Loading image from CoreData at cellForRowAtIndexPath slows down scrolling

Question

I am working on a UITableView that is very much like the iOS\'s native Photo app: it has many rows with 4 image thumbnails in each row. (i.e. each UITableViewCell has 4 UIIm

Answer 1

Add a subClass of NSValueTransformer for image in core data,

Code like follows:

+ (BOOL)allowsReverseTransformation {
    return YES;
}
+ (Class)transformedValueClass {
    return [NSData class];
}
 - (id)transformedValue:(id)value {
    return UIImageJPEGRepresentation(value, 0.5);
 }
- (id)reverseTransformedValue:(id)value {
    return [[UIImage alloc] initWithData:value];
}