that the warning isn't generated?

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• Algorithm to create a linked list from a set of nodes

  - by user320587

  Hi, I am looking for an algorithm to create a linked list from a set of nodes. For example, let's assume a node is an airline ticket from a source point to destination. (e.g., Chicago to Detroit) and there are several airline tickets. Assuming all these airline tickets are jumbled, what is the best way to determine the entire journey path. If there are 5 airline tickets like Chicago-Detroit, Denver-Chicago, Detroit-DC, DC-New York, San Jose-Denver, the algorithm should be able to come up with the correct start to end path. San Jose - Denver - Chicago - Detroit - DC - New York

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• cant show MBProgressHUD

  - by dejoong

  In here said that using MBProgressHUD is easy. But i cant make it. Here my code: - (IBAction)save{ HUD = [[MBProgressHUD alloc] initWithView:self.navigationController.view]; [self.navigationController.view addSubview:HUD]; HUD.delegate = self; [HUD show:YES]; NSString *title = [page stringByEvaluatingJavaScriptFromString:@"document.title"]; SavePageAs *savePage = [[SavePageAs alloc] initWithUrl:self.site directory:title]; [savePage save]; [HUD hide:YES]; } the progress indicator not show during [savePage save] method run, but show after the page completely saved (the indicator show for less than 1 second). I also tried this way: - (IBAction)save { HUD = [[MBProgressHUD alloc] initWithView:self.navigationController.view]; [self.navigationController.view addSubview:HUD]; HUD.delegate = self; HUD.labelText = @"Saving..."; [HUD showWhileExecuting:@selector(performFetchOnMainThread) onTarget:self withObject:nil animated:YES]; } - (void) savingPage{ NSString *title = [page stringByEvaluatingJavaScriptFromString:@"document.title"]; SavePageAs *savePage = [[SavePageAs alloc] initWithUrl:self.site directory:title]; [savePage save]; } -(void) performFetchOnMainThread { [self performSelectorOnMainThread:@selector(savingPage) withObject:nil waitUntilDone:YES]; } but still no luck. Anyone let me know where im lack here?? P.S [savePage save] is saving all website contents to local directory. I wish once the saving is complete the progressHUD disappear. Thanks

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• Why the CCLayer can't use a for loop in draw method??

  - by Tattat

  I have a CClayer, that have a draw method, every second, it will call the draw method 60 times. So, I have method like this: -(void)draw{ glEnable(GL_LINE_SMOOTH); glColor4f(0.0f, 1.0f, 0.0f, 1.0f); glLineWidth(5.0f); ccDrawLine(ccp(300,20), CGPointZero); } I work great. but after I added a for looop, for example....: -(void)draw{ glEnable(GL_LINE_SMOOTH); glColor4f(0.0f, 1.0f, 0.0f, 1.0f); glLineWidth(5.0f); ccDrawLine(ccp(300,20), CGPointZero); for(int i=0; i<5; i++){ NSLog(@"Testing the loop, %i", i); } } It can't draw anything, the screen only black. But I can see the Testing the loop is keep calling.... Why? thank you.

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• Can AVAudioSession do full duplex?

  - by Eric Christensen

  It would seem like it should be able to, but the following breakout test code can't do both: //play a file: NSArray *pathsArray = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [pathsArray objectAtIndex:0]; NSString* playFilePath=[documentsDirectory stringByAppendingPathComponent:@"testplayfile.wav"]; AVAudioPlayer *tempplayer = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:playFilePath] error:nil]; [tempplayer prepareToPlay]; [tempplayer play]; //and record a file: NSString* recFilePath=[documentsDirectory stringByAppendingPathComponent:@"testrecordfile.wav"]; AVAudioRecording *soundrecording = [[AVAudioRecorder alloc] initWithURL:[NSURL fileURLWithPath:recFilePath] settings:nil error:nil]; [soundrecording prepareToRecord]; [soundrecording record]; This is the minimum I can think of to individually play one file and record another. And this works just fine in the simulator. I can play back a file and record at the same time. But it doesn't work on the iphone itself. If I comment out either function, the other performs fine. The playback plays fine either alone or with both, if it's first. If I comment out the playback, the record records fine. (There's additional code to stop the recording not shown here.) So each works fine, but not together. I know audioQueue has a setting to allow both, but I don't see an analogue for AVAudioSessions. Any idea if it's possible, and if so, what I need to add? Thanks!

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• How to resolve a NULL cString crash

  - by hanumanDev

  I'm getting a crash with the following encoding fix I'm trying to implement: // encoding fix NSString *correctStringTitle = [NSString stringWithCString:[[item objectForKey:@"main_tag"] cStringUsingEncoding:NSISOLatin1StringEncoding] encoding:NSUTF8StringEncoding]; cell.titleLabel.text = [correctStringTitle capitalizedString]; my crash log output states: *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** +[NSString stringWithCString:encoding:]: NULL cString' thanks for any help

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• How to linebreak long string constructs ?

  - by iFloh

  I am editing SQLite SQL statements of substantial length. How can I break these into several lines to allow comfortablt editing? const char *sql = "SELECT arguments arguments arguments arguments arguments arguments arguments arguments arguments arguments FROM a, b, WHERE condition condition condition condition condition condition condition" into const char *sql = "SELECT arguments arguments arguments arguments arguments arguments arguments arguments arguments arguments FROM a, b WHERE condition condition condition" cheers

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