CODEWITHSUNDEEP
iosxcodecore-datauiimage
pjv
pjv

Reputation: 183

Adding images to a database using Core Data

Trying to add an image to a database using core data. A view controller is used for the user to enter text fields and an image to the database. The user selects an image using UIImagePickerController. Code is:

- (void) add
{
NSManagedObjectContext *context = [app managedObjectContext];

Exercises *exercises = [NSEntityDescription insertNewObjectForEntityForName:@"Exercises" inManagedObjectContext:context];

exercises.name = name.text;
exercises.difficulty = difficulty.text;
exercises.type = type.text;
exercises.instructions = instructions.text;
NSData* image1 = [NSData dataWithData:UIImagePNGRepresentation(imageView.image)];
[NSManagedObject setValue:image1 forKey:@"imageView"];

[self dismissViewControllerAnimated:YES completion:nil];

Error is Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key imageView.' What should the key be? Am I even going about this the right way? By the way, saving and retrieving of text works fine. My only issue with adding images.

Upvotes: 0

Views: 978

Answers (2)

satwal
satwal

Reputation: 124

Try saving your image in document directory and add the path of image in the database.

You can access the Image using :

[[UIImageView alloc]initWithImage:[UIImage imageWithData:
    [NSData dataWithContentsOfFile:@"PathStoredInDatabase"]]];

Upvotes: 3

Tommy
Tommy

Reputation: 100622

The call:

[NSManagedObject setValue:image1 forKey:@"imageView"];

attempts to call setValue:forKey: on the class NSManagedObject. That class does not implement that method so it raises an exception.

Probably you wanted to call it on exercises, the instance of NSManagedObject that you've just created — does it have a data attribute called imageView?

In both style and performance terms, the dot notation to access a specific setter is preferred, as you've used for all the other properties, but it's unlikely to be much of a problem compared to the PNG encode it sits next to so I wouldn't worry about it.

Upvotes: 4

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