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• UIImagePickerController camera preview is portrait in landscape app

  - by Jane Sales

  In my landscape-only iPhone application, I launch a UIImagePickerController to take a photo, but the live image displayed from the camera is in portrait orientation, with blank space around it. The image is rotated. Once the camera button is pressed, the preview is very messy, with most of the preview off screen, and views not correctly aligned. Apple has acknowledged that this is defect, and is working on it. My question is, does anyone have a work-around (legal or illegal) that would allow me to get this working now. I wouldn't release to the App Store with an illegal fix, but I would have a much better app for user testing - currently the camera is pretty much unusable in landscape. I will attach a simple test project and images if I can. Edit - just to clarify, the image I get is correctly landscape. I want the camera & preview UIs to look right!

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• How to prevent a globally overridden "new" operator from being linked in from external library

  - by mprudhom

  In our iPhone XCode 3.2.1 project, we're linking in 2 external static C++ libraries, libBlue.a and libGreen.a. libBlue.a globally overrides the "new" operator for it's own memory management. However, when we build our project, libGreen.a winds up using libBlue's new operator, which results in a crash (presumably because libBlue.a is making assumptions about the kinds of structures being allocated). Both libBlue.a and libGreen.a are provided by 3rd parties, so we can't change any of their source code or build options. When we remove libBlue.a from the project, libGreen.a doesn't have any issues. However, no amount of shuffling the linking order of the libraries seems to fix the problem, nor does any experimentation with the various linking flags. Is there some way to tell XCode to tell the linker to "have libGreen's use of the new operator use the standard C++ new operator rather than the one redefined by libBlue"?

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• Play a beep that loop and change the frequency/speed

  - by Bono

  Hi all, I am creating an iphone application that use audio. I want to play a beep sound that loop indefinitely. I found an easy way to do that using the upper layer AVAudioPlayer and the numberOfLoops set to "-1". It works fine. But now I want to play this audio and be able to change the rate / speed. It may works like the sound played by a car when approaching an obstacle. At the beginning the beep has a low frequency and this frequency accelerate till reaching a continuous sound biiiiiiiiiiiip ... It seems this is not feasible using the high layer AVAudioPlayer, but even looking at AudioToolBox I found no solution. Does anybody have informations about how to do that? Thanks a lot for helping me!

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• Error loading my managedObjectModel

  - by niklassaers

  Hi guys, When I call [myAppDelegate managedObjectModel], in the retain line below, my application will crash (iPhone SDK v3.1.3): - (NSManagedObjectModel *)managedObjectModel { if (managedObjectModel != nil) { return managedObjectModel; } managedObjectModel = [[NSManagedObjectModel mergedModelFromBundles:nil] retain]; return managedObjectModel; } Here is my crash trace #0 0x905c44e6 in objc_exception_throw #1 0x01e78c3b in +[NSException raise:format:arguments:] #2 0x01e78b9a in +[NSException raise:format:] #3 0x000af99b in _NSArrayRaiseInsertNilException #4 0x0001c360 in -[NSCFArray insertObject:atIndex:] #5 0x0001c274 in -[NSCFArray addObject:] #6 0x01c16a7e in +[NSManagedObjectModel mergedModelFromBundles:] #7 0x00002432 in -[myAppDelegate managedObjectModel] at myAppDelegate.m:102 What is going on here? This is template code that I haven't seen fail before. Cheers Nik

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• Core Data fetchedresultscontroller question : what is "sections" for?

  - by Jake

  Hi, I'm trying to get to know Core Data (I'm a noob at iPhone development) and in order to do this I'm trying to get an object from the fetchedresultscontroller and NSlog it's name (a property of the object). I tried to do it like this: NSArray *ar = [NSArray arrayWithArray:[fetchedResultsController sections]]; Task *t = [ar objectAtIndex:0]; NSLog(@"%@", t.taskName); However, the app crashed with this error: the app crashes with the error Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '* -[_NSDefaultSectionInfo taskName]: unrecognized selector sent to instance 0x3d1f670' I have since learned that you need to use the fetched objects property for this, but then what is sections for? Thanks for any help, sorry if this is a supremely stupid question. I've looked over the documentation but still don't understand.

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• How can get image from a path in to UITAbleViewCell ?

  - by srikanth rongali

  I have the following path in NSString *path1, /Users/srikanth/Library/Application Support/iPhone Simulator/User/Applications/9E6E8B22-C946-4442-9209-75BB0E924434/Documents/snook.jpg How can I show the image snook.jpg. I need it to show in UITableViewCell for cell.imageView.image if path1 has the path. I used the following to get the last part of the path1 , snook.jpg. NSURL *url = [NSURL URLWithString:path1]; NSString *imageString = [url path]; But, url is showing as nil. How can I do it ? Thank you.

