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  • Preload/predisplay tiles in a CATiledLayer?

    - by jemmons
    On the iPhone (though I imagine it's an equally valid question in Cocoa) I have a UIScrollView around a UIView backed by a CATiledLayer. The way it works by default is to load any uncached/unfetched tiles when my viewport scrolls over a blank section of the CATiledLayer. What I would like to know is if there's a way to trigger CATiledLayer to load a tile that's not actively being displayed? I would like to, for example, preload all tiles contiguous to the currently displayed tile while they are still offscreen, thus avoiding flashing a blank screen that fades in to the image once it's loaded asynchronously. Any ideas?

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  • What's better way to build NSPredicate with to-many deep relationships?

    - by Victor
    Hello, I have three entities: EntityA, EntityB and EntityC connected with to-many relationships. See schema for details: For getting all instance of EntityA which depend from EntityB.name I use the predicate like this: NSPredicate *predicate = [NSPredicate predicateWithFormat:@"ANY EntityB.name like 'SomeName'"]; What should be predicate for getting all instance of EntityA which depend from EntityC.name? I tried query like @"ANY EntityB.entitiesC.name like 'SomeName'" but get exception "multiple to-many keys not allowed here". Best regards, Victor

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  • RDLC - Adding a Data Source in VS2010

    - by Kezzer
    Greetings. I have an RDLC file and am wanting to add a data source to it, although without any luck so far. The data source is a custom class written by myself (just to add, we do this all the time). We recently converted over to the VS2010 RDLC format which caused some problems, but we've made some changes to our implementation that workaround the more major issues. So, back to the issue at hand, when I attempt to add my data source to the DummyDataSource list in the RDLC view in VS2010 it just does nothing, however it does add the data source to the list of data sources, but you can't select it from the drop-down list in the RDLC view which means I can't add the data source at all. Has anyone come across this problem? Is there anything I need to check? I've searched with fervour and had no luck.

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  • Trigerring other animation after first ending Animation (Objetive-C)

    - by ludo
    Hi, I have a simple animation which simply modify the position of a button: [UIView beginAnimation:nil context:nil]; [UIView setAnimationsDuration:3.0]; [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut]; mybutton.frame = CGREctMake(20, 233, 280, 46); [UIView commitAnimations]; I want to perform some other animations when this one is finish, how to do that?

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  • How do I change the frame position for a custom MKAnnotationView?

    - by andrei
    I am trying to make a custom annotation view by subclassing MKAnnotationView and overriding the drawRect method. I want the view to be drawn offset from the annotation's position, somewhat like MKPinAnnotationView does it, so that the point of the pin is at the specified coordinates, rather than the middle of the pin. So I set the frame position and size as shown below. However, it doesn't look like I can affect the position of the frame at all, only the size. The image ends up being drawn centered over the annotation position. Any tips on how to achieve what I want? MyAnnotationView.h: @interface MyAnnotationView : MKAnnotationView { } MyAnnotationView.m: - (id)initWithAnnotation:(id <MKAnnotation>)annotation reuseIdentifier:(NSString *)reuseIdentifier { if (self = [super initWithAnnotation:annotation reuseIdentifier:reuseIdentifier]) { self.canShowCallout = YES; self.backgroundColor = [UIColor clearColor]; // Position the frame so that the bottom of it touches the annotation position self.frame = CGRectMake(0, -16, 32, 32); } return self; } - (void)drawRect:(CGRect)rect { [[UIImage imageNamed:@"blue-dot.png"] drawInRect:rect]; }

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  • How do i rotate a CALayer around a diagonal line?

