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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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  • 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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  • 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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  • 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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  • 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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  • Parsing nested JSON objects with JSON Framework for Objective-C

    - by Sheehan Alam
    I have the following JSON object: { "response": { "status": 200 }, "messages": [ { "message": { "user": "value" "pass": "value", "url": "value" } ] } } I am using JSON-Framework (also tried JSON Touch) to parse through this and create a dictionary. I want to access the "message" block and pull out the "user", "pass" and "url" values. In Obj-C I have the following code: // Create new SBJSON parser object SBJSON *parser = [[SBJSON alloc] init]; // Prepare URL request to download statuses from Twitter NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:myURL]]; // Perform request and get JSON back as a NSData object NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; // Get JSON as a NSString from NSData response NSString *json_string = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding]; //Print contents of json-string NSArray *statuses = [parser objectWithString:json_string error:nil]; NSLog(@"Array Contents: %@", [statuses valueForKey:@"messages"]); NSLog(@"Array Count: %d", [statuses count]); NSDictionary *results = [json_string JSONValue]; NSArray *tweets = [[results objectForKey:@"messages"] objectForKey:@"message"]; for (NSDictionary *tweet in tweets) { NSString *url = [tweet objectForKey:@"url"]; NSLog(@"url is: %@",url); } I can pull out "messages" and see all of the "message" blocks, but I am unable to parse deeper and pull out the "user", "pass", and "url".

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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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  • 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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  • Select videos using UIImagePickerController in 2G/3G

    - by Raj
    Hi, I am facing a problem where-in I cannot select videos from the photo album in iPhone 2G/3G device. The default photos application does show videos and is capable of playing them, which in turn means that UIImagePickerController should clearly be capable of showing videos in photo album and selecting them. I have coded this to determine whether the device is capable of snapping a photo, recording video, selecting photos and selecting videos: // Check if camera and video recording are available: [self setCameraAvailable:NO]; [self setVideoRecordingAvailable:NO]; [self setPhotoSelectionAvailable:NO]; [self setVideoSelectionAvailable:NO]; // For live mode: NSArray *availableTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera]; NSLog(@"Available types for source as camera = %@", availableTypes); if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) { if ([availableTypes containsObject:(NSString*)kUTTypeMovie]) [self setVideoRecordingAvailable:YES]; if ([availableTypes containsObject:(NSString*)kUTTypeImage]) [self setCameraAvailable:YES]; } // For photo library mode: availableTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypePhotoLibrary]; NSLog(@"Available types for source as photo library = %@", availableTypes); if ([availableTypes containsObject:(NSString*)kUTTypeImage]) [self setPhotoSelectionAvailable:YES]; if ([availableTypes containsObject:(NSString*)kUTTypeMovie]) [self setVideoSelectionAvailable:YES]; The resulting logs for 3G device is as follows: 2010-05-03 19:09:09.623 xyz [348:207] Available types for source as camera = ( "public.image" ) 2010-05-03 19:09:09.643 xyz [348:207] Available types for source as photo library = ( "public.image" ) As the logs state, for photo library the string equivalent of kUTTypeMovie is not available and hence the UIImagePickerController does not show up (or rather throws exception if we set the source types array which includes kUTTypeMovie) the movie files in photo library. I havent tested for 3GS, but I am sure that this problem does not exist in it with reference to other threads. I have built the app for both 3.0 (base SDK) and 3.1 but with the same results. This issue is already discussed in the thread: http://www.iphonedevsdk.com/forum/iphone-sdk-development/36197-uiimagepickercontroller-does-not-show-movies-albums.html But it does not seem to host a solution. Any solutions to this problem? Thanks and Regards, Raj Pawan

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  • iOS: AVQueuePlayer/AVPlayerItem 'An AVPlayerItem can occupy only one position in a player's queue at a time.'

    - by JoshDG
    I keep getting this error: 'An AVPlayerItem can occupy only one position in a player's queue at a time.' I NSLog'd the players items, and none of them seem to be equal. Further, I added this just to be sure: if([player canInsertItem:itemToAdd afterItem:nil]) [player insertItem:itemToAdd afterItem:nil]; When I wasn't sure if that would work (can have two identical items in different memory locations) I wrote a category method to test if a player contains an item or something identical to it. Yet, I'm still getting the error. I've seen several posts of people getting this error with MPMoviePlayerController, but I'm not using that custom class, just the out of the box AVQueuePlayer. Any ideas on how to fix this?

