我有以下结构定义：
struct ThreadManager: Equatable {
let fid: Int
let date: NSDate
let forumName: String
let typeid: Int
var page: Int
var threadList: [Thread]
var totalPageNumber: Int?
}
和线程是：
struct Thread: Equatable {
let author: Author
let replyCount: Int
let readCount: Int
let title: String
let tid: Int
let isTopThread: Bool
var attributedStringDictionary: [String: NSAttributedString]
var postDescripiontTimeString: String
var hasRead: Bool
}
如何将ThreadManager变量编码为NSData？我尝试使用以下功能，但不起作用。
func encode<T>(var value: T) -> NSData {
return withUnsafePointer(&value) { p in
NSData(bytes: p, length: sizeofValue(value))
}
}
func decode<T>(data: NSData) -> T {
let pointer = UnsafeMutablePointer<T>.alloc(sizeof(T))
data.getBytes(pointer, length: sizeof(T))
return pointer.move()
}
我有ThreadManager项，我想将它们存储到sqlite中。所以我需要将它们转换为NSData。我有一个名为threadManager的变量，其threadList中的项目数约为70。我运行代码并设置一个断点，并在xcode控制台中输入encode（threadManager），它只有73字节。这是错误的。我如何编码和解码那些结构到NSData。
@GwendalRoué：您是对的，但是我必须根据每个结构构建另一个类。我使用了以下方法，这很丑陋，但是可行。你能帮我改善吗？
init(data: NSData) {
let dictionary = NSKeyedUnarchiver.unarchiveObjectWithData(data) as! NSDictionary
fid = (dictionary["fid"] as! NSNumber).integerValue
date = dictionary["date"] as! NSDate
forumName = dictionary["forumName"] as! String
typeid = (dictionary["typeid"] as! NSNumber).integerValue
page = (dictionary["page"] as! NSNumber).integerValue
totalPageNumber = (dictionary["totalPageNumber"] as? NSNumber)?.integerValue
let threadDataList = dictionary["threadDataList"] as! [NSData]
threadList = threadDataList.map { Thread(data: $0) }
}
extension ThreadManager {
func encode() -> NSData {
let dictionary = NSMutableDictionary()
dictionary.setObject(NSNumber(integer: fid), forKey: "fid")
dictionary.setObject(date, forKey: "date")
dictionary.setObject(forumName, forKey: "forumName")
dictionary.setObject(NSNumber(integer: typeid), forKey: "typeid")
dictionary.setObject(NSNumber(integer: page), forKey: "page")
if totalPageNumber != nil {
dictionary.setObject(NSNumber(integer: totalPageNumber!), forKey: "totalPageNumber")
}
let threadDataList: [NSData] = threadList.map { $0.encode() }
dictionary.setObject(threadDataList, forKey: "threadDataList")
return NSKeyedArchiver.archivedDataWithRootObject(dictionary)
}
}
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