value stored to value2 during its initialization is never read

警告：value stored to value2 during its initialization is never read

NSMutableArray *datesArray = [[NSMutableArray alloc]init];
 datesArray = [_onDemandDictionary objectForKey:key];

出现了stored to 'datesArray' during its initialization is never read改成NSMutableArray *datesArray = nil;
 datesArray = [_onDemandDictionary objectForKey:key];

I would take this line out, You shouldn't need to initialize it.

//NSArray *myKeyArray = [[NSArray alloc]init];

Change this to

NSArray*myKeyArray;

You only need to allocate it if it is mutable.