    - by Mattias Wadman
    Hi. I'm trying to implement a flip animation to be used in board game like iPhone-application. The animation is supposed to look like a game piece that rotates and changes to the color of its back (kind of like an Reversi piece). I've managed to create an animation that flips the piece around its orthogonal axis, but when I try to flip it around a diagonal axis by changing the rotation around the z-axis the actual image also gets rotated (not surprisingly). Instead I would like to rotate the image "as is" around a diagonal axis. I have tried to change layer.sublayerTransform but with no success. Here is my current implementation. It works by doing a trick to resolve the issue of getting a mirrored image at the end of the animation. The solution is to not actually rotate the layer 180 degrees, instead it rotates it 90 degrees, changes image and then rotates it back. + (void)flipLayer:(CALayer *)layer toImage:(CGImageRef)image withAngle:(double)angle { const float duration = 0.5f; CAKeyframeAnimation *diag = [CAKeyframeAnimation animationWithKeyPath:@"transform.rotation.z"]; diag.duration = duration; diag.values = [NSArray arrayWithObjects: [NSNumber numberWithDouble:angle], [NSNumber numberWithDouble:0.0f], nil]; diag.keyTimes = [NSArray arrayWithObjects: [NSNumber numberWithDouble:0.0f], [NSNumber numberWithDouble:1.0f], nil]; diag.calculationMode = kCAAnimationDiscrete; CAKeyframeAnimation *flip = [CAKeyframeAnimation animationWithKeyPath:@"transform.rotation.y"]; flip.duration = duration; flip.values = [NSArray arrayWithObjects: [NSNumber numberWithDouble:0.0f], [NSNumber numberWithDouble:M_PI / 2], [NSNumber numberWithDouble:0.0f], nil]; flip.keyTimes = [NSArray arrayWithObjects: [NSNumber numberWithDouble:0.0f], [NSNumber numberWithDouble:0.5f], [NSNumber numberWithDouble:1.0f], nil]; flip.calculationMode = kCAAnimationLinear; CAKeyframeAnimation *replace = [CAKeyframeAnimation animationWithKeyPath:@"contents"]; replace.duration = duration / 2; replace.beginTime = duration / 2; replace.values = [NSArray arrayWithObjects:(id)image, nil]; replace.keyTimes = [NSArray arrayWithObjects: [NSNumber numberWithDouble:0.0f], nil]; replace.calculationMode = kCAAnimationDiscrete; CAAnimationGroup *group = [CAAnimationGroup animation]; group.removedOnCompletion = NO; group.duration = duration; group.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear]; group.animations = [NSArray arrayWithObjects:diag, flip, replace, nil]; group.fillMode = kCAFillModeForwards; [layer addAnimation:group forKey:nil]; }

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  • iPhone hitTest broken after rotation

    - by Adam
    Hi all, I have a UIView that contains a number of CALayer subclasses. I am using the following code to detect which layer a touch event corresponds to: - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; CGPoint touchPoint = [touch locationInView:self]; NSLog(@"%@,%@",NSStringFromCGPoint(point),[self.layer hitTest:point].name); } This works fine until the device is rotated. When the device is rotated all current layers are removed from the superlayer, and new CALayers are created to fit the new orientation. The new layers are correctly inserted and viewable in the correct orientation. After the rotation the hitTest method consistently returns nil when clearly clicking on the newly created layers and registers for locations of layers which are incorrect. The coordinates of the hit test are correct, but no layers are found. Am I missing a function call or something after handling the rotation? Cheers, Adam

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  • Turn a page (a UIWebView) with an animation

    - by Stefan
    Hi, I have a webview, which shows the pages of a ebook. I want to switch from one page to the next page with a page curl animation. By now, I'm know how to switch the page and how to apply a page curl animation on the webview. But how do I apply the curl animation in a way that it looks like flipping from one page to another?

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  • Reverse geocode without using MKReverseGeocoder

    - by SpH1nX
    Hi guys, I'm trying to detect current user address using MKReverseGeocoder passing coordinates obtained via CLLocation class. Reading MKReverseGeocoder Class Reference I noticed that The Google terms of service require that the reverse geocoding service be used in conjunction with a Google map; take this into account when designing your application's user interface. so I'm wondering if (and eventually how) can I reverse geocode user current location on iPhone OS SDK 3.1.3. I thought using Google Maps API but the EULA has the same obligation. Yahoo Maps API is even worse and Microsoft one aren't free.

