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  • How to set probability for a targetSprite shooting accuracy in shooting game ?

    - by srikanth rongali
    Hi, My code is ion cocos2D. I have written code for generating the bullets from the enemy gun for every 0.3seconds. The enemySprite is in right side of the screen in (land scape mode) at winSize.height/2. the bullet starts from the same point and reach the player's end. I used rand() to generate y-coordinate for the bullet to hit on player side. Now, if the bullet bounded rectangle meets the player bounded rectangle the enemy won. If it misses enemy shoots again after 0.3 seconds. Every thing is fine up to here for me. But I have 10 enemies and each have accuracy of hitting player of probabilities ranging from 0.80 to 1.0. First enemy probability is .80 and 10 enemy's is 1.0. How can I adjust the probability for enemy such that it runs according to its probability. Player also hits the enemy.

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  • Clearing "may not respond" warnings for UIView and UIViewController

    - by user284681
    In an iPad app, I'm using a custom subclass of UIView with UIViewController. Here's the view header: @interface pdfView : UIView { CGPDFDocumentRef doc; } -(void)setDoc:(CGPDFDocumentRef)newDoc; @end And here's the controller header: @interface iPadPDFTestViewController : UIViewController { CGPDFDocumentRef doc; } - (void)loadPDF; @end Part of the controller implementation: - (void)viewDidLoad { [super viewDidLoad]; [self loadPDF]; [self.view setDoc:doc]; } In Interface Builder, I've set the view object to use the class pdfView. At compilation, [self.view setDoc:doc]; gives the warning "'UIView' may not respond to '--setDoc'." I'm guessing that this warning appears because the compiler thinks it's looking at UIView (which does not implement the setDoc method) instead of pdfView. But why does it think that? And how can I tell it what class it's really looking at, so as to clear the warning?

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  • Asynchronous vs Synchronous vs Threading in an iPhone App

    - by Coocoo4Cocoa
    I'm in the design stage for an app which will utilize a REST web service and sort of have a dilemma in as far as using asynchronous vs synchronous vs threading. Here's the scenario. Say you have three options to drill down into, each one having its own REST-based resource. I can either lazily load each one with a synchronous request, but that'll block the UI and prevent the user from hitting a back navigation button while data is retrieved. This case applies almost anywhere except for when your application requires a login screen. I can't see any reason to use synchronous HTTP requests vs asynchronous because of that reason alone. The only time it makes sense is to have a worker thread make your synchronous request, and notify the main thread when the request is done. This will prevent the block. The question then is bench marking your code and seeing which has more overhead, a threaded synchronous request or an asynchronous request. The problem with asynchronous requests is you need to either setup a smart notification or delegate system as you can have multiple requests for multiple resources happening at any given time. The other problem with them is if I have a class, say a singleton which is handling all of my data, I can't use asynchronous requests in a getter method. Meaning the following won't go: - (NSArray *)users { if(users == nil) users = do_async_request // NO GOOD return users; } whereas the following: - (NSArray *)users { if(users == nil) users == do_sync_request // OK. return users; } You also might have priority. What I mean by priority is if you look at Apple's Mail application on the iPhone, you'll notice they first suck down your entire POP/IMAP tree before making a second request to retrieve the first 2 lines (the default) of your message. I suppose my question to you experts is this. When are you using asynchronous, synchronous, threads -- and when are you using either async/sync in a thread? What kind of delegation system do you have setup to know what to do when a async request completes? Are you prioritizing your async requests? There's a gamut of solutions to this all too common problem. It's simple to hack something out. The problem is, I don't want to hack and I want to have something that's simple and easy to maintain.

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  • iPhone - Reset UINavigation Controller

    - by Ward
    Hey there, I have a UINavigationController inside a UITabBarController. When a user presses the first tab, I want to reset the navigation controller back to the first screen instead of displaying whichever view they last selected in the navigation controller. Is there an easy way to reset the stack? Thanks, Howie

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  • Best way to set default tint for UINavigationController

    - by Brian
    I use a lot of UINavigationControllers in my app. I am using a UIColor to set the tintcolor of the navigationBar. This works as expected, but I am trying to find an easy way to set a default tintcolor for all UINavigationControllers. What is the best way to do this? Is it subclassing the UINavigationController, or is there something better? Thanks for the help.

