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  • Good websites and/or books to learn game algorithms?

    - by Moshe
    I'm interested in learning video game algorithms. (For iPhone particularly, but generally as well. I assume certain concepts are the same.) I am best off (personally) learning from a book but websites are useful too. What has helped you learn game programming algorithms and concepts? EDIT: As per request, I'll clarify the types of algorithms... I was looking for any algorithms really, but I guess I was interested in (top-down view) platformer algorithms, but, now that you mention it, Seth, I do wonder about chess...

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  • Doesn't [UIWindow addSubView:] retain?

    - by Dan Ray
    Check it: NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; NSLog(@"Checking login--user value is %@", [defaults valueForKey:@"userID"]); if ([defaults valueForKey:@"userID"] == NULL){ LoginViewController *loginController = [[LoginViewController alloc] initWithNibName:@"LoginView" bundle:nil]; [window addSubview:loginController.view]; [loginController release]; } else { [window addSubview:[navigationController view]]; } Every other place when I put a subview into another view, I release that view after I've done that, because it's now owned by the view it's a subview of. HERE, though, when I do [loginController release], every IBAction on that loginController gets called against a deallocated instance. Commenting out that line makes everything work. I note the difference in approach between my loginController and the navigationController that came with the template; the navigationController is a synthesized property that gets released in -(void)dealloc{ }, so it's still around after being put into window.

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  • inserting values from array to table view

    - by shishir.bobby
    hi all, i hv an array parsed from xml which looks like this de <0Merkel <1AppleIphone <2Sag ich nicht <3youporn.com <4ICQ Service <5Sozialamt <6Liebesengel <7Hartz 4 i am able to set this list into table view's cell, but the problem is i am not able to break each entry for each cell..evrything is coming up in a ssingle row, how can i get each entry in each row? regards shishir

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  • Any example on how to implement the new VerificationController and the KNOWN_TRANSACTIONS_KEY constant?

    - by Carles Estevadeordal
    I've been looking at implementing the new VerificationController to verify in-App-Purchases: http://developer.apple.com/library/ios/#releasenotes/StoreKit/IAP_ReceiptValidation/_index.html And I wonder if there is some example anywhere en how to validate a transaction, since it seems that the - (BOOL)verifyPurchase:(SKPaymentTransaction *)transaction; is not enough and it has to be implemented internally to verify the purchase when the data form the server is received. Another question is if anyone has a clue on what the KNOWN_TRANSACTIONS_KEY is and how to fill it, is it just the product id of the purchase?

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  • Before data is entered, is there a way to make a grouped table graphic placeholder?

    - by Matt Winters
    I have a grouped table with 3 sections, each section with a title. The 1st and 3rd sections always have only 1 row of information so before any user data is entered, I just put some words like "Enter Data Here..." as placeholder text. This text is edited (replaced) by the user with their own actual data. No problem. The 2nd section however will contain several rows of information entered by user and I'd prefer not to enter placeholder data in row 0, having the user Edit the first row of data then Add subsequent rows. If the numberOfRowsInSection is set to 0, the title for the 3rd section comes close to the title for the 2nd section and it looks ugly. The best that I could come with, and I don't know to do it, is to have a fake graphic placeholder on the striped background (between the 2nd and third titles) that looks like a single row in the 2nd section, put "Enter Data Here..." text in the graphic, and then the first row of actual data entered and all subsequent rows will cover it up. Can anyone tell me how to do this or offer a better suggestion. Thanks.

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  • Capture Touch Event on UITableViewCell and after enter didSelectRowAdTindePath method

    - by Luca
    Hi I want to personalize my UITableView changing background when user tap on a specific cell. I've a dedicated ViewController for each cell and if I implement touchesBegan method in this viewController i can change my cell background without any problem. The problem is that the method "didSelectRowAtIndexPath" of the UITableView is no longer called. How can I call it manually? I am in another viewController and I have no access to that method. or how can propagate to the touch tableView? Thanks a lot

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  • [NSCFNumber _isNaturallyRTL]: unrecognized selector sent to instance 0x605ac10