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• CoverFlow- Flip when selected

  - by Suresh Varma

  Hello all... i am working on an application which uses the iPod like application in iPhone.. I have implemented the Coverflow. But the main problem now is when we select any image it must flip and then i have to display the detail of that image... and when clicked on detail it must flip again and the same image must get displayed... Working on this from a long but still no success.. Please help.. Thanx in advance.. Note: if the question is unclear or if u want any code regarding please ask i will post it over her..

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• Set an Interface Builder created element's state programatically

  - by mvexel

  I have a couple of UISwitch elements in a view controller that is presented modally in my iPhone app. I set up the view in IB. I want these UISwitch elements to reflect the current values in my [NSUserDefaults standardUserDefaults] where I store the appropriate BOOLs. I thought this would do the trick setting the switches to the right state, but no: -(void)viewWillAppear:(BOOL)animated { NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; [backgroundSwitch setOn:[defaults boolForKey:kTrackInBackgroundKey] animated:NO]; [batterySaveSwitch setOn:[defaults boolForKey:kBatterySaveKey] animated:NO]; } The backgroundSwitch and batterySaveSwitch are declared as properties for the view controller class. They are not initialized; that does not seem to make a difference. I did check the values coming out of the NSUserDefaults dictionary. The method is being called at the right time.

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• How do people charge friends for development projects?

  - by Crashalot

  A friend has begged our consulting firm several times to build an iPhone app. We are reluctant to jeopardize the friendship and charge market rates. At the same time, we're so busy it would be imprudent not to charge fairly. We tried referring her to other shops, but she doesn't feel comfortable with anyone but us. How do people charge friends? Since I'm asking about fees, I'm also curious to know if people charge on a fixed-price basis or hourly basis? Thanks!

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• What happens before applicationDidFinishLaunching is invoked?

  - by nefsu

  I'm doing performance testing on my iphone app and I'm noticing that sometimes a good 3-4 secs elapse at startup before I start seeing my NSLogs from applicationDidFinishLaunching. I've optimized what happens once the code enters applicationDidFinishLaunching but I'm not sure how to optimize what goes on before that. I'm using a Default.png splash screen so it basically just stalls on that screen before it enters applicationDidFinishLaunching and starts doing something. Just to give you guys some context, I have no nib files and I'm using core animation, if that makes any difference. I have about 10 different controllers and my total bundle size is just under 2MBs.

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• Single specific string replace method Objective C

  - by Sam

  Hi guys, I wanted to know if theres a single method or way that will help me replace strings for specific characters. like MALE - M FEMALE - F CHILD - P The longer way out is this.. [str stringByreplacingOccurencesOfString:@"MALE" withString:@"M"]; [str stringByreplacingOccurencesOfString:@"FEMALE" withString:@"F"]; [str stringByreplacingOccurencesOfString:@"CHILD" withString:@"P"]; I was wondering if theres another way in which i can reduce lines of code here, specially when there are alots of things to replace. thanks. this is for iPhone OS.

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• framework not found OpenGL

  - by idober

  first of all, I am very new to mac and Iphone development. I have a project, that uses the OpenGL framework. In order to try to get some other aspect of the project to work, I may have fiddled around the developer libraries (it was more then a week ago so i don't remember exactly what I did). now when I try to build the project I get "framework not found OpenGL". I have already uninstall xcode completely: sudo /Developer/Library/uninstall-devtools –mode=all and reinstalled it, but stil the same error.

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• My presentation layer does not match my model layer even though I have no animations

  - by Kevin McCullough

  On iPhone I have a CALayer that I animate via Core Animation. Then at some point I change view controllers. I then return to the view controller with the CALayer and in viewWillAppear: I set the frame and position properties on my layer to move it back to its starting point. Setting these properties changes the model layer but the presentation layer still has the old values and its presentation layer does not update until the next animation I play. In the CA Programming guide it says "You can query an instance of CALayer for its corresponding presentation layer while an animation transaction is in process." Which, to me, implies that the presentation layer should only be different from the model layer during an animation. But there are no animations currently running. I even used kCATransactionDisableActions to ensure that when I set the position property an implicit animation is not started. Does anyone know why my presentation and model layers are out of sync? Thanks.

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• Text editing best practices (with tags, etc.)

