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  • CCSprite following a sequence of CGPoints

    - by pgb
    I'm developing a line drawing game, similar to Flight Control, Harbor Master, and others in the appstore, using Cocos2D. For this game, I need a CCSprite to follow a line that the user has drawn. I'm storing a sequence of CGPoint structs in an NSArray, based on the points I get in the touchesBegin and touchesMoved messages. I now have the problem of how to make my sprite follow them. I have a tick method, that is called at the framerate speed. In that tick method, based on the speed and current position of the sprite, I need to calculate its next position. Is there any standard way to achieve this? My current approach is calculate the line between the last "reference point" and the next one, and calculate the next point in that line. The problem I have is when the sprite "turns" (moves from one segment of the line to another). Any hint will be greatly appreciated.

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  • Drawing a PDF Right-Side-Up in CGContext

    - by Carter Allen
    I'm overriding the drawRect: method in a custom UIView, and I'm doing some custom drawing. All was going well, until I needed to draw a PDF resource (a vector glyph, to be precise) into the context. First I retrieve the PDF from a file: NSURL *pdfURL = [NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"CardKit.bundle/A.pdf"]]; CGPDFDocumentRef pdfDoc = CGPDFDocumentCreateWithURL((CFURLRef)pdfURL); CGPDFPageRef pdfPage = CGPDFDocumentGetPage(pdfDoc, 1); Then I create a box with the same dimensions as the loaded PDF: CGRect box = CGPDFPageGetBoxRect(pdfPage, kCGPDFArtBox); Then I save my graphics state, so that I don't screw anything up: CGContextSaveGState(context); And then I perform a scale+translate of the CTM, theoretically flipping the whole context: CGContextScaleCTM(context, 1.0, -1.0); CGContextTranslateCTM(context, 0.0, rect.size.height); I then scale the PDF so that it fits into the view properly: CGContextScaleCTM(context, rect.size.width/box.size.width, rect.size.height/box.size.height); And finally, I draw the PDF and restore the graphics state: CGContextDrawPDFPage(context, pdfPage); CGContextRestoreGState(context); The issue is that there is nothing visible drawn. All this code should theoretically draw the PDF glyph into the view, right? If I remove the scale+translate used to flip the context, it draws perfectly: it just draws upside-down. Any ideas?

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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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  • In Objective C, what's the best way to extract multiple substrings of text around multiple patterns?

    - by Matt
    For one NSString, I have N pattern strings. I'd like to extract substrings "around" the pattern matches. So, if i have "the quick brown fox jumped over the lazy dog" and my patterns are "brown" and "lazy" i would like to get "quick brown fox" and "the lazy dog." However, the substrings don't necessarily need to be delimited by whitespace. I have a hunch that there's a very easy solution to this, but I admit a disturbing lack of knowledge of Objective C string functions.

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  • addSubview like modal

    - by brettr
    How can I get a UIView to transition via addSubview like the presentModalViewController does? The available animations don't seem to do this. I would use the modal but I have a navigation bar at the top and don't want to disable it. Also, the modal overlays on the navigation bar. If there is a way to have it so the modal doesn't disable the nav bar, I can go with that approach. But since it is a modal, I don't think that is possible.

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  • Schedule timer with NSTimer makes the task run faster than expected

    - by Hoang Pham
    I schedule a timer with NSTimer's function in viewWillAppear as follows: minutesTimer = nil; minutesTimer = [NSTimer scheduledTimerWithTimeInterval:60 target:self selector:@selector(updateScrollViewItems) userInfo:NULL repeats:YES]; With this function call, I expect it to call the selector updateScrollViewItems every minute, but it does not, it update items faster than expected (around some seconds). What is the cause of this unexpected behavior?

