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• Objective-C and Cocoa : crash when calling a class function without entering the function

  - by Oliver

  Hello, I have a class function (declared and implemented) in a class MyUtils : + (NSString*) theFunction:(NSString*)param1 param2:(NSString*)param2 param3:(NSString*)param3; When I call this function, with : NSString *item = [MyUtils theFunction:@"abc" param2:aPreviousNSString param3:@"xyz"; my app crashes. In the debugger I have a breakpoint on the first action of the "theFunction" function. And this breakpoint is never reached. If I replace the call by NSString *item = @"youyou"; then everything is ok. Forcing a retain on aPreviousNSString before the call does not change anything. Do you have an idea of what is happening ? Thanks

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• AdWhirl implementation in iPhone Cocoa touch

  - by user571283

  Hi dudes, i'm starting to implement AdWhirl in my application. i follow the instructions which is belong to adwhirl but i cant see any ad in my application.i add the following methods in my viewcontroller class - (void)viewDidLoad { [super viewDidLoad]; AdWhirlView *adView=[AdWhirlView requestAdWhirlViewWithDelegate:self]; [self.view addSubview:adView]; } -(NSString *) adWhirlApplicationKey{ return @"myAdWhirlKey"; } -(UIViewController *) viewControllerForPresentingModalView{ return self; } i doesn't display anything. please help how to implement AdWhirl

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• access music database from cocoa

  - by RW

  How do I access the iTunes database from my application. I seems apple can access iphone and itunes from their apps. How do I do the same?

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• When to use UIWebView vs layout cocoa components?

  - by Henry

  When to use UIWebView other than supporting Rich Text?

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• Best way to initialise / clear a string variable cocoa

  - by Spider-Paddy

  I have a routine that parses text via a loop. At the end of each record I need to clear my string variables but I read that someString = @"" actually just points to a new string & causes a memory leak. What is the best way to handle this? Should I rather use mutable string vars and use setString:@"" between iterations?

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• Adding on touch event to images inside gridview

  - by Steve

  I have a gridview where each item has a image and a textview (an app), i added the onItemClick to the gridview in order to launch the app, i also removed the orange selection and made selector in xml so when pressed the text would change to grey and on release it would return to white. My problem is that i need the image to apply an alpha value when pressed and restore the previous alpha on release i tested a lot of ways and none did worked correctly. I came close with the updated answer from the autor of the question: How to set alpha value for drawable in a StateListDrawable?, but some how the state pressed never gets called, i don´t know if this is because i am using the onitemClick to launch the app or not. Also i since i can´t define the alpha on imageview xml i don´t know what else to do Any help will be appreciated

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• Wildcard App IDs for iPhone/iPod Touch Apps

  - by Can Berk Güder

  I'm writing my third app, and I already have an app in the App Store, but I still don't get this App ID business. I created the App IDs for my first two applications like this: XXXXXXXXXX.me.cbg.FirstApp YYYYYYYYYY.me.cbg.SecondApp but then Apple introduced the App ID wizard, which I used to create the App ID and provisioning profiles for my third application: ZZZZZZZZZZ.* So my question is: What is the "proper" way of creating App IDs for three completely independent apps? Should I use the XXXXXXXXXX.* format or XXXXXXXXXX.me.cbg.*? Should I create three different App IDs, or just one wildcard ID?

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• Detect touch Cocos2d-x

  - by James Dunay

  I'm using Cocos2d-x and trying to detect touches in my HelloWorld project. Though I'm having no luck. .h class HelloWorld : public CCLayer{ private: CCSpriteBatchNode * _batchNode; CCSprite *_turkey; virtual void ccTouchesBegan(cocos2d::CCSet* touches, cocos2d::CCEvent* event); .ccp void HelloWorld::ccTouchesBegan(cocos2d::CCSet* touches, cocos2d::CCEvent* event){ CCLog("this"); } but the thing is that when I click the screen 'this' never shows up in the log. What am i missing here? thanks!

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• When is a Cocoa callback given controll?

  - by Kaspa

  Hi, I've been searching around the web for an answer to this one, but was unable to find an answer, on the other side I think it's something quite common thus there is a possibility I'm missing some keywords here. Anyhow, the problem is as follows: When is control given to a callback function in ObjC (iPhone)? Does it happen after control is given to a high up in the hierarchy class responsible for the runloop? Can it occur in the middle of another function call being executed? As an example, let's take the NSURLConnection, we don't know or can't predict when it's going to call didReceiveResponse or the other callback methods, can it be the case that didReceiveResponse get's called when I'm in the middle of another function? (highly doubt that but was unable to find information on callbacks wating for the end of the run loop) Cheers, Kaspa

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• Taking random string from text file Cocoa?