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  • Create a table of contents from a pdf file

    - by ryan
    I'm using quartz to display pdf content, and I need to create a table of contents to navigate through the pdf. From reading Apple's documentation I think I am supposed to use CGPDFDocumentGetCatalog, but I can't find any examples on how to use this anywhere. Any ideas?

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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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  • Why is UIControlTouchUpInside UNDEFINED?

    - by munchine
    I've got a simple question but it has got me confounded. The code below gets an UNDEFINED error for UIControlTouchUpInside. What do I need to include or import? If I comment out the line, it works. So that means forState:UIControlStateNormal is defined. I'm new so hope you can help. UIButton * button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; [button setTitle:@"Accept?" forState:UIControlStateNormal]; [button addTarget:self action:@selector(acceptTapped) forControlEvents:UIControlTouchUpInside];

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  • How to access pixels of an NSBitmapImageRep?

    - by Paperflyer
    I have an NSBitmapImageRep that is created like this: NSBitmapImageRep *imageRep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:NULL pixelsWide:waveformSize.width pixelsHigh:waveformSize.height bitsPerSample:8 samplesPerPixel:4 hasAlpha:YES isPlanar:YES colorSpaceName:NSCalibratedRGBColorSpace bytesPerRow:0 bitsPerPixel:0]; Now I want to access the pixel data so I get a pointer to the pixel planes using unsigned char *bitmapData; [imageRep getBitmapDataPlanes:&bitmapData]; According to the Documentation this returns a C array of five character pointers. But how can it do that? since the type of the argument is unsigned char **, it can only return an array of chars, but not an array of char pointers. So, this leaves me wondering how to access the individual pixels. Do you have an idea how to do that? (I know there is the method – setColor:atX:y:, but it seems to be pretty slow if invoked for every single pixel of a big bitmap.)

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  • Regular Expression doesn't match

    - by dododedodonl
    Hi All, I've got a string with very unclean HTML. Before I parse it, I want to convert this: <TABLE><TR><TD width="33%" nowrap=1><font size="1" face="Arial"> NE </font> </TD> <TD width="33%" nowrap=1><font size="1" face="Arial"> DEK </font> </TD> <TD width="33%" nowrap=1><font size="1" face="Arial"> 143 </font> </TD> </TR></TABLE> in NE DEK 143 so it is a bit easier to parse. I've got this regular expression (RegexKitLite): NSString *str = [dataString stringByReplacingOccurrencesOfRegex:@"<TABLE><TR><TD width=\"33%\" nowrap=1><font size=\"1\" face=\"Arial\">(.+?)<\\/font> <\\/TD>(.+?)<TD width=\"33%\" nowrap=1><font size=\"1\" face=\"Arial\">(.+?)<\\/font> <\\/TD>(.+?)<TD width=\"33%\" nowrap=1><font size=\"1\" face=\"Arial\">(.+?)<\\/font> <\\/TD>(.+?)<\\/TR><\\/TABLE>" withString:@"$1 $3 $5"]; I'm no an expert in Regex. Can someone help me out here? Regards, dodo

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  • XML Parsing need help iphone sdk

    - by neha
    Hi all, How do you get "MayurS123" from following xml tag by parsing? <eletitle lnk="http://192.168.10.2/justmeans/trunk/newsfeed/mayurs">MayurS123 Sharma</eletitle> My file is getting parsed properly. Here I'm able to retrieve the lnk component by doing: if([elementName isEqualToString:@"eletitle"]) { aGoodwork.lnk = [attributeDict objectForKey:@"lnk"]; } But I'm not getting how to get in actual title. Thanx in advance.