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  • Increase frequency calls of touchesMoved

    - by Erika
    Hi Everyone, Is there a way to increase the frequency calls of touchesMoved than the default? I need more calls of it to draw a smooth circle. It gets called not too frequent by default and so I get an edgy circle. Is there a way to tweek the frequency of touchesMoved calls? Thanks

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  • Interface Builder can't see classes in a static library

    - by teabot
    I have refactored some UIView sub-classes into a static library. However, when using Interface Builder to create view components for a project that uses the static library I find that it is unaware of the library classes. What do I need to do to make the class interfaces visible to Interface Builder? Update: The correct answer refers to dragging the headers into the 'XIB browser'. The '.h' files can be dragged from a finder window to the window area identified in this image:

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  • Share background view between tabs on a UITabBarController

    - by MikeQ
    Is it possible to have the same background between tabs on a UITabBarController without having to set the same background on all the views? I want to put a view in the background that periodically does a very short, non-resource intensive animation. When switching tabs, I'd like that animation to persist. I've read how to do it for UINavigationControllers, but haven't found any tips for a UITabBarController.

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  • UIView shadow drawing wrong

    - by dc
    Trying to draw a shadow using code from this question: http://stackoverflow.com/questions/805872/how-do-i-draw-a-shadow-under-a-uiview I implement it in a UIView subclass as discussed, but when I try and use it using UIView *shadow = [[ShadowView alloc]initWithFrame:CGRectMake(100,100,100,100)]; I get only a black square, rather than something resembling shadow. Am I missing something here?

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  • UINavigationController creating a blank view out of thin air?

    - by Alex Gosselin
    Ok, this one is really weird... I can't show code for it exactly cause it follows a pretty snake-like pattern through subclasses etc, there would be a pile of it. The important parts are that I push a view controller, which during viewWillAppear pushes another view controller onto the nav controller. My nav controller is an item in a tab bar. When I press back twice, I wind up at a blank view with the same title as my root view controller, (I have no other views having this title). I even tested and put a NSLog() in viewWillAppear to make sure it was the same view appearing, but for some reason the mystery blank view is showing up instead of my view. I am able to get the original view back by pressing the button on the tab bar again. (The one that corresponds to the nav controller). This confuses me greatly, so any help would be appreciated. I will post code if somebody could narrow down what code to put. Thanks.

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  • iPhone: Changing CGImageAlphaInfo of CGImage

    - by TechZen
    I have a PNG image that has an unsupported bitmap graphics context pixel format. Whenever I attempt to resize the image, CGBitmapContextCreate() chokes on the unsupported format (Error formatted for easy reading): CGBitmapContextCreate: unsupported parameter combination: 8 integer bits/component; 32 bits/pixel; 3-component colorspace; kCGImageAlphaLast; 1344 bytes/row. The list of supported pixel formats definitely does not support this combination. It appears I need to redraw the image and move the alpha channel information to kCGImageAlphaPremultipliedFirst or kCGImageAlphaPremultipliedLast. I have no idea how to go about doing this. There is nothing unusual about the PNG file and it isn't corrupted. It works in all other context just fine. I encountered this error just by chance but obviously my users might have similarly formatted files so I will have to check my app's imported images and correct for this problem.

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  • best-practices for displaying new view controllers ( iPhone )

    - by Tristan
    I need to display a couple of view controllers (eg, login screen, registration screen etc). What's the best way to bring each screen up? Currently for each screen that I'd like to display, I call a different method in the app delegate like this: Code: - (void) registerScreen { RegistrationViewController *reg = [[RegistrationViewController alloc] initWithNibName:@"RegistrationViewController" bundle:nil]; [window addSubview:reg.view]; } - (void) LoginScreen { LoginViewController *log = [[LoginViewController alloc] initWithNibName:@"LoginViewController" bundle:nil]; [window addSubview:log.view]; } It works, but I cant imagine it being the best way.