  - by gpeterson

  Having troubles finding a good way to get a string from a text file (separated by line breaks) randomly. I want to do a setStringValue:@"random string from file here"; pretty much. Thanks in advance.

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• Storing acceleration values in Objective-C/Cocoa?

  - by ASchlaep

  Hi all, I'm writing for the iPhone and I'm trying to measure the time between maximum accelerations. Imagine you've attached your iPhone to an oscillating spring. What I want to do is measure the frequency of the oscillation. The way I am going about doing this is storing a certain number acceleration values (updated 20 times per second) in an NSMutableArray and comparing the current acceleration value with previous acceleration values. How do I add each updated acceleration value to the NSMutableArray and at the same time delete values from the back of the array as I don't need them any more? Thanks in advance!

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• android touch animating object in canvas

  - by sudha

  Hello, Please tell how to get touchlistner for bitmap object witch is animating inside the canvas, i want to stop by touching it and then want to drag wherever i want in the screen. please tell me its urgent. thanks.

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• Detect touch on bitmap

  - by steve

  Greets, Does anyone how I go about detecting when a user presses on a bitmap which is inside a canvas? Thanks

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• Webinar: Speech &amp; Mobility: The "New Touch"?

  Online event to provide insight into the shift from touch to text input.

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• iPhone SDK allow touches to affect multiple views

  - by Parad0x13

  I have a main view that has has two buttons on it that control methods to display the next image and display the previous image. In this case the 'Image' is a class that inherits from UIImageView and has multiple pictures on it that you can interact with, and I call this class a 'Pane'. The pane itself handles all the user interaction itself while the main view controls the display of next and previous panes with the buttons. Here is my dilemma, because the pane fully covers the main view it wont allow for the user to tap the buttons on the main view! So once a pane pops up you cannot change it via the buttons! Is there a way to allow touches through transparent parts of a view, or if not how in the world do I achieve this?! I cannot pass touchesBegan or any of those methods from the pane to the superview because all of the button touch methods are created in the xib file. I cannot insert the pane under the control panel because then you wouldn't be able to interact with the pane. And as far as I know theres no way to pass touch events to every single pane within the paneHoldingArray that belongs to the main view I cannot add the command buttons inside of the pane because I want to be able to replace the command button's image with a thumbprint render of the next/previous pane. I've been stuck on this for a very long time, please somebody help me out with a fix action or a new way to re-engineer the code so that it will work!

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• Two-Stage Rotation Warnings

  - by Kevin Sylvestre

  I have an application that presents a modal UITabBarController. Each UIViewController contained in the UITabBarController implements should autorotate interface orientation. However, when I present the modal UITabBarController the following warnings appear in the console: Using two-stage rotation animation. To use the smoother single-stage animation, this application must remove two-stage method implementations. Using two-stage rotation animation is not supported when rotating more than one view controller or view controllers not the window delegate. Any ideas how to remove the warnings? Thanks.

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• Heavily customized split view controller in iPad app -- how?

  - by Macatomy

  I was going through some of the early screenshots of the first iPad apps and I came upon this: I'm just wondering, how is this done? Mainly, how has the detail view section of the split view been given a drop shadow and rounded corners, and for lack of better phrasing, how has it been "separated" from the master view (the default split view template has the master and detail view joined together with nothing but a vertical line separating the two)?

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• UIViewController presentModalViewController: animated: doing nothing?