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  • Does it make sense to use a NSFetchedResultsController without an UITableViewController? How are the

    - by dontWatchMyProfile
    I mean... could I also just create a plain old UIViewController and then set up a UITableView myself, plus an NSFetchedResultsController? How much do UITableViewController and NSFetchedResultsController interact with eachother? As far as I see it, UITableViewController is NOT by default already adopting the NSFetchedResultsControllerDelegate protocol. It almost looks like if UITableViewController has been developed without knowing about NSFetchedResultsController. Probably they even did that before developing FRC. Anyways, just a raw guess because the UITableViewController lacks of mentioning FRC at all. So the only thing I see in UITableViewController is that it is already the delegate for a UITableView by adopting the protocol, and it sets up the UITableView instance for me and assigns it internally to it's tableView property. Is that the whole magic of UITableViewController? (note: the nsfetchedresultscontrolle tag is not a typo. SO has a limit for the num of chars...too bad for that missing r, that's why I avoided this tag in my other buch of questions like the plague)

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  • Rotate a CALayer when it reaches a certain position

    - by jbrennan
    I've got a CALayer with two CAKeyframeAnimations added to it. One is for @"transform" and the other is for @"position". I am rotating the layer and translating it with these two animations. I am wondering, is there a way I can set the keyframes to happen at the same time? I want to have a keyframe for rotation at the exact time my layer has reached a certain (x, y) position. How is this possible?

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  • Animating a CALayer's mask size change

    - by Alexander Repty
    I have a UIView subclass which uses a CAShapeLayer mask on its CALayer. The mask uses a distinct shape, with three rounded corners and a cut out rectangle in the remaining corner. When I resize my UIView using a standard animation block, the UIView itself and its CALayer resize just fine. The mask, however, is applied instantly, which leads to some drawing issues. I've tried animating the mask's resizing using a CABasicAnimation but didn't have any luck getting the resizing animated. Can I somehow achieve an animated resizing effect on the mask? Do I need to get rid of the mask, or will I have to change something about the way I currently draw the mask (using - (void)drawInContext:(CGContextRef)ctx). Cheers, Alex

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  • Database design for very large amount of data

    - by Hossein
    Hi, I am working on a project, involving large amount of data from the delicious website.The data available is at files are "Date,UserId,Url,Tags" (for each bookmark). I normalized my database to a 3NF, and because of the nature of the queries that we wanted to use In combination I came down to 6 tables....The design looks fine, however, now a large amount of data is in the database, most of the queries needs to "join" at least 2 tables together to get the answer, sometimes 3 or 4. At first, we didn't have any performance issues, because for testing matters we haven't had added too much data in the database. No that we have a lot of data, simply joining extremely large tables does take a lot of time and for our project which has to be real-time is a disaster.I was wondering how big companies solve these issues.Looks like normalizing tables just adds complexity, but how does the big company handle large amounts of data in their databases, don't they do the normalization? thanks

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  • Best Practices - Data Annotations vs OnChanging in Entity Framework 4

    - by jptacek
    I was wondering what the general recommendation is for Entity Framework in terms of data validation. I am relatively new to EF, but it appears there are two main approaches to data validation. The first is to create a partial class for the model, and then perform data validations and update a rule violation collection of some sort. This is outlined at http://msdn.microsoft.com/en-us/library/cc716747.aspx The other is to use data annotations and then have the annotations perform data validation. Scott Guthrie explains this on his blog at http://weblogs.asp.net/scottgu/archive/2010/01/15/asp-net-mvc-2-model-validation.aspx. I was wondering what the benefits are of one over the other. It seems the data annotations would be the preferred mechanism, especially as you move to RIA Services, but I want to ensure I am not missing something. Of course, nothing precludes using both of them together. Thanks John

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  • CGBitmapContextCreate: unsupported parameter combination

    - by tarmes
    I'm getting this error when creating a bitmap context: CGBitmapContextCreate: unsupported parameter combination: 8 integer bits/component; 24 bits/pixel; 3-component color space; kCGImageAlphaNone; 7936 bytes/row. Here's the code (note that the context is based on the parameters of an existing CGImage: context = CGBitmapContextCreate(NULL, (int)pi.bufferSizeRequired.width, (int)pi.bufferSizeRequired.height, CGImageGetBitsPerComponent(imageRef), 0, CGImageGetColorSpace(imageRef), CGImageGetBitmapInfo(imageRef)); Width is 2626, height is 3981. I've leaving bytesPerRow at zero so that it gets calculated automatically for me, and it's chosen 7936 of its own accord. So, where on Earth is the inconsistency? It's driving me nuts.