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  • UITableView crashes when trying to scroll

    - by Ondrej
    Hi, I have a problem with data in UITableView. I have UIViewController, that contains UITableView outlet and few more things I am using and ... It works :) ... it works lovely, but ... I've created an RSS reader class that is using delegates to deploy the data to the table ... and once again, If I'll just create dummy data in the main controller everything works! problem is with this line: rss.delegate = self; Preview looks a little bit broken than here are those RSS reader files on Google code: (Link to the header file on GoogleCode) (Link to the implementation file on Google code) viewDidLoad function of my controller: IGDataRss20 *rss = [[[IGDataRss20 alloc] init] autorelease]; rss.delegate = self; [rss initWithContentsOfUrl:@"http://rss.cnn.com/rss/cnn_topstories.rss"]; and my delegate methods: - (void)parsingEnded:(NSArray *)result { super.data = [[NSMutableArray alloc] initWithArray:result]; NSLog(@"My Items: %d", [super.data count]); [super.table reloadData]; NSLog(@"Parsing ended"); } (void)parsingError:(NSString *)message { NSLog(@"MyMessage: %@", message); } (void)parsingStarted:(NSXMLParser *)parser { NSLog(@"Parsing started"); } Just to clarify, NSLog(@"Parsing ended"); is being executed and I have 10 items in the array. Ok, here's my RSS reader header file: @class IGDataRss20; @protocol IGDataRss20Delegate @optional (void)parsingStarted:(NSXMLParser *)parser; (void)parsingError:(NSString *)message; (void)parsingEnded:(NSArray *)result; @end @interface IGDataRss20 : NSObject { NSXMLParser *rssParser; NSMutableArray *data; NSMutableDictionary *currentItem; NSString *currentElement; id <IGDataRss20Delegate> delegate; } @property (nonatomic, retain) NSMutableArray *data; @property (nonatomic, assign) id delegate; (void)initWithContentsOfUrl:(NSString *)rssUrl; (void)initWithContentsOfData:(NSData *)inputData; @end And this RSS reader implementation file: #import "IGDataRss20.h" @implementation IGDataRss20 @synthesize data, delegate; (void)initWithContentsOfUrl:(NSString *)rssUrl { self.data = [[NSMutableArray alloc] init]; NSURL *xmlURL = [NSURL URLWithString:rssUrl]; rssParser = [[NSXMLParser alloc] initWithContentsOfURL:xmlURL]; [rssParser setDelegate:self]; [rssParser setShouldProcessNamespaces:NO]; [rssParser setShouldReportNamespacePrefixes:NO]; [rssParser setShouldResolveExternalEntities:NO]; [rssParser parse]; } (void)initWithContentsOfData:(NSData *)inputData { self.data = [[NSMutableArray alloc] init]; rssParser = [[NSXMLParser alloc] initWithData:inputData]; [rssParser setDelegate:self]; [rssParser setShouldProcessNamespaces:NO]; [rssParser setShouldReportNamespacePrefixes:NO]; [rssParser setShouldResolveExternalEntities:NO]; [rssParser parse]; } (void)parserDidStartDocument:(NSXMLParser *)parser { [[self delegate] parsingStarted:parser]; } (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError { NSString * errorString = [NSString stringWithFormat:@"Unable to parse RSS feed (Error code %i )", [parseError code]]; NSLog(@"Error parsing XML: %@", errorString); if ([parseError code] == 31) NSLog(@"Error code 31 is usually caused by encoding problem."); [[self delegate] parsingError:errorString]; } (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict { currentElement = [elementName copy]; if ([elementName isEqualToString:@"item"]) currentItem = [[NSMutableDictionary alloc] init]; } (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName { if ([elementName isEqualToString:@"item"]) { [data addObject:(NSDictionary *)[currentItem copy]]; } } (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string { if (![currentItem objectForKey:currentElement]) [currentItem setObject:[[[NSMutableString alloc] init] autorelease] forKey:currentElement]; [[currentItem objectForKey:currentElement] appendString:string]; } (void)parserDidEndDocument:(NSXMLParser *)parser { //NSLog(@"RSS array has %d items: %@", [data count], data); [[self delegate] parsingEnded:(NSArray *)self.data]; } (void)dealloc { [data, delegate release]; [super dealloc]; } @end Hope someone will be able to help me as I am becoming to be quite desperate, and I thought I am not already such a greenhorn :) Thanks, Ondrej

