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有没有办法在iOS中获得一组CLLocationsCoordinate2D的中心坐标？

也许这是一个非常普遍和神经质的问题.我有一个NSMutableDictionary我要添加一些对象,然后将字典添加到NSMutableArray.将字典添加到数组后,我将删除字典的所有对象并将其设置为nil,这是从我添加字典的数组中删除数据.我正在做什么错误导致数组丢失数据？

NSMutableDictionary *lDict = [[NSMutableDictionary alloc]init];
[lDict setObject:lDate forKey:@"date"];
[lDict setObject:presentationId forKey:@"pptId"];
[lDict setObject:presentationName forKey:@"PresentationName"];
[lDict setObject:presentationDesc forKey:@"PresentationDesc"];
[lDict setObject:presentationThumb forKey:@"presentationThumb"];
[lDict setObject:postCallRowId forKey:@"postCallId"];
[lDict setObject:userReaction forKey:@"userReaction"];
[lDict setObject:appDel.gRegion forKey:@"Region"];
[lDict setObject:@"Presentation" forKey:@"ContentType"];

[durationArray addObject:lDict];

 //here I am having data in array

[lDict removeAllObjects];
lDict=nil;

//here I lost data in array also