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  • Event taps: Varying results with CGEventPost, kCGSessionEventTap, kCGAnnotatedSessionEventTap, CGEve

    - by kevingessner
    I'm running into a thorny problem with posting an event from an event tap. I'm tapping for NSSystemDefined at kCGHIDEventTap, then replacing the event with a new one. The problem I'm running in to is that depending on how I post the event, it's being seen only by some applications. My test applications are Opera, Firefox, Quicksilver, and Xcode. Here are the different techniques I've tried within my event tap callback, with results. I'm expecting an action (the "correct response") from each app; "system beep" means the nothing-is-bound-to-that-key system sound. Create a new event, and return it from the callback. Opera: no response/system beep, Firefox: no response/system beep, Quicksilver: correct response, Xcode: no response/system beep Create a new event, post to kCGSessionEventTap with CGEventPost, return null. Opera: no response/system beep, Firefox: no response/system beep, Quicksilver: correct response, Xcode: no response/system beep Create a new event, post to kCGAnnotatedSessionEventTap with CGEventPost, return null. Opera: correct response, Firefox: correct response, Quicksilver: no response/system beep, Xcode: no response/system beep Create a new event, post with CGEventTapPostEvent, return null. Opera: no response/system beep, Firefox: no response/system beep, Quicksilver: correct response, Xcode: no response/system beep Create a new event, post to kCGSessionEventTap with CGEventPost, and return new event. Opera: no response/system beep, Firefox: no response/system beep, Quicksilver: correct response, Xcode: no response/system beep Create a new event, post to kCGAnnotatedSessionEventTap with CGEventPost, and return new event. Opera: correct response and system beep, Firefox: correct response and system beep, Quicksilver: correct response and system beep, Xcode: no response/double system beep Create a new event, post with CGEventTapPostEvent, and return new event. Opera: no response/system beep, Firefox: no response/system beep, Quicksilver: correct response, Xcode: no response/system beep (6) is the best, but users are complaining about the extra system beep on correct responses, which I'm guessing is coming from the double-posting of the event. I'm not sure of other combinations to try, or where else to look. Can anyone offer any guidance? Is there any way to get the results of both returning the event from my callback and posting to the annotated tap without doing both? Sorry for the lengthy question; I've been doing a lot of experimenting. Thanks in advance Update: this is the code I use to create the event tap: CFMachPortRef eventTap; eventTap = CGEventTapCreate(kCGHIDEventTap, kCGHeadInsertEventTap, 0,CGEventMaskBit(NX_SYSDEFINED) | (1 << kCGEventKeyDown) | (1 << kCGEventKeyUp), myCGEventCallback, (void *)hidEventQueue);

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  • How to enlarge dynamically an UILabel (label and font size)?

    - by Flocked
    Hello, Im currently working on an iPhone project. I want to enlarge dynamically an UILabel in Objective-C like this: How is this possible? I thought I have to do it with CoreAnimation, but I didn't worked. Here is the code I tried: UILabel * fooL = //[…] fooL.frame = CGRectMake(fooL.frame.origin.x, fooL.frame.origin.y, fooL.frame.size.width, fooL.frame.size.height); fooL.font = [UIFont fontWithName:@"Helvetica" size:80]; [UIView beginAnimations:nil context:nil]; [UIView setAnimationCurve:UIViewAnimationCurveEaseIn]; [UIView setAnimationDelegate:self]; [UIView setAnimationDuration:0.5]; [UIView setAnimationBeginsFromCurrentState:YES]; fooL.font = [UIFont fontWithName:@"Helvetica" size:144]; //bigger size fooL.frame = CGRectMake(20 , 44, 728, 167); //bigger frame [UIView commitAnimations]; The problem with this code is that it doesn't change the fontsize dynamically.

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  • Get BSD file descriptor from OSX CoreServices objects.

    - by Inso Reiges
    Hello, I am new to OSX user space development. I've read documentation and googled before asking, but still have no clue about the following. If i am to use CoreServices framework to work with files (FSRef, Forks, URLs, etc.) will i be able to get a raw BSD file descriptor (plain int)? If yes, then how can i do that? The thing is, i want to learn to program with OSX frameworks, but the actual task at hand will require BSD file descriptor later. Inso.