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  • iPhone MailComposer class UIViewController dismissModalViewControllerAnimated issues

    - by Scott Pendleton
    I created a class to launch the MailComposer so that my iPhone app would only have one place to go when generating various kinds of e-mail: some with attachments, some not. Some with pre-filled addresses, some not. I didn't want my class implement UIViewController, but it has to so it can be the delegate for the MailComposer. Otherwise, the view controllers that call my class would themselves have to be delegates for the MailComposer, which defeats the purpose. The downside of having my class be a view controller is that it has to load to the screen before it can modally bring up the MailComposer. Unfortunately, view controllers can't be transparent. The effect is, whatever is on screen gets covered by a solid white view controller for a moment before the MailComposer appears. I could maybe live with that, but not this: after the MailComposer goes away, I'm left with my blank view controller occupying the screen. I ought to be able to get rid of it from within itself by calling this: [self.parentViewController dismissModalViewControllerAnimated:NO]; But that dies a horrible death: "Loading 43365 stack frames..." Has my class -- a UIViewController that pre-fills and then launches a MailComposer -- lost track of its parentViewController? It isn't nil, because I've tested for that. As launched from within the current view controller... // My class is called Email. Email *oEmail = [[[Email alloc] init] retain]; // Red, to remind myself that I'd like to someday learn to make it transparent. oEmail.view.backgroundColor = [UIColor redColor]; // Pre-fill whatever fields you want, and specify attachments. oEmail.EmailSubject = @"I am truly stumped"; // This has to go on screen first. [self presentModalViewController:oEmail animated:NO]; // Then this can happen, which brings up the MailComposer. [oEmail f_SendEmail]; // Commenting out the next line didn't help, so I turned it back on. [oEmail release]; Inside the class, you need the mailComposeController:didFinishWithResult:error: method to make the MailComposer go away, and for that to happen, the class has to be the MFMailComposeViewControllerDelegate. Here's what happens in there: // This gets rid of the mail composer. [self dismissModalViewControllerAnimated:YES]; // This never fails to get rid of other modal view controllers when called // from within those controllers, but boy does it not work here. [self.parentViewController dismissModalViewControllerAnimated:NO]; If you can help me, I will be truly thankful!

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  • Example: Objective C method alongside a php method

    - by Nic Hubbard
    I am very used to javascript and php programing, and I just jumped into programing Objective C. After working with it for a few weeks, the methods still confused me, as to how it is passing params, and how the methods are named. Since I am used to php, I am used to seeing: function myFunc($param1, $param2, $param3, $param4) { return FALSE; } Could someone show me how this would be written in Objective C, so that I can get used to writing methods that have parameters?

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  • Memory leak using NSMutableArray in RootViewController called from App Delegate

    - by Lauren Quantrell
    I've written code to restore the state of my app, but there's a memory leak in the NSMutableArray. I'm new to Xcode so I apologize if this is something trivial I have overlooked. Any help is appreciated. lq AppDelegate.m - (void)applicationDidFinishLaunching:(UIApplication *)application { [rootViewController restoreState]; } RootViewController.h @interface rootViewController : UIViewController { NSMutableArray *offendingNSMutableArray; } @property (nonatomic, retain) NSMutableArray *offendingNSMutableArray; RootViewController.m @synthesize offendingNSMutableArray; - (void)restoreState { // Gets an array stored in the user defaults plist NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults]; self.offendingNSMutableArray = [[NSMutableArray alloc] initWithArray:[userDefaults objectForKey:kArrayValue]]; } - (void)viewDidUnload { self.offendingNSMutableArray = nil; } - (void)dealloc { [offendingNSMutableArray release]; }

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  • uitableview delegate methods are not called

    - by Sean
    hi all i got the problem that the tableview methods are not called the first time the tableview is shown. if switch back to the previous view and then click the button to show the tableview again, the methods are called this time. i've to say that i show an actionsheet while the tableview is loading. the actionsheet i call in the ViewWillAppear method. thanks in advance sean

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  • Is that possible using "setAutoresizingMask" to make the view autoresizing after hiding/showing navi

    - by Mickey Shine
    I am doing this with the following: [[self navigationController] setNavigationBarHidden:YES animated:YES]; and also I didn't use IB to create view objects. But my view did not auto-resize after hiding navigation bar(there was a blank area where the navigation bar used to be) I am wondering if I could make it auto-resize only by "setAutoresizingMask", or do I have to use some hand-writing animation stuff?

