SIGABRT on NSDictionary objectAtIndex: unrecognized selector - objective-c

Question

I'm having a weird error here.
I have an array named __ImageData:
static NSArray *__ImageData = nil;
NSString *path = [[NSBundle mainBundle] pathForResource:#"ImageData" ofType:#"plist"];
NSData *plistData = [NSData dataWithContentsOfFile:path];
NSString *error; NSPropertyListFormat format;
_ImageData = [NSPropertyListSerialization propertyListFromData:plistData
mutabilityOption:NSPropertyListImmutable
format:&format
errorDescription:&error];
When I NSLog out the content of the array, I get this output:
2012-08-23 16:36:35.573 CAT[28814:c07] {
"Item 0" = {
height = 7121;
name = Map1;
width = 8556;
};
"Item 1" = {
height = 7121;
name = Map2;
width = 8556;
};
"Item 2" = {
height = 7121;
name = Map3;
width = 8556;
};
}
But when I NSLog out NSLog(#"%#", [__ImageData objectAtIndex:0]);, I get this exception:
2012-08-23 16:36:35.573 CAT[28814:c07] -[__NSCFDictionary objectAtIndex:]:
unrecognized selector sent to instance 0x719d0f0
2012-08-23 16:36:35.574 CAT[28814:c07] *** Terminating app due to uncaught exception
'NSInvalidArgumentException', reason: '-[__NSCFDictionary objectAtIndex:]:
unrecognized selector sent to instance 0x719d0f0'
*** First throw call stack:
etc..
I have no idea how to reach an object in this array.. It seemes like the objectAtIndex cant find any indexes, not even index:0, even though there is data inside.. Anyone know how to get it?
I am using the PhotoScroller-template from Apple, using the CATiledLayer. I think the whole thing is kinda funky, but everybody says we should use this for large images. Anyone have an explanation or a better idea than CATiledLayer for huge images? (8556*7121px).
And why do I get Dictionary-error from the NSArray?
When doing NSDictionary *dict = [__ImageData objectAtIndex:0], I also get the same exception.
Stian.

Answer 1

_ImageData is not an array, it is a dictionary. To display the first element of the dictionary you could do something like:
NSLog(#"%#", [_ImageData objectForKey:#"Item 0"]);

Answer 2

I ran into this same issue using an JSON Array. My fix was to convert it to an NSDictionary like so:
[(NSDictionary *)json objectForKey:#"detail"];
Or you could do it like this:
NSDictionary *dict = (NSDictionary *)array;