    - by Risma
    my app got crashed an showed that keyword. There is no error and warning. can some body help me?? this is stack that showed : Call stack at first throw: ( 0 CoreFoundation 0x012ccbe9 __exceptionPreprocess + 185 1 libobjc.A.dylib 0x014215c2 objc_exception_throw + 47 2 CoreFoundation 0x012ce6fb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187 3 CoreFoundation 0x0123e366 ___forwarding___ + 966 4 CoreFoundation 0x0123df22 _CF_forwarding_prep_0 + 50 5 UIKit 0x0042d35e -[UITextField setText:] + 53 6 Koder232_risma_edited 0x0006427a -[FilePropertiesViewController viewWillAppear:] + 442 7 UIKit 0x003c4d52 -[UIView(Hierarchy) _willMoveToWindow:withAncestorView:] + 207 8 UIKit 0x003cfa2b -[UIView(Hierarchy) _makeSubtreePerformSelector:withObject:withObject:copySublayers:] + 378 9 UIKit 0x003cfa5c -[UIView(Hierarchy) _makeSubtreePerformSelector:withObject:withObject:copySublayers:] + 427 10 UIKit 0x003cfa5c -[UIView(Hierarchy) _makeSubtreePerformSelector:withObject:withObject:copySublayers:] + 427 11 UIKit 0x003c6b36 -[UIView(Internal) _addSubview:positioned:relativeTo:] + 370 12 UIKit 0x003c514f -[UIView(Hierarchy) addSubview:] + 57 13 UIKit 0x006ad8ae -[UIPopoverView presentFromRect:inView:contentSize:backgroundStyle:animated:] + 1920 14 UIKit 0x006a0a4c -[UIPopoverView presentFromRect:inView:animated:] + 236 15 UIKit 0x006d9b20 -[UIPopoverController presentPopoverFromRect:inView:permittedArrowDirections:animated:] + 1046 16 Koder232_risma_edited 0x0001f90f -[codeViewController arrangeTabWithTypeGesture:andNumtag:] + 4683 17 Koder232_risma_edited 0x0001e68f -[codeViewController setTap2:] + 99 18 UIKit 0x0061e9c7 -[UIGestureRecognizer _updateGestureWithEvent:] + 727 19 UIKit 0x0061a9d6 -[UIGestureRecognizer _delayedUpdateGesture] + 47 20 UIKit 0x00620fa5 _UIGestureRecognizerUpdateObserver + 584 21 UIKit 0x0062118a _UIGestureRecognizerUpdateGesturesFromSendEvent + 51 22 UIKit 0x003bc6b4 -[UIWindow _sendGesturesForEvent:] + 1292 23 UIKit 0x003b7f87 -[UIWindow sendEvent:] + 105 24 UIKit 0x0039b37a -[UIApplication sendEvent:] + 447 25 UIKit 0x003a0732 _UIApplicationHandleEvent + 7576 26 GraphicsServices 0x0191fa36 PurpleEventCallback + 1550 27 CoreFoundation 0x012ae064 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52 28 CoreFoundation 0x0120e6f7 __CFRunLoopDoSource1 + 215 29 CoreFoundation 0x0120b983 __CFRunLoopRun + 979 30 CoreFoundation 0x0120b240 CFRunLoopRunSpecific + 208 31 CoreFoundation 0x0120b161 CFRunLoopRunInMode + 97 32 GraphicsServices 0x0191e268 GSEventRunModal + 217 33 GraphicsServices 0x0191e32d GSEventRun + 115 34 UIKit 0x003a442e UIApplicationMain + 1160 35 Koder232_risma_edited 0x00002680 main + 102 36 Koder232_risma_edited 0x00002611 start + 53 37 ??? 0x00000001 0x0 + 1 )

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  • Can I include a NSUserDefault password test in AppDelegate to load a loginView?

    - by Michael Robinson
    I have a name and password in NSUserDefaults for login. I want to place a test in my AppDelegate.m class to test for presence and load a login/signup loginView.xib modally if there is no password or name stored in the app. Here is the pulling of the defaults: -(void)refreshFields { NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; usernameLabel.text = [defaults objectForKey:kUsernameKey]; passwordLabel.text = [defaults objectForKey:kPasswordKey]; Here is the tabcontroller loading part: - (void)applicationDidFinishLaunching:(UIApplication *)application { firstTab = [[FirstTab alloc] initWithStyle:UITableViewStylePlain]; UINavigationController *firstNavigationController = [[UINavigationController alloc] initWithRootViewController:firstTab]; [firstTab release]; secondTab = // EDITED FOR SPACE thirdTab = // EDITED FOR SPACE tabBarController = [[UITabBarController alloc] init]; tabBarController.viewControllers = [NSArray arrayWithObjects:firstNavigationController, secondNavigationController, thirdNavigationController, nil]; [window addSubview:tabBarController.view]; [firstNavigationController release]; [secondNavigationController release]; [thirdNavigationController release]; [self logout]; [window makeKeyAndVisible]; Here is where the loginView.xib loads automatically: - (void)logout { loginViewController = [[LoginViewController alloc] initWithNibName:@"LoginView" bundle:nil]; UINavigationController *loginNavigationController = [[UINavigationController alloc] initWithRootViewController:loginViewController]; [loginViewController release]; [tabBarController presentModalViewController:loginNavigationController animated:YES]; [loginNavigationController release]; } I want to replace the above autoload with a test similar to below (that works) using IF-ELSE - (void)logout { if ([usernameLabel.text length] == 0 || [passwordLabel.text length] == 0) { loginViewController = [[LoginViewController alloc] initWithNibName:@"LoginView" bundle:nil]; UINavigationController *loginNavigationController = [[UINavigationController alloc] initWithRootViewController:loginViewController]; [loginViewController release]; [tabBarController presentModalViewController:loginNavigationController animated:YES]; [loginNavigationController release]; }else { [window addSubview:tabBarController.view];} Thanks in advance, I'm totally lost on this.

