结论：NSKeyedArchiver 以健值对＋类名的形式保存数据；

NSDictionary *tDic = @{@"kxxxx":@"hhhh",@"kyyyy":@"pppp",@"keeeek":@"oooo"};

NSMutableData *data = http://www.mamicode.com/[[NSMutableData alloc] init];

    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];

    [archiver encodeObject:tDic forKey:@"keyxxx"];

    [archiver finishEncoding];

bplist00‘"#X$versionX$objectsY$archiverT$top

WNS.keysZNS.objectsV$class£

ÄÄÄ£ÄÄÄÄUkxxxxUkyyyyVkeeeekThhhhTppppToooo“Z$classnameX$classes\NSDictionary¢ !\NSDictionaryXNSObject_NSKeyedArchiver—$%TrootÄ#-27AGNVahlnprvxz|~Ñäëñõ†•∞π?…÷?ÒÙ??

NSKeyedArchiver 类 格式