Question

Help please 🙂

I have set up a mutable array as follows

- (void)viewDidLoad {
[super viewDidLoad];


NSFetchRequest *request = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"TopImage"  inManagedObjectContext:managedObjectContext];
[request setEntity:entity];


NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"topImage" ascending:YES];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil];
[request setSortDescriptors:sortDescriptors];
[sortDescriptor release];
[sortDescriptors release];


NSError *error = nil;
NSMutableArray *mutableFetchResultsT = [[managedObjectContext executeFetchRequest:request error:&error] mutableCopy];
if (mutableFetchResultsT == nil) {
}

[self setTopImageArray:mutableFetchResultsT];}

And im trying to populate a UIImageView using :

- (void)showPhoto:(NSInteger)numberToAdd
{

[topIV setImage:[topImageArray objectAtIndex:currentPI + numberToAdd]];

}

currentPI is an integer marking current image in index and number to add is set here:

- (IBAction)nextTouch
{
[self showPhoto:-1];

}

This will skip to next image (thankyou to @XenElement for this insight).

No images load in UIImageView at all.

MutableArray is getting populated through imagePickerController.

The following is my dedicated Image>Data Data>Image converter class

@implementation Image2Data

+ (BOOL)allowsReverseTransformation {
return YES;
}

+ (Class)transformedValueClass {
return [NSData class];
}

- (id)transformedValue:(id)value {
return UIImagePNGRepresentation(value);
}

- (id)reverseTransformedValue:(id)value {
return [[[UIImage alloc] initWithData:value] autorelease];
}

@end

This is initialized in my managed objects class with:

+ (void)initialize {
if (self == [Images class]) {
    Image2Data *transformer = [[Image2Data alloc] init];
    [NSValueTransformer setValueTransformer:transformer forName:@"Image2Data"];
}
 }

Thank you in advance for any suggestions

DetartrateD

I had originally put:

[topImageArray insertObject:imageS atIndex:0];

corrected to:

[topImageArray insertObject:imageS.topImage atIndex:0];

:)))) big laugh, I was pointing to my entity not its attribute ahh well, lesson learned!

Answer 1

It is unlikely that you are storing the image as a UIImage object. You must be converting it into a NSData object before storing it. You must convert it back to a UIImage object using initWithData: prior to setting it to the UIImageView instance.