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  • UIDatePicker hours are disabled

    - by user112175
    I have a UIDatePicker object and I am setting it up as follows but for some reason my hours field is disabled on the current date but minutes are not. Not exactly sure what I am missing, any help would be appreciated. UIDatePicker *picker = [[UIDatePicker alloc] init]; picker.date = [NSDate dateWithTimeIntervalSinceNow:DATE_MIN_SECONDS_OFFSET]; picker.minimumDate = [NSDate dateWithTimeIntervalSinceNow:DATE_MIN_SECONDS_OFFSET]; This is what My datepicker looks like http://img.skitch.com/20100417-d75gq78pjwjb9d37ku9msmcduc.png

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  • Objective-C woes: cellForRowAtIndexPath crashes.

    - by Mr. McPepperNuts
    I want to the user to be able to search for a record in a DB. The fetch and the results returned work perfectly. I am having a hard time setting the UItableview to display the result tho. The application continually crashes at cellForRowAtIndexPath. Please, someone help before I have a heart attack over here. Thank you. @implementation SearchViewController @synthesize mySearchBar; @synthesize textToSearchFor; @synthesize myGlobalSearchObject; @synthesize results; @synthesize tableView; @synthesize tempString; #pragma mark - #pragma mark View lifecycle - (void)viewDidLoad { [super viewDidLoad]; } #pragma mark - #pragma mark Table View - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { //handle selection; push view } - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{ /* if(nullResulSearch == TRUE){ return 1; }else { return[results count]; } */ return[results count]; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return 1; // Test hack to display multiple rows. } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Search Cell Identifier"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if(cell == nil){ cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue2 reuseIdentifier:CellIdentifier] autorelease]; } NSLog(@"TEMPSTRING %@", tempString); cell.textLabel.text = tempString; return cell; } #pragma mark - #pragma mark Memory management - (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; } - (void)viewDidUnload { self.tableView = nil; } - (void)dealloc { [results release]; [mySearchBar release]; [textToSearchFor release]; [myGlobalSearchObject release]; [super dealloc]; } #pragma mark - #pragma mark Search Function & Fetch Controller - (NSManagedObject *)SearchDatabaseForText:(NSString *)passdTextToSearchFor{ NSManagedObject *searchObj; UndergroundBaseballAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate]; NSManagedObjectContext *managedObjectContext = appDelegate.managedObjectContext; NSFetchRequest *request = [[NSFetchRequest alloc] init]; NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name == [c]%@", passdTextToSearchFor]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"Entry" inManagedObjectContext:managedObjectContext]; NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:NO]; NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil]; [request setSortDescriptors:sortDescriptors]; [request setEntity: entity]; [request setPredicate: predicate]; NSError *error; results = [managedObjectContext executeFetchRequest:request error:&error]; if([results count] == 0){ NSLog(@"No results found"); searchObj = nil; nullResulSearch == TRUE; }else{ if ([[[results objectAtIndex:0] name] caseInsensitiveCompare:passdTextToSearchFor] == 0) { NSLog(@"results %@", [[results objectAtIndex:0] name]); searchObj = [results objectAtIndex:0]; nullResulSearch == FALSE; }else{ NSLog(@"No results found"); searchObj = nil; nullResulSearch == TRUE; } } [tableView reloadData]; [request release]; [sortDescriptors release]; return searchObj; } - (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar{ textToSearchFor = mySearchBar.text; NSLog(@"textToSearchFor: %@", textToSearchFor); myGlobalSearchObject = [self SearchDatabaseForText:textToSearchFor]; NSLog(@"myGlobalSearchObject: %@", myGlobalSearchObject); tempString = [myGlobalSearchObject valueForKey:@"name"]; NSLog(@"tempString: %@", tempString); } @end *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[UILongPressGestureRecognizer isEqualToString:]: unrecognized selector sent to instance 0x3d46c20'

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  • having a test debug app and a released debug app side by side

    - by Tristan
    Yo! When I download my app from the iStore, the latest test version installed to my phone gets over written. Does anyone know how to have two versions of the same app side by side? On a test project, I edited the build settings so that "realease" and "debug" have different product names. This seemed to solve my problem, however when I try this same trick on my actual project, the two overwrite each other again. Does anyone have a recommendation? I don't mind how it's done. Thanks! Tristan

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  • Are Subversion 1.6 & Xcode 3.2 compatible?

