ios – 从NSMutableDictionary中删除所有数据

概述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 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

解决方法 这样的事情怎么样：

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"];//make a new dictionary and save it[durationArray addobject:[[NSDictionary alloc] initWithDictionary:lDict]];[lDict removeAllObjects];lDict=nil;

在从可变字典中删除所有对象之前,请创建具有相同内容的新字典并将其保存到数组中.

通过创建新词典,您仍然可以在原始词典中维护键/值对设置,而不仅仅是保存值.

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