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  • How to I pass @selector as a parameter?

    - by erotsppa
    For the method [NSThread detachNewThreadSelector:@selector(method:) toTarget:self withObject:(id)SELECTOR]; How do I pass in a @selector? I tried casting it to (id) to make it compile but it crashes in runtime. More specifically, I have a method like this +(void)method1:(SEL)selector{ [NSThread detachNewThreadSelector:@selector(method2:) toTarget:self withObject:selector]; } it crashes, how do I pass in the selector without crashing? So that the new thread can call the selector when the thread is ready?

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  • CATiledLayer blanking tiles before drawing contents

    - by Greg Plesur
    All, I'm having trouble getting behavior that I want from CATiledLayer. Is there a way that I can trigger the tiles to redraw without having the side-effect that their areas are cleared to white first? I've already subclassed CATiledLayer to set fadeDuration to return 0. To be more specific, here are the details of what I'm seeing and what I'm trying to achieve: I have a UIScrollView with a big content size...~12000x800. Its content view is a UIView backed by a CATiledLayer. The UIView is rendered with a lot of custom-drawn lines Everything works fine, but the contents of the UIView sometimes change. When that happens, I'd like to redraw the tiles as seamlessly as possible. When I use setNeedsDisplay on the view, the tiles redraw but they are first cleared to white and there's a fraction-of-a-second delay before the new content is drawn. I've already subclassed CATiledLayer so that fadeDuration is set to 0. The behavior that I want seems like it should be possible...when you zoom in on the scrollview and the content gets redrawn at a higher resolution, there's no blanking before the redraw; the new content is drawn right on top of the old one. That's what I'm looking for. Thanks; I appreciate your ideas. Update: Just to follow up - I realized that the tiles weren't being cleared to white before the redraw, they're being taken out entirely; the white that I was seeing is the color of the view that's beneath my CATiledLayer-backed view. As a quick hack/fix, I put a UIImageView beneath the UIScrollView, and before triggering a redraw of the CATiledLayer-backed view I render its visible section into the UIImageView and let it show. This smooths out the redraw significantly. If anyone has a better solution, like keeping the redraw-targeted tiles from going away before being redrawn in the first place, I'd still love to hear it.

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  • Memory leak with NSData

    - by Kamchatka
    I'm having a leak with this code without being able to find where it's coming from. This function get called within an autorelease pool. I release the IplImage* image argument. When I run the ObjAlloc tool, it tells me that "NSData* data" is leaking. If I try to manually release the UIImage returned by this function, I get an EXC_BAD_ACCESS error, probably because this UIImage is autoreleased. I'm a bit confused, any hint would be appreciated. Thanks! UIImage *UIImageFromIplImage(IplImage *image) { NSLog(@"IplImage (%d, %d) %d bits by %d channels, %d bytes/row %s", image->width, image->height, image->depth, image->nChannels, image->widthStep, image->channelSeq); CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); NSData *data = [NSData dataWithBytes:image->imageData length:image->imageSize]; CGDataProviderRef provider = CGDataProviderCreateWithCFData((CFDataRef)data); CGImageRef imageRef = CGImageCreate(image->width, image->height, image->depth, image->depth * image->nChannels, image->widthStep, colorSpace, kCGImageAlphaNone|kCGBitmapByteOrderDefault, provider, NULL, false, kCGRenderingIntentDefault); UIImage *ret = [UIImage imageWithCGImage:imageRef]; CGImageRelease(imageRef); CGDataProviderRelease(provider); CGColorSpaceRelease(colorSpace); return ret; }

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