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  • Custom UIToolBar from Images

    - by Sophtware
    I need to create a UIToolbar object that uses an image for the background. Most of the buttons are images as well, and rectangular. One button, however, is round and overlaps the toolbar like the Start button on the Windows task bar. See below. I know that I will need to subclass the UIToolbar to paint the image for the toolbar -- I think. If so, does anyone have example code showing how to do this? Furthermore, does anyone have any ideas on how to implement the larger round button? I'm thinking of another custom subclass for this, but not sure if there might be an easier way. I can have the art guys chop the image anyway needed, which I'm sure the round button will need to be chopped some how. Any ideas or sample code?

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  • Error Building Project With NSXMLParserDelegate.

    - by fuzzygoat
    TurbineXMLParser.h #import <Foundation/Foundation.h> @interface TurbineXMLParser : NSObject <NSXMLParserDelegate> { ... TurbineXMLParser.m #import "TurbineXMLParser.h" I have just added a new class to my current project that I previously tested in a single file. When I try and build the project I get the error: error: cannot find protocol declaration for 'NSXMLParserDelegate' I did a bit of searching and tried adding the following ... TurbineXMLParser.h #import <Foundation/Foundation.h> @protocol NSXMLParserDelegate; @interface TurbineXMLParser : NSObject <NSXMLParserDelegate> { ... but still get the warning: warning: no definition of protocol 'NSXMLParserDelegate' is found any help would be much appreciated gary

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  • PDF rendering crashes app Core Graphics

    - by Felixyz
    EDIT: The memory leaks turned out to be unrelated to the crashes. Leaks are fixed but crashes remain, still mysterious. My (iPhone) app does lots of PDF loading and rendering, some of it threaded. Sometime, it seems always after I flush a page cash after getting a memory warning, the app crashes with a bad access when trying to draw a pdf page stored in an NSData object. Here is one example trace: #0 0x3016d564 in CGPDFResourcesGetResource () #1 0x3016d58a in CGPDFResourcesGetResource () #2 0x3016d94e in CGPDFResourcesGetExtGState () #3 0x3015fac4 in CGPDFContentStreamGetExtGState () #4 0x301629a8 in op_gs () #5 0x3016df12 in handle_xname () #6 0x3016dd9e in read_objects () #7 0x3016de6c in CGPDFScannerScan () #8 0x30161e34 in CGPDFDrawingContextDraw () #9 0x3016a9dc in CGContextDrawPDFPage () But sometimes I get this instead: Program received signal: “EXC_BAD_ACCESS”. (gdb) bt #0 0x335625fa in objc_msgSend () #1 0x32c04eba in CFDictionaryGetValue () #2 0x3016d500 in get_value () #3 0x3016d5d6 in CGPDFResourcesGetFont () #4 0x3015fbb4 in CGPDFContentStreamGetFont () #5 0x30163480 in op_Tf () #6 0x3016df12 in handle_xname () #7 0x3016dd9e in read_objects () #8 0x3016de6c in CGPDFScannerScan () #9 0x30161e34 in CGPDFDrawingContextDraw () #10 0x3016a9dc in CGContextDrawPDFPage () Is this an indication that I've mistakenly deallocated an object? It's hard for me to decode what's happening here. This is how I create and retain the various objects involved: // Some data was just loaded from the network and is pointed to by "data" self.pdfData = data; _dataProviderRef = CGDataProviderCreateWithData( NULL, [_pdfData bytes], [_pdfData length], NULL ); _documentRef = CGPDFDocumentCreateWithProvider(_dataProviderRef); _pageRef = CGPDFDocumentGetPage(_documentRef, 1); CGPDFPageRetain(_pageRef); _pdfFrame = CGPDFPageGetBoxRect(_pageRef, kCGPDFArtBox); So the NSData object is retained, and I explicitly retain the page reference. The data provider and the document are already retained by the create-functions. And here is my dealloc method: -(void)dealloc { if (_pageRef) CGPDFPageRelease(_pageRef); if (_documentRef) CGPDFDocumentRelease(_documentRef); if (_dataProviderRef) CGDataProviderRelease(_dataProviderRef); self.pdfData = nil; [super dealloc]; } Am I doing anything wrong? Even an assurance that I'm not, with explanation, would be a help.

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