  - by Ron

  Hi there, I want to create a text field with some text, that is styled with tags. Think of MS Word, some ext is bold, some is a headline, etc. The tags that style the text are not visible to the user, he just sees the text in bold. How do I preserve these tags? I mean when I backspace over the closing bold-tag, for example, how do I preserve that and prevent that the rest of the text is now bold until the end? I guess this is a pretty basic question for experiences programmers. Are there any algorithms or best practices? This problem surely has been solved before, any pointers? (If this is of any concern, I develop for the iPhone OS and the text field will be a UITextView, but my question is more general I guess.) Thanks in advance!

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• Dealing with UIImagePickerController to minimize memory useage

  - by Gordon Fontenot

  So, I have read the SO post on UIImagePickerController, UIImage, Memory and More, and I read the post on Memory Leak Problems with UIImagePickerController in iPhone. I have VASTLY increased my memory efficiency between these 2 posts, and I thank the OPs and the people that provided the answers. I just had a question on the answer provided in the Memory Leak question, which was (essentially): only have one instance of the controller throughout the programs runtime What would be the best way to go about this without causing memory leaks? Right now I am initiating it and releasing it on every use from within the view, and I am seeing exactly what the answer describes (Memory warnings and a crash after about 20 uses). Should I initiate the UIImagePickerController when I need it, but use a seperate class unrelated to the view to control it? How should I deal with releasing the controller if I do it this way?

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• :-( A valid signing identity matching this profile could not be found in your keychain

  - by user262325

  Hello everyone I hope to test my app on iPod Touch I created development provisioning profile. I dragged downloaded .mobileprovision file to Organizer There is a yellow triangle warned that "A valid signing identity matching this profile could not be found in your keychain" The others distribution provisioning profiles have no any problem. I checked my connected iPod Touch. Organizer also said that: OS Installed on "interdev"'s iPod 3.1.3 (7E18) Xcode Supported iPhone OS Versions 3.1.1 (7C146) 3.1.1 (7C145) 3.1 (7C144) 3.0.1 (7A400) 3.0 2.2.1 2.2 2.1.1 2.1 2.0.2 (5C1) 2.0.1 (5B108) 2.0 (5A347) 2.0 (5A345) ipod os 3.1.3 xocde 3.1 Do I need to upgrade Xcode? Thanks interdev

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• Is there a way to pause a CABasicAnimation?

  - by mclaughlinj

  I have a basic spinning animation of the iPhone. Is there any way that I can "pause" the animation so that the position of the view will be maintained? I guess one way of doing this would be to cause the animation to "complete" instead of calling "remove" on it, how would I do that? CABasicAnimation* rotationAnimation; rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"]; rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 2]; rotationAnimation.duration = 100; rotationAnimation.cumulative = YES; rotationAnimation.repeatCount = HUGE_VALF; rotationAnimation.removedOnCompletion = NO; rotationAnimation.fillMode = kCAFillModeForwards; [myView.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];

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• Objectiveflickr set properties, more than one call

  - by user295944

  I cant to set Meta and set Location in ObjectiveFlickr if I do only one it works fine, but if I do both it only does the first one - (void)flickrAPIRequest:(OFFlickrAPIRequest *)inRequest didCompleteWithResponse:(NSDictionary *)inResponseDictionary { NSLog(@"%s %@ %@", PRETTY_FUNCTION, inRequest.sessionInfo, inResponseDictionary); if (inRequest.sessionInfo == kUploadImageStep) { snapPictureDescriptionLabel.text = @"Setting properties..."; NSLog(@"%@", inResponseDictionary); NSString *photoID = [[inResponseDictionary valueForKeyPath:@"photoid"] textContent]; flickrRequest.sessionInfo = kSetImagePropertiesStep; [flickrRequest callAPIMethodWithPOST:@"flickr.photos.setMeta" arguments:[NSDictionary dictionaryWithObjectsAndKeys:photoID, @"photo_id", @"Snap and Run", @"title", @"Uploaded from my iPhone/iPod Touch", @"description", nil]]; flickrRequest.sessionInfo = kSetImagePropertiesStep; [flickrRequest callAPIMethodWithPOST:@"flickr.photos.geo.setLocation" arguments:[NSDictionary dictionaryWithObjectsAndKeys:photoID, @"photo_id",@"34" ,@"lat",@"-118",@"lon", nil]]; } else if (inRequest.sessionInfo == kSetImagePropertiesStep) { [self updateUserInterface:nil]; snapPictureDescriptionLabel.text = @"Done"; [UIApplication sharedApplication].idleTimerDisabled = NO; } }

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• Process touches behind the UINavigationBar

  - by Reed Olsen

  In my application, I'm displaying a fullscreen image in a 320 x 480 frame. After I display the image, I fade the navigation bar out to allow the user to see the whole picture. When the user taps in the area where the navigation bar was, I would like to bring the navigation bar back. This is very similar to what happens in the iPhone Photos app. Unfortunately, after I've hidden the UINavigationBar, I can't process touches on the screen where the navigation bar once was. I believe this is because the origin of the parent view is right below the navigation bar: How can I process touches in this area to bring the nav bar back?

