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• renderInContext creating memory that is not promptly released

  - by iworkinprogress

  While debugging in instruments using 'ObjectAlloc' I'm noticing 7megs of memory being allocated for the renderInContext call, but it never is released. When I comment out the renderInContext call this doesn't happen, and future renderInContext calls does not continue to increase the memory allotment. …

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• Can't set default value of string property to "" in the Xcode CoreData model designer

  - by glenc

  I have an entity in my datamodel with a string property that is currently optional, and I'd like to convert this property to a required property with a default value of the empty string. As others have discovered, leaving the default value blank results in validation errors (since the designer…

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• How to properly use CoreData validation & error framework ?

  - by Xav

  I've created a model in Xcode, and for various attributes I have minimum & maximum values defined and that are enforced by coreData at runtime. I'm using NSManagedObject validateValue:forKey:error to check for user input values. I was a bit disappointed to see that the localized error…

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• JSON to Persistent Data Store (CoreData, etc.)

  - by Bryan Veloso

  All of the data on my application is pulled through an API via JSON. The nature of a good percentage of this data is that it doesn't change very often. So to go and make JSON requests to get a list of data that doesn't change much didn't seem all that appealing. I'm looking for the most…

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• Confused by notation?

  - by fuzzygoat

  Would someone be so kind as to explain what is happening with the statement below. I an a bit puzzeled by <MKAnnotation> between id and mp, it not something I have seen before. id <MKAnnotation> mp = [annotationView annotation]; many thanks gary

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• iPhone: How to Maintain Original Image Size Thoughout Image Edits

  - by maddy

  hi, I am developing an iPhone app that resizes and merges images. I want to select two photos of size 1600x1200 from photo library and then merge both into a single image and save that new image back to the photo library. However, I can't get the right size for the merged image. I…

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• Why is the class wrong for NSFetchRequest?

  - by Stephen Furlani

  Hello, I am working with an undocumented API (Osirix) and I have a sister-question to the one I posted here. I am having trouble loading objects from a managed object context. With loading from API, using their instance of _context and _model 2010-05-28 14:05:13.588…

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• iPhone: Animating a view when another view appears/disappears

  - by MacTouch

  I have the following view hierarchy UITabBarController - UINavigationController - UITableViewController When the table view appears (animated) I create a toolbar and add it as subview of the TabBar at the bottom of the page and let it animate in with the…

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• Animating removeFromSuperview

  - by brettr

  I'd like to animate the transition from a subview back to the super view. I display the subview using: [UIView beginAnimations:@"curlup" context:nil]; [UIView setAnimationDelegate:self]; [UIView setAnimationDuration:.5]; [UIView…

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• NSManagedObject - NSSet gets removed ??

  - by aryaxt

  I have an nsmanagedObject this NSManagedObject contains an NSSet. the data for NSSet get's lost when i call release on an NSManagedObject with retain count of 2. Wouldn't retaining an NSManagedObject also retain all it's…

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• Custom UIView using CALayers disappears after 180º rotation or navigation controller pop

  - by Steve Madsen

  I have a created a custom UIView subclass that is exhibiting some strange behavior. It is a spinning wheel selector, and for performance reasons it is drawn entirely into two CALayer instances. The bottom layer is the…

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• Creating a mask from a graphics context

  - by Magic Bullet Dave

  I want to be able to create a greyscale image with no alpha from a png in the app bundle. This works, and I get an image created: // Create graphics context the size of the overlapping rectangle…

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• masking a UIImage

  - by iworkinprogress

  I'm working on an app that can change the borders or a rectangular UIImage. The borders will vary, but will look like the UIImage was cut out with scissors, or something to that affect. What is…

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• JavaScript: Achieving precise animation end values?

  - by bobthabuilda

  I'm currently trying to write my own JavaScript library. I'm in the middle of writing an animation callback, but I'm having trouble getting precise end values, especially when animation duration…

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• How decompose NSPredicate into components?

  - by Victor

  Is there any common way to decompose an expression created by [NSPredicate predicateWithFormat] to objects NSComprasionPredicate, NSExpression and other? For below example need to disassemble…

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• How to create a CGBitmapContext which works for Retina display and not wasting space for regular display?

  - by ????

  Is it true that if it is in UIKit, including drawRect, the HD aspect of Retina display is automatically handled? So does that mean in drawRect, the current graphics context for a 1024 x 768…

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• UICollectionView with one static cell and N dynamic ones from a fetchresultscontroller exception

  - by nflacco

  I'm trying to make a UITableView that shows a blog post and comments for that post. My setup is a tableview in storyboard with two dynamic prototype cells. The first cell is for the post and…

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• Malloc to a CGPoint Pointer throwing EXC_BAD_ACCESS when accessing

  - by kdbdallas

  I am trying to use a snippet of code from a Apple programming guide, and I am getting a EXC_BAD_ACCESS when trying to pass a pointer to a function, right after doing a malloc. (For…

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• iPhone OS: Is there a way to set up KVO between two ManagedObject Entities?

  - by nickthedude

  I have 2 entities I want to link with KVO, one a single statTracker class that keeps track of different stats and the other an achievement class that contains information about…

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• UIDisplayLink stops updating when UIScrollView scrolled

  - by Tricky

  Title is quite self explanatory, but I have some animation being done in a loop triggered by UIDisplayLink. However, as soon as I scroll a UIScrollView I have added to my view…

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• Importing large datasets on iPhone using CoreData

  - by Matthes

  Hi there, I'm facing very annoying problem. My iPhone app is loading it's data from a network server. Data are sent as plist and when parsed, it neeeds to be stored to SQLite…

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• How to- NSAttributedString to CGImageRef

  - by kroko

  Hello! I'm writing a QuickLook plugin. Well, everything works. Just want to try it make better ;). Thus the question. Here is a function that returns thumbnail image and that…

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• Retrieve the CAKeyframeAnimationKey's key in AnimationDidStop

  - by JacktheSparrow

  I have multiple CAKeyframeAnimation objects, each with a unique key like the following: ..... [myAnimation setValues:images]; [myAnimation setDuration:1]; .... [myLayer…

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• iPhone OS: Why is my managedModelObject not complying with Key Value Coding?

  - by nickthedude

  Ok so I'm trying to build this stat tracker for my app and I have built a data model object called statTracker that keeps track of all the stuff I want it to. I can set and…

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• How to deal with many to many relationships with NSFetchedResultsController?

  - by Phil Yates

  OK so I have two entities in my data model (let's say entityA and entityB), both of these entities have a to-many relationship to each other. I have setup a…

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