xcode may not respond to warning - xcode

Question

Can't seem to get rid of a warning. The warning is:
'UIImage' may not respond to '-scaleToSize'
above the #implmentation MyViewController I have this #implementation:
#implementation UIImage (scale)
-(UIImage*)scaleToSize:(CGSize)size
{
UIGraphicsBeginImageContext(size);
[self drawInRect:CGRectMake(0, 0, size.width, size.height)];
UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return scaledImage;
}
#end
Then I have MyViewController implementation
#implementation TodayNewsTableViewController
#synthesize dataList;
......
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *MainNewsCellIdentifier = #"MainNewsCellIdentifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier: MainNewsCellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier: MainNewsCellIdentifier] autorelease];
}
NSUInteger row = [indexPath row];
NSDictionary *stream = (NSDictionary *) [dataList objectAtIndex:row];
NSString *title = [stream valueForKey:#"title"];
if( ! [title isKindOfClass:[NSString class]] )
{
cell.textLabel.text = #"";
}
else
{
cell.textLabel.text = title;
}
cell.textLabel.numberOfLines = 2;
cell.textLabel.font =[UIFont systemFontOfSize:10];
cell.detailTextLabel.numberOfLines = 1;
cell.detailTextLabel.font= [UIFont systemFontOfSize:8];
cell.detailTextLabel.text = [stream valueForKey:#"created"];
NSString *i = [NSString stringWithFormat:#"http://www.mywebsite.co.uk/images/%#", [stream valueForKey:#"image"]];
NSData *imageURL = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:i]];
UIImage *newsImage = [[UIImage alloc] initWithData:imageURL] ;
UIImage *scaledImage = [newsImage scaleToSize:CGSizeMake(50.0f, 50.0f)]; // warning is appearing here.
cell.imageView.image = scaledImage;
[imageURL release];
[newsImage release];
return cell;
}
Thanks for your time in advance.
Frames

Answer 1

To avoid this warning compiler must "see" your custom method declaration. So you should put
#interface UIImage (scale)
-(UIImage*)scaleToSize:(CGSize)size
#end
somewhere - either to corresponding header file, or in the same implementation file if you do not want this method to be accessible outside current file.