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• Opening AFOpenFlowView already in landscape mode

  - by justin

  I'm using the open source CoverFlow replacement from here: http://fajkowski.com/blog/2009/08/02/openflow-a-coverflow-api-replacement-for-the-iphone/ When I detect that a certain view has gone from portrait to landscape mode, I instantiate an AFCoverFlowView and push it onto the navigation stack. If I do so in response to (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation The cover flow view comes up as though the phone were still in portrait mode. If I push the view in response to (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation it works perfectly - the view comes up in landscape mode with the phone in landscape mode Unfortunately, the device doesn't reliable get willRotateToInterfaceOrientation messages. I have tried making sure that [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications]; is in loadView but that doesn't help with the notificiations. So, my questions are: Is there a way to reliably get willRotateToInterfactOrientation? if not How do I instruct AFCoverFlowView to come up in landscape mode (if the device is already in landscape mode)

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• UIAlertView with subview animating to new view crashes app

  - by William

  UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Congratulations" message:message delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"View", nil]; UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(110, 100, 80, 80)]; NSString *imagePath = [NSString stringWithFormat:@"%@", [Array objectAtIndex:x]]; UIImage *bkgImg = [UIImage imageWithContentsOfFile: [[NSBundle mainBundle] pathForResource:imagePath ofType:@"png"]]; imageView.image = bkgImg; [bkgImg release]; [alert addSubview:imageView]; [imageView release]; [alert show]; [alert release]; That is the code that I am using to create the alert view. Currently, I have it set up so if the user presses one of the buttons, it will load up a new viewcontroller. It worked fine until I added a subview to the UIAlertView. Now, whenever it animates to the new screen, it just crashes the program. I am fairly new to iPhone development and any help would be appreciated.

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• Change NSButton Background Image more than once per second

  - by beta

  I am currently working with the iPhone SDK. I have a NSTimer that changes the background image of a NSButton. Once this is complete, it will trigger the same action again (reset the NSTimer) for a predetermined number of times. My problem is that if my NSTimer is set to execute more than once per second. (0.75, say) The background image wont change. I am using NSLog to check that the event fires. But the button image will just remain in its original state. Is there any way to change the background image more often than once per second? Thanks.

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• If the UIApplicationMain() never returns then when does the autorelease pool gets released?

  - by sid

  For code: int main(int argc, char *argv[]) { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; int retVal = UIApplicationMain(argc, argv, nil, nil); [pool release]; return retVal; } Apple's doc clearly specifies: Return Value: Even though an integer return type is specified, this function never returns. When users terminate an iPhone application by pressing the Home button, the application immediately exits by calling the exit system function with an argument of zero. Secondly, in int UIApplicationMain ( int argc, char *argv[], NSString *principalClassName, NSString *delegateClassName ); how can we access the argv from our UIApplication subclass?

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• Address Book callback not called

  - by Oliver

  I have an iPhone app that makes use of the AddressBook.framework and uses Core Data to store these contacts. In order to make sure I update my own database when the Address Book is updated (whether via MobileMe or editing within my own app), I am subscribing to the notification as to when the Address Book is updating. I call this on startup: ABAddressBookRef book = ABAddressBookCreate(); ABAddressBookRegisterExternalChangeCallback(book, addressBookChanged, self); Which (supposedly) calls this on any editing. I have an ABPersonViewController which allows editing, and addressBookChanged never seems to get called. void addressBookChanged(ABAddressBookRef reference, CFDictionaryRef dictionary, void *context) { // The contacts controller we need to call ContactsController *contacts = (ContactsController *)context; // Sync with the Address Book [contacts synchronizeWithAddressBook:reference]; } Is there any reason for it to not be called?

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• how to create a rounded transparent rectangle by using cocoa touch ?

  - by srikanth rongali

  Hi, I need to create a rounded rectangular box in which there will be 6 buttons in iPhone application. And the rectangular box is transparent. Each button have an image and text. And they are also transparent. ( Here transparent means we can see the background image of the box. Sorry for my vocabulary.) I could not get how to start it. I thought of the following one but, By using core graphics draw the outside rounded rectangle and then draw inside rectangles like 2x3 grid. Can I make with this ? Are there any good and easy methods than this. Please give me some idea how to start over with ? Thank you.

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