Core data images from desktop to iphone

Question

I built a simple mac data entry tool I use with an iPhone application. I\'ve recently added thumbnail which I added via an Image Well using simple bindings. Its a transforma

Answer 1

Sounds like you are storing the image as an NSImage on the desktop and that object does not exist on the iPhone. Your desktop app needs to store the image in something that is portable, a PNG or JPG, etc. Then you will be able to load it back into your iPhone application as a UIImage.

Update re transformable

Sounds like you are still passing in a NSImage to the attribute and it is thinking you are handling it data. You need to convert it to a "standard" format first, like this:

NSBitmapImageRep *bits = [[myImage representations] objectAtIndex: 0];

NSData *data = [bits representationUsingType:NSPNGFileType properties:nil];
[myManagedObject setImage:data];

I recommend writing custom accessors to handle this, like the following:

#ifdef IPHONEOS_DEPLOYMENT_TARGET

- (void)setImage:(UIImage*)image
{
  [self willChangeValueForKey:@"image"];

  NSData *data = UIImagePNGRepresentation(image);
  [myManagedObject setImage:data];
  [self setPrimitiveValue:data forKey:@"image"];
  [self didChangeValueForKey:@"image"];
}

- (UIImage*)image
{
  [self willAccessValueForKey:@"image"];
  UIImage *image = [UIImage imageWithData:[self primitiveValueForKey:@"image"];
  [self didAccessValueForKey:@"image"];
  return image;
}

#else

- (void)setImage:(NSImage*)image
{
  [self willChangeValueForKey:@"image"];
  NSBitmapImageRep *bits = [[image representations] objectAtIndex: 0];

  NSData *data = [bits representationUsingType:NSPNGFileType properties:nil];
  [myManagedObject setImage:data];
  [self setPrimitiveValue:data forKey:@"image"];
  [self didChangeValueForKey:@"image"];
}

- (NSImage*)image
{
  [self willAccessValueForKey:@"image"];
  NSImage *image = [[NSImage alloc] initWithData:[self primitiveValueForKey:@"image"]];
  [self didAccessValueForKey:@"image"];
  return [image autorelease];
}

#endif

This will give you a conditional compile and will store the data as NSData (in PNG format) that can be retrieved on any device.