    - by Meltemi
    Trying to get Xcode to work with Subversion server. Server: Subversion upgraded to 1.6.9 (Mac OS X Leopard 10.5.8) Client: Xcode 3.2.1 (Snow Leopard 10.6.2 with Subversion 1.6.5 though not sure that matters) Repository on server is setup and working fine via command line. However, I get an error when trying to create the Repository connection in Xcode: Error: 160043 (Unsupported FS format) Description: Expected FS format '2'; found format '4' a Google search seems to say that the server needs to be updated...but it's running 1.6.9 which is the most current version I'm aware of. Anyone know how to make this work? Is it even possible? I'm well aware of the command line usage but I would like to get Xcode & SVN talking... Revisiting this after some time: Using command line: username$ svn+ssh://hostname/Library/Subversion/Repository/test yields the same result: Description: Expected FS format '2'; found format Can anyone verify that I need to upgrade Subversion on the client machine to match version on server (1.6.9)?!? was hoping i wouldn't have to unless it was a "major" revision (ie. 1.5.x - 1.6.x)

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  • NSOperation and UIKit problem

    - by Infinity
    Hello guys! I am doing my download with an object which was inherited from NSOperation. I have read the documentation and when my operation finished I must call the [self.delegate performSelectorOnMainThread:@selector(operationDidFinish:) withObject:self waitUntilDone:YES]; method. It needs to be called on the main thread, because the UIKit is not thread safe and the documentation says this in these non thread safe frameworks cases. In the delegate method I am drawing a pdf or an image, but because it is drawn on the main thread the User Interface is very laggy until the drawing is finished. Maybe can you suggest me a good way to avoid this problem?

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  • Cocoa Touch UITableView Alphabetical '#' Match All Unmatched

    - by Kevin Sylvestre
    I have a UITableView containing names that I would like to group (and sort) by the first letter (similar to the Address Book application). I am currently able to match any section ('A'-'Z') using: // Sections is an array of strings "{search}" and "A" to "Z" and "#". NSString *pattern = [self.sections objectAtIndex:section]; NSPredicate *predicate = nil; // Ignore search pattern. if ([pattern isEqualToString:@"{search}"]) return nil; // Non-Alpha and Non-Diacritic-Alpha (?). if ([pattern isEqualToString:@"#"]); // Default case (use case and diacritic insensitivity). if (!predicate) predicate = [NSPredicate predicateWithFormat:@"name beginswith[cd] %@", pattern]; // Return filtered results. return [self.friends filteredArrayUsingPredicate:predicate]; However, matching for the '#' eludes me. I tried constructing a REGEX match using: [NSPredicate predicateWithFormat:@"name matches '[^a-zA-Z].*'"]; But this fails for diacritic-alpha (duplicate rows appear). Any ideas would be greatly appreciated! Thanks.

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  • Callback for camera shutter open event

    - by Raj
    Hi all, I have been working around in UIImagePickerController and am struck with a problem where I need to get the precise moment when the camera shutter opens in UIImagePickerController when the source type is set to camera (UIImagePickerControllerSourceTypeCamera). I have done some googling around and have realized that no one had such strange requirement! I looked around the docs of UIImagePickerController and UIImagePickerControllerDelegate hoping to get some delegate method / callback indicating the camera shutter open event, but did not find any. Any suggestions? Thanks for any help, Raj Pawan

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  • UISearchBarBackground Class

    - by Jim Bonner
    I am using the following piece of code to hide the background on a UISearchBar: [[searchView.subviews objectAtIndex:0] setHidden:YES]; Pretty simple, but I worry about hard coding a position in a subview list. So I went looking for the UISearchBarBackground.h file and cannot find it. Does any know where the definition is hiding?

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  • How to unset delegate on UIView setAnimationDelegate: call?