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  • setAnimationRepeatAutoreverses not behaved as I expected

    - by danielkwan
    I am starting to learn to use UIView animation. So I wrote the following lines: [UIView beginAnimations:nil context:NULL]; [UIView setAnimationDuration:2.0]; [UIView setAnimationRepeatCount:2]; [UIView setAnimationRepeatAutoreverses:YES]; CGPoint position = greenView.center; position.y = position.y + 100.0f; position.x = position.x + 100.0f; greenView.center = position; [UIView commitAnimations]; In this case, the UIView (a green box) moved back and fore 2 times. So far so good, BUT I found out that after the moving twice, the green box ended up jumped to the "new position" (position.x + 100.0f, position.y + 100.0f) instead of going back to the original position (position.x, position.y). That makes the animation look pretty odd (like after the box swing back to the original position caused by setAnimationRepeatAutoreverses, it jumps back to the new position in the last microsecond!) What is the best way to make the green box NOT jump to the new position at the very last minute?

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  • NSInvalidArgumentException: Illegal attempt to establish a relationship between objects in different

    - by iPhoneDollaraire
    I have an app based on the CoreDataBooks example that uses an addingManagedObjectContext to add an Ingredient to a Cocktail in order to undo the entire add. The CocktailsDetailViewController in turn calls a BrandPickerViewController to (optionally) set a brand name for a given ingredient. Cocktail, Ingredient and Brand are all NSManagedObjects. Cocktail requires at least one Ingredient (baseLiquor) to be set, so I create it when the Cocktail is created. If I add the Cocktail in CocktailsAddViewController : CocktailsDetailViewController (merging into the Cocktail managed object context on save) without setting baseLiquor.brand, then it works to set the Brand from a picker (also stored in the Cocktails managed context) later from the CocktailsDetailViewController. However, if I try to set baseLiquor.brand in CocktailsAddViewController, I get: Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Illegal attempt to establish a relationship 'brand' between objects in different contexts' From this question I understand that the issue is that Brand is stored in the app's managedObjectContext and the newly added Ingredient and Cocktail are stored in addingManagedObjectContext, and that passing the ObjectID instead would avoid the crash. What I don't get is how to implement the picker generically so that all of the Ingredients (baseLiquor, mixer, garnish, etc.) can be set during the add, as well as one-by-one from the CocktailsDetailViewController after the Cocktail has been created. In other words, following the CoreDataBooks example, where and when would the ObjectID be turned into the NSManagedObject from the parent MOC in both add and edit cases? -IPD UPDATE - Here's the code: - (IBAction)addCocktail:(id)sender { CocktailsAddViewController *addViewController = [[CocktailsAddViewController alloc] init]; addViewController.title = @"Add Cocktail"; addViewController.delegate = self; // Create a new managed object context for the new book -- set its persistent store coordinator to the same as that from the fetched results controller's context. NSManagedObjectContext *addingContext = [[NSManagedObjectContext alloc] init]; self.addingManagedObjectContext = addingContext; [addingContext release]; [addingManagedObjectContext setPersistentStoreCoordinator:[[fetchedResultsController managedObjectContext] persistentStoreCoordinator]]; Cocktail *newCocktail = (Cocktail *)[NSEntityDescription insertNewObjectForEntityForName:@"Cocktail" inManagedObjectContext:self.addingManagedObjectContext]; newCocktail.baseLiquor = (Ingredient *)[NSEntityDescription insertNewObjectForEntityForName:@"Ingredient" inManagedObjectContext:self.addingManagedObjectContext]; newCocktail.mixer = (Ingredient *)[NSEntityDescription insertNewObjectForEntityForName:@"Ingredient" inManagedObjectContext:self.addingManagedObjectContext]; newCocktail.volume = [NSNumber numberWithInt:0]; addViewController.cocktail = newCocktail; UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:addViewController]; [self.navigationController presentModalViewController:navController animated:YES]; [addViewController release]; [navController release]; }

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  • NSPredicate that is the equivalent of SQL's LIKE

    - by randombits
    I'm looking for a way to use NSPredicate to set a LIKE condition to fetch objects. In addition to that, an OR would be useful as well. I'm trying to do something where if a user searches "James" I can write an NSPredicate that will do the equivalent of: select * from users where firstname LIKE '%James%' OR lastname LIKE '%James%';

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