  - by ryyst

  Hi, I recently started a project, using Apple's Utility Application example project. In the example project, there's an info button that shows an instance of FlipSideView. If you know the Weather.app, you know what the button acts like. I then changed the MainWindow.xib to contain a scrollview in the middle of the window and a page-control view at the bottom of the window (again, like the Weather.app). The scrollview gets filled with instances of MainView. When I then clicked the info button, the FlipSideView would show, but only in the area that was previously filled by the MainView instance – this means that the page-control view on the bottom of the page still showed when the FlipSideView instance got loaded. So, I thought that I would simply add a UIViewController for the top-most window, which is the one declared inside the AppDelegate created along side with the project. So, I created a subclass of UIViewController, put an instance of it inside MainWindow.xib and connected it's view outlet to the UIWindow declared as window inside the app delegate. I also changed the button's action, so that it know sends a message to the MainWindowController instance. The message does get sent (I checked with NSLog() statements), but the FlipSideView doesn't get shown. Here's the relevant (?) code: FlipsideViewController *controller = [[FlipsideViewController alloc] initWithNibName:@"FlipsideView" bundle:nil]; controller.delegate = self; controller.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal; [self presentModalViewController:controller animated:YES]; [controller release]; Why's this not working? I've uploaded the entire project here for you to be able to see the whole thing. Thanks for help! -- Ry

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• Rounded Rect UIButton without the border

  - by Dave DeLong

  I'm trying to draw a normal rounded rect UIButton, but without the border. Ideally I'd like to be able to change some setting on the UIButton to disable the border. My problem is that if I change the button type to "custom", I don't get the nice blue selection gradient (which I want to keep), and I have no idea how to draw it manually.

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• getting at a UIButton with the tag property IPhone

  - by dubbeat

  Hey There, I'm having a little trouble using the tag property to access a UIButton UIButton *randomButton = [[UIButton buttonWithType:UIButtonTypeRoundedRect ]retain]; randomButton.frame = CGRectMake(205, 145, 90, 22); // size and position of button [randomButton setTitle:@"Random" forState:UIControlStateNormal]; randomButton.backgroundColor = [UIColor clearColor]; randomButton.adjustsImageWhenHighlighted = YES; [randomButton addTarget:self action:@selector(getrandom:) forControlEvents:UIControlEventTouchUpInside]; randomButton.reversesTitleShadowWhenHighlighted=YES; randomButton.toggleButton [self.view addSubview:randomButton]; [randomButton release]; randomButton.tag=333; Then later on in code I try to get at the button in the following manner which gives me an error saying Incompatible Objective-C types initializing 'struct UIView *', expected 'struct UIButton *' UIButton *random = [self.view viewWithTag:333]; random.highlighted=NO;

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• How can I truncate an NSString to a set length?

  - by nevan

  I searched, but surprisingly couldn't find an answer. I have a long NSString that I want to shorten. I want the maximum length to be around 20 characters. I read somewhere that the best solution is to use substringWithRange. Is this the best way to truncate a string? NSRange stringRange = {0,20}; NSString *myString = @"This is a string, it's a very long string, it's a very long string indeed"; NSString *shortString = [myString substringWithRange:stringRange]; It seems a little delicate (crashes if the string is shorter than the maximum length). I'm also not sure if it's Unicode-safe. Is there a better way to do it? Does anyone have a nice category for this?

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• accessing video preview data with iPhone SDK 3.1.2/3

  - by Nava Carmon

  Is there a way to access raw data of iphone camera preview? I mean not the data of the picture that was shot already, but the preview, that shows before taking a shot? TIA

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• App not installed...because its resources have been modified

  - by brettr

  One user cannot install my app because they continue to receive the error: The application “myapp” was not installed on the iPhone “myPhone” because its resources have been modified I've read the error occurs because of adding files after the app is built. I have not added any files. Last week, the user could install the ad hoc without issue. Any ideas?

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• Adding a UINavigationController as a subview of UIView

  - by eagle

  I'm trying to display a UILabel on top of a UINavigationController. The problem is that when I add the UILabel as a subview of UIWindow it will not automatically rotate since it is not a subview of UIViewController (UIViewController automatically handles updating subviews during rotations). This is the hierarchy I was using: UIWindow UILabel UINavigationController So I was thinking I could use the following hierarchy: UIWindow UIViewController UIView UILabel UINavigationController This way the label could be displayed on top of the UINavigationController's bar while also automatically being rotated since it is a subview of UIViewController. The problem is that when I try adding a UINavigationController as a subview of a view: [myViewController.view addSubview:myNavigationController.view]; it will appear 20 pixels downwards. Which I'm guessing is because it thinks it needs to make room for the status bar. But, since the UINavigationController is being placed inside a UIView which does not overlay on top of the status bar, it is incorrectly adding an additional 20 pixels. In other words, the top of the UINavigationBar is at the screen's 40 pixel mark instead of at 20 pixels. Is there any easy way to just shift the UINavigationController and all of its elements (e.g. navigation bar, tool bar, root view controller) up 20 pixels? Or to let it know that it shouldn't compensate for a status bar? If not, I guess I would need to use my first hierarchy mentioned above and figure out how to rotate the label so it is consistent with the navigation bar's rotation. Where can I find more information on how to do this? Note: by "displaying a label on top of the navigation bar", I mean it should overlay on top of the navigation bar... it can't simply be wrapped in a bar button item and placed as one of the items of the navigation bar.

