Baffled at trying to set cell.image using UIImage: imageNamed:

Question

I created a plist that contains an NSDictionary structure. The key is a label (which I use to populate tableview cell.text) and the value is a file name that I want to use to 'dynamically' populate cell.image. The exact png filenames are loaded into the project.

To make things easier (so I thought), I load the plist into an NSDictionary, then pull that apart into two arrays (using allKeys and allValues).

In attempting to set a cell image, I dont understand why this works:

cell.image = [UIImage imageNamed:@"bad.png"];

and this does not (in simulator - I get an app crash and barfing in debugger):

cell.image = [UIImage imageNamed:[rowImageList objectAtIndex:indexPath.row]];

I can put this next line right before the second piece of code and it works just fine, so it appears that I am getting an NSString from objectAtIndex:

NSLog(@"Image name: %@", [rowImageList objectAtIndex:indexPath.row]);

I have also tried creating a temp NSString and assigning [rowImageList objectAtIndex:] to it, then using that NSString to supply imageNamed:.

Here is some info from debugger:

-[NSCFArray length]: unrecognized selector sent to instance 0x262d910

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSCFArray length]: unrecognized selector sent to instance 0x262d910'

Let me know if you need more info/code.

Edit: Here's how I populate rowImageList:

NSArray *myRowImages = [[NSArray alloc] init]; 
myRowImages = [searchFilterList allValues]; 
self.rowImageList = [myRowImages copy]; 
[myRowImages release]; 
//where searchFilterList is an NSDictionary that I loaded from a plist

Here's a screenshot of my plist: [IMG][]1 [/IMG]

Edit: revised rowImageList population:

 NSMutableArray *myRowImages = [[NSMutableArray alloc] init];
 NSEnumerator *enumerator = [searchFilterList objectEnumerator];
 id object;

 while ((object = [enumerator nextObject])) {
     [myRowImages addObject:[object objectAtIndex:0]];
 }
 self.rowImageList = myRowImages; //edit: added self. prefix
 [myRowImages release];

Answer 1

I would double-check the output from NSLog() and make sure it's not an array that contains an NSString. That's what the error is telling you; you're passing an NSArray where an NSString is expected.

Answer 2

This error means that [rowImageList objectAtIndex:indexPath.row] is returning an array and not a string as expected.

The reason why a value is printed is because to print an array also you need to specify %@ in the NSLog statement.

Try debugging the method and check the class of [rowImageList objectAtIndex:indexPath.row]. It will most probably turn out to be an array.

Answer 3

Are you sure your plist is key/string pairs, and you have not somehow wrapped the names in an array?