You can use
NSString *imageFinalNames = @"car1389188719-1224596-22.jpg,car1389188659-1224536-22.jpg,car1389188311-1224187-22.jpg,car1389187911-1223788-22.jpg,";
NSArray *array = [testString componentsSeparatedByString:@","];
In this array you will find all words. Careful: you have at end a comma and you will have in the array a last item that won't contain anything.