Question

I am trying to sort an NSMutableArray for that I am using comparer selector;

- (NSComparisonResult)compare:(Product *)someObject {
    return [self.Price compare:someObject.Price];
}

HomeProducts = [HomeProducts sortedArrayUsingSelector:@selector(compare:)];

I want to sort the same array and donot want to assign to other array.

request for member 'Price' in something not a structure or union .... 

its not recognizing self.Price.

Answer 1

Assuming that compare: is in the Product class then you need to use the console to investigate further.

When the exception occurs, what are the values of self and someObject – I bet that one of them is either not a Product or something that’s been released (I think the latter!)

When the crash occurs, you can check the values of self and someObject in the console like this :

po self
po someObject

(or use the gui to the left of the console).

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EDIT Answer to comment :

sortedArrayUsingSelector: returns an NSArray, HomeProducts is an NSMutableArray. Try this instead :

HomeProducts = [[HomeProducts sortedArrayUsingSelector:@selector(compare:)] mutableCopy];