Question

使用Mantle在Swift中反序列化和序列化嵌套模型时遇到了很多麻烦。我相信我已经正确设置了所有内容，但我甚至无法解决编译错误。为了给出一些观点，我成功地转换了没有嵌套模型对象的类。这是我的班级：

class TheClass : MTLModel, MTLJSONSerializing
{
    var person:Person?

    static func JSONKeyPathsByPropertyKey() -> [NSObject : AnyObject]!
    {
        return ["person" : "person"]
    }

    static func personJSONTransformer() -> NSValueTransformer!
    {
        return MTLValueTransformer.reversibleTransformerWithForwardBlock(
        { (person:[NSObject : AnyObject]!) -> AnyObject! in
            do
            {
                return MTLJSONAdapter.modelOfClass(Person.self, fromJSONDictionary: person)
            }
            catch
            {
                return Person()
            }
        },
        reverseBlock:
        { (person:Person) -> AnyObject! in
            return MTLJSONAdapter.JSONDictionaryFromModel(person)
        })
    }
}

这段代码无法编译，我无法编译。这是我收到的错误消息：

Cannot convert return expression of type 'AnyObject!' to expected return type 'Person'

我已尝试将反向块的返回类型更改为Person和Person!，但我收到相同的错误消息。我一直在努力解决这个问题很长一段时间，并且在Swift中找不到一个有效的例子，所以任何帮助都会非常感激。

Answer 1

我发现了怎么做！实际上我只需要对我的模型进行反序列化以从JSON中读取它们。我是这样做的：

WARN  2015-07-31 07:22:12,994 [1584] - Association with remote system akka.tcp://SystemName@Server:8081 has failed; address is now gated for 5000 ms. Reason is: [Disassociated]
ERROR 2015-07-31 07:22:12,994 [1584] - Disassociated
Akka.Remote.EndpointDisassociatedException: Disassociated
   at Akka.Remote.EndpointWriter.PublishAndThrow(Exception reason, LogLevel level)
   at Akka.Remote.EndpointWriter.Unhandled(Object message)
   at Akka.Remote.EndpointWriter.Writing(Object message)
   at Akka.Actor.ActorCell.<>c__DisplayClass3e.<Akka.Actor.IUntypedActorContext.Become>b__3d(Object m)
   at Akka.Actor.ActorBase.AroundReceive(Receive receive, Object message)
   at Akka.Actor.ActorCell.ReceiveMessage(Object message)
   at Akka.Actor.ActorCell.AutoReceiveMessage(Envelope envelope)
   at Akka.Actor.ActorCell.Invoke(Envelope envelope)
DEBUG 2015-07-31 07:22:12,996 [1494] - Disassociated [akka.tcp://SystemName@Client:57284] -> akka.tcp://