    - by morticae
    I am receiving crash reports that appear to be from a UIView animation calling a delegate that has been dealloced. Thread 0 Crashed: 0 libobjc.A.dylib 0x334776f6 objc_msgSend + 18 1 UIKit 0x31c566c4 -[UIViewAnimationState sendDelegateAnimationDidStop:finished:] 2 UIKit 0x31c565d2 -[UIViewAnimationState animationDidStop:finished:] 3 QuartzCore 0x30045a26 run_animation_callbacks I am setting the current view controller as the delegate for animations using the following pattern: [UIView beginAnimations:nil context:NULL]; [UIView setAnimationBeginsFromCurrentState:YES]; [UIView setAnimationDuration:0.5]; [UIView setAnimationDelegate:self]; ... [UIView commitAnimations]; My question is, how do I set that delegate reference to nil in my dealloc method? Is there some way to retain a reference to an animation? Or fetch animations in progress?

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  • How to Anti-Alias Layers in iPhoneOS

    - by Shannon A.
    We've had Reiner Knizia's Money out for a couple of months now. It's done pretty well, and so we've been updating it as time allows. However, one thing continues to bug me. I've never been able to get my layered cards to anti-alias correctly. Here's a sample: Cards that are laid straight are very clean, but whenever they're angled the black lines around the cards get jagged. I've tried this depending on both lines implicit to the artwork and lines drawn through drawRect:, and they both do the same thing. I've tried the edgeAntiAliasingMask and it doesn't do a thing as far as I can tell. I've tried masksToBounds for the sublayers set to NO and YES. Right now my card is set up as a CALayer that has sub-CALayers for the front and the back, plus for a few other things like a lightening mask and a darkening mask. Here's some snippets of the code: CArdLayer *theCardLayer = [CArdLayer layer]; theCardLayer.edgeAntialiasingMask = kCALayerLeftEdge | kCALayerRightEdge | kCALayerBottomEdge | kCALayerTopEdge; theCardLayer.front = [CALayer layer]; theCardLayer.front.edgeAntialiasingMask = kCALayerLeftEdge | kCALayerRightEdge | kCALayerBottomEdge | kCALayerTopEdge; theCardLayer.front.bounds = theCardLayer.bounds; theCardLayer.front.masksToBounds = YES; theCardLayer.front.contents = (id)[cardDrawing CGImage]; [theCardLayer addSublayer:theCardLayer.front]; Etc ... Any ideas on how to make the cards actually anti-alias?

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  • Properly setting up willSelectRowAtIndexPath and didSelectRowAtIndexPath to send cell selections

    - by Gordon Fontenot
    Feel like I'm going a bit nutty here. I have a detail view with a few stand-alone UITextFields, a few UITextFields in UITAbleViewCells, and one single UITableViewCell that will be used to hold notes, if there are any. I only want this cell selectable when I am in edit mode. When I am not in edit mode, I do not want to be able to select it. Selecting the cell (while in edit mode) will fire a method that will init a new view. I know this is very easy, but I am missing something somewhere. Here are the current selection methods I am using: -(NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath { if (!self.editing) { NSLog(@"Returning nil, not in edit mode"); return nil; } NSLog(@"Cell will be selected, not in edit mode"); if (indexPath.section == 0) { NSLog(@"Comments cell will be selected"); return indexPath; } return nil; } -(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { if (!self.editing) { NSLog(@"Not in edit mode. Should not have made it this far."); return; } if (indexPath.section == 0) [self pushCommentsView]; else return; } My problem is really 2 fold; 1) Even when I'm not in edit mode, and I know I am returning nil (due to the NSLog message), I can still select the row (it flashes blue). From my understanding of the willSelectRowAtIndexPath method, this shouldn't be happening. Maybe I am wrong about this? 2) When I enter edit mode, I can't select anything at all. the willSelectRowAtIndexPath method never fires, and neither does the didSelectRowAtIndexPath. The only thing I am doing in the setEditing method, is hiding the back button while editing, and assigning firstResponder to the top textField to get the keyboard to pop up. I thought maybe the first responder was getting in the way of the click (which would be dumb), but even with that commented out, I cannot perform the cell selection during editing.

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  • What are some methods to debug Javascript inside of a UIWebView?

    - by bpapa
    I'm trying to figure out why something with Javascript isn't working inside of a UIWebView. To my knowledge, there is no way to set a breakpoint inside of XCode for a js file. No problemo, I'll just go back to 2004 and use alert statemen-- oh wait they don't seem to work inside of a UIWebView either! The only thing I could think of is by exporting my HTML And JS files to my desktop and then just doing my debugging inside of Safari. And that works! But of course, the bug I'm fighting with in the UIWebView doesn't occur in Safari. Are there any other ways for debugging inside of a UIWebView, or any tricks that I can use akin to using the old-school alert method?

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