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  • UITableViewCell color issues with custom table view background

    - by Macatomy
    I have a UITableView with a custom background image set like this: self.tableView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"mybg.png"]]; The background appears fine, but my UITableViewCells (default cells, not custom) have some sort of weird tint to them, and the UILabel containing the "New Project" text also seems to have some sort of background behind it. How can I remove this? I've already tried: cell.backgroundColor = [UIColor clearColor]; cell.textLabel.backgroundColor = [UIColor clearColor]; Thanks

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  • Optimizing drawing on UITableViewCell

    - by Brian
    I am drawing content to a UITableViewCell and it is working well, but I'm trying to understand if there is a better way of doing this. Each cell has the following components: Thumbnail on the left side - could come from server so it is loaded async Title String - variable length so each cell could be different height Timestamp String Gradient background - the gradient goes from the top of the cell to the bottom and is semi-transparent so that background colors shine through with a gloss It currently works well. The drawing occurs as follows: UITableViewController inits/reuses a cell, sets needed data, and calls [cell setNeedsDisplay] The cell has a CALayer for the thumbnail - thumbnailLayer In the cell's drawRect it draws the gradient background and the two strings The cell's drawRect it then calls setIcon - which gets the thumbnail and sets the image as the contents of the thumbnailLayer. If the image is not found locally, it sets a loading image as the contents of the thumbnailLayer and asynchronously gets the thumbnail. Once the thumbnail is received, it is reset by calling setIcon again & resets the thumbnailLayer.contents This all currently works, but using Instruments I see that the thumbnail is compositing with the gradient. I have tried the following to fix this: setting the cell's backgroundView to a view whose drawRect would draw the gradient so that the cell's drawRect could draw the thumbnail and using setNeedsDisplayInRect would allow me to only redraw the thumbnail after it loaded --- but this resulted in the backgroundView's drawing (gradient) covering the cell's drawing (text). I would just draw the thumbnail in the cell's drawRect, but when setNeedsDisplay is called, drawRect will just overlap another image and the loading image may show through. I would clear the rect, but then I would have to redraw the gradient. I would try to draw the gradient in a CAGradientLayer and store a reference to it, so I can quickly redraw it, but I figured I'd have to redraw the gradient if the cell's height changes. Any ideas? I'm sure I'm missing something so any help would be great.

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  • Simple CalendarStore query puts application into infinite loop!?

    - by Frank R.
    Hi, I've been looking at adding iCal support to my new application and everything seemed just fine and worked on my Mac OS X 10.6 Snow Leopard development machine without a hitch. Now it looks like depending on what is in your calendar the very simple query below: - (NSArray*) fetchCalendarEventsForNext50Minutes { NSLog(@"fetchCalendarEventsForNext50Minutes"); NSTimeInterval start = [NSDate timeIntervalSinceReferenceDate]; NSDate* startDate = [[NSDate alloc] init]; NSDate* endDate = [startDate addTimeInterval: 50.0 * 60.0]; NSPredicate *eventsForTheNext50Minutes = [CalCalendarStore eventPredicateWithStartDate:startDate endDate:endDate calendars:[[CalCalendarStore defaultCalendarStore] calendars]]; // Fetch all events for this year NSArray *events = [[CalCalendarStore defaultCalendarStore] eventsWithPredicate: eventsForTheNext50Minutes]; NSLog( @"fetch took: %f seconds", [NSDate timeIntervalSinceReferenceDate] - start ); return events; } produces a beachball thrash even with quite limited events in the calendar store. Am I missing something crucial here? The code snippet is pretty much exactly from the documentation at: // Create a predicate to fetch all events for this year NSInteger year = [[NSCalendarDate date] yearOfCommonEra]; NSDate *startDate = [[NSCalendarDate dateWithYear:year month:1 day:1 hour:0 minute:0 second:0 timeZone:nil] retain]; NSDate *endDate = [[NSCalendarDate dateWithYear:year month:12 day:31 hour:23 minute:59 second:59 timeZone:nil] retain]; NSPredicate *eventsForThisYear = [CalCalendarStore eventPredicateWithStartDate:startDate endDate:endDate calendars:[[CalCalendarStore defaultCalendarStore] calendars]]; // Fetch all events for this year NSArray *events = [[CalCalendarStore defaultCalendarStore] eventsWithPredicate:eventsForThisYear]; It looks like it has something to do with the recurrence rules, but as far as I can see there are no other ways of fetching events from the calendar store anyway. Has anybody else come across this? Best regards, Frank

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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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  • Framework for iPhone wait screens

    - by 4thSpace
    I ran across a small framework some time back that someone put together for iPhone wait screens. But now I can't find any trace of it. Does anyone have a link to it? It may not be a framework as much as a few code snippets. But the guy had it all pre-made. You just needed to implement and specify the type of wait screen you wanted.

