如何使用字符串数组将结构转换为NSData，反之亦然Swift

我有这个结构：

struct MessageRandomWords { let message = MessageType.kMessageTypeRandomWords let randomWords : Array<Array> } 

我试图通过这样做将此结构转换为NSDate：

  var message = MessageRandomWords(randomWords: self.words) let data = NSData(bytes: &message, length: sizeof(MessageRandomWords)) 

但是，当我试图将其转换回原始结构时：

 var messageRandomWords : MessageRandomWords? data.getBytes(&messageRandomWords, length: sizeof(MessageRandomWords)) if let messageRandomWords = messageRandomWords { } 

我在if let语句中得到了一个BAD_ACCESS 。 哪里有问题？

Answer 1

基于这个答案： Swift结构化到NSData并且我写了这个解决方案：

 struct MessageRandomWords { let message = MessageType.kMessageTypeRandomWords var data : NSData? var name: String struct ArchivedPacket { let message = MessageType.kMessageTypeRandomWords var dataLength : Int64 var nameLength : Int64 } func archive() -> NSData { var archivedPack = ArchivedPacket(dataLength: Int64(self.data!.length), nameLength: Int64(self.name.lengthOfBytesUsingEncoding(NSUTF8StringEncoding))) var metaData = NSData(bytes: &archivedPack, length: sizeof(ArchivedPacket)) let archiveData = NSMutableData(data: metaData) archiveData.appendData(name.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)!) archiveData.appendData(data!) return archiveData } static func unarchive(data : NSData!) -> MessageRandomWords { var archivedPacket = ArchivedPacket(dataLength: 0, nameLength: 0) let archivedStructLength = sizeof(ArchivedPacket) //lenght of the struct //Get the data tha will form our archived Packet let archivedData = data.subdataWithRange(NSMakeRange(0, archivedStructLength)) //save the data taht form the archivedPacket inside the archivedPacket archivedData.getBytes(&archivedPacket, length: archivedStructLength) //get the range of data that contains the name let nameRange = NSMakeRange(archivedStructLength, Int(archivedPacket.nameLength)) //get the range of the data that contains the data let dataRange = NSMakeRange(archivedStructLength + Int(archivedPacket.nameLength), Int(archivedPacket.dataLength)) //get the data that rappresent the name let nameData = data.subdataWithRange(nameRange) //Get the name frome the data let name = NSString(data: nameData, encoding: NSUTF8StringEncoding) as! String // Geth the data let theData = data.subdataWithRange(dataRange) //Create the struct let messageRndm = MessageRandomWords(data: theData, name: name) return messageRndm } } 

如果您创建了如图所示的结构，您可以通过将其编码为NSData来发送您的字符串数组，然后在接收时对其进行解码。

您可以在GitHub上找到完整的工作示例

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