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• iPhone UIButton addTarget:action:forControlEvents: not working

  - by Aaron Vegh

  I see there are similar problems posted here, but none of the solutions work for me. Here goes: I have a UIButton instance inside a UIView frame, which is positioned within another UIView frame, which is positioned in the main window UIView. To wit: UIWindow --> UIView (searchView) --> UISearchBar (findField) --> UIView (prevButtonView) --> UIButton (prevButton) --> UIView (nextButtonView) --> UIButton (nextButton) So far, so good: everything is laid out as I want it. However, the buttons aren't accepting user input of any kind. I am using the UIButton method addTarget:action:forControlEvents: and to give you an idea of what I'm doing, here's my code for nextButton: nextButton = [UIButton buttonWithType:UIButtonTypeCustom]; [nextButton setImage:[UIImage imageNamed:@"find_next_on.png"] forState:UIControlStateNormal]; [nextButton setImage:[UIImage imageNamed:@"find_next_off.png"] forState:UIControlStateDisabled]; [nextButton setImage:[UIImage imageNamed:@"find_next_off.png"] forState:UIControlStateHighlighted]; [nextButton addTarget:self action:@selector(nextResult:) forControlEvents:UIControlEventTouchUpInside]; The method nextResult: never gets called, the state of the button doesn't change on touching, and there's not a damned thing I've been able to do to get it working. I assume that there's an issue with all these layers of views: maybe something is sitting on top of my button, but I'm not sure what it could be. In the interest of information overload, I found a bit of code that would print out all my view info. This is what I get for my entire view hierarchy: UIWindow {{0, 0}, {320, 480}} UILayoutContainerView {{0, 0}, {320, 480}} UINavigationTransitionView {{0, 0}, {320, 480}} UIViewControllerWrapperView {{0, 64}, {320, 416}} UIView {{0, 0}, {320, 416}} UIWebView {{0, 44}, {320, 416}} UIScroller {{0, 0}, {320, 416}} UIImageView {{0, 0}, {54, 54}} UIImageView {{0, 0}, {54, 54}} UIImageView {{0, 0}, {54, 54}} UIImageView {{0, 0}, {54, 54}} UIImageView {{-14.5, 14.5}, {30, 1}} UIImageView {{-14.5, 14.5}, {30, 1}} UIImageView {{0, 0}, {1, 30}} UIImageView {{0, 0}, {1, 30}} UIImageView {{0, 430}, {320, 30}} UIImageView {{0, 0}, {320, 30}} UIWebDocumentView {{0, 0}, {320, 21291}} UIView {{0, 0}, {320, 44}} UISearchBar {{10, 8}, {240, 30}} UISearchBarBackground {{0, 0}, {240, 30}} UISearchBarTextField {{5, -2}, {230, 31}} UITextFieldBorderView {{0, 0}, {230, 31}} UIPushButton {{205, 6}, {19, 19}} UIImageView {{10, 8}, {15, 15}} UILabel {{30, 7}, {163, 18}} UIView {{290, 15}, {23, 23}} UIButton {{0, 0}, {0, 0}} UIImageView {{-12, -12}, {23, 23}} UIView {{260, 15}, {23, 23}} UIButton {{0, 0}, {0, 0}} UIImageView {{-12, -12}, {23, 23}} UINavigationBar {{0, 20}, {320, 44}} UINavigationButton {{267, 7}, {48, 30}} UIImageView {{0, 0}, {48, 30}} UIButtonLabel {{11, 7}, {26, 15}} UINavigationItemView {{79, 8}, {180, 27}} UINavigationItemButtonView {{5, 7}, {66, 30}} MBProgressHUD {{0, 0}, {320, 480}} UIActivityIndicatorView {{141, 206}, {37, 37}} UILabel {{117, 247}, {86, 27}} The relevant part is noted above the UINavigationBar section. Anyone have any suggestions? I'm all out. Thanks for reading. Aaron.

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