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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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  • Printing an invisible NSView

    - by Rodger Wilson
    Initially I created a simple program with a custom NSView. I drew a picture (certificate) and printed it! beautiful! Everything worked great! I them moved my custom NSView to an existing application. My hope was that when a user hit print it would print this certificate. Simple enough. I figured a could have a NSView pointer in my controller code. Then at initialization I would populate the pointer. Then when someone wanted to print the certificate it would print. The problem is that all of my drawing code is in the "drawRect" method. This method doesn't get called because this view is never displayed in a window. I have heart that others use non-visible NSView objects just for printing. What do I need to do. I really don't want to show this view to the screen. Rodger

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  • imageWithCGImage and memory

    - by Adam Ernst
    If I use [UIImage imageWithCGImage:], passing in a CGImageRef, do I then release the CGImageRef or does UIImage take care of this itself when it is deallocated? The documentation isn't entirely clear. It says "This method does not cache the image object." Originally I called CGImageRelease on the CGImageRef after passing it to imageWithCGImage:, but that caused a malloc_error_break warning in the Simulator claiming a double-free was occurring.

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  • Memory over-release problem when I am animating UIView

    - by Sheehan Alam
    I have enabled NSZombie's and I am getting the following message in my console when I am running my application: *** -[UIViewAnimationState release]: message sent to deallocated instance 0xf96d7e0 Here is the method that is performing the animation -(void)loadAvatar:(STObject*)st { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; avatar.alpha = 0; avatar.frame = avatarRectSmall; avatar.image = [ImageCache getMemoryCachedImageAtUrl:st.avatar_url]; [UIView beginAnimations:nil context:nil]; [UIView setAnimationDuration:.50]; avatar.frame = avatarRectNormal; [avatar setAlpha:1]; [UIView commitAnimations]; [pool release]; pool = nil; } I don't always get a crash, only sometimes. I'm wondering what is getting released?

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  • Scripting Bridge generates error creating a new playlist in iTunes on 10.5, but not 10.6

    - by Simone Manganelli
    I'm having a problem with the Scripting Bridge framework in 10.5. Specifically, I use this code to create a new user playlist in iTunes: NSDictionary *propertiesDict = [NSDictionary dictionaryWithObject:@"playlistName" forKey:@"name"]; playlistToReturn = (iTunesUserPlaylist*)[[[iTunesApp classForScriptingClass:@"user playlist"] alloc] initWithProperties:propertiesDict]; SBElementArray *sourcesArray = [iTunesApp sources]; iTunesSource *librarySource = [sourcesArray objectAtIndex:0]; SBElementArray *userPlaylistsArray = [librarySource userPlaylists]; [userPlaylistsArray addObject:playlistToReturn]; This code works fine in 10.6. The playlist is created correctly, and I can add songs to it later. However, on 10.5, an error is generated: Apple event:'core'\'crel'{ 'kocl':'cUsP', 'insh':'insl'{ 'kobj':'obj '{ 'want':'cUsP', 'from':'obj '{ 'want':'cSrc', 'from':'null'(), 'form':'ID ', 'seld':42 }, 'form':'indx', 'seld':'abso'($206C6C61$) }, 'kpos':'end ' }, 'prdt':{ 'pnam':'utxt'("playlistName") } }; Error Domain=SBError Code=-10014 UserInfo=0x152c8cb0 "Operation could not be completed. (SBError error -10014.)" Why?

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  • Looking for popUpMenuPositioningItem:atLocation:inView: equivalent for 10.5

    - by Daniel Jette
    I'm working on an application that needs to display a context menu on screen in various scenarios. In the function I'm writing, I don't have access to any NSWindows or NSViews. I'd like to use popUpMenuPositioningItem:atLocation:inView as this function works perfectly for me in 10.6. However, we have a requirement to support 10.5, so this function isn't available to me. The feature I'm most interested in, as stated in the documentation is: If view is nil, the location is interpreted in the screen coordinate system. This allows you to pop up a menu disconnected from any window. Basically, I need to display the context menu given a location on screen, but without any associated view. Is there any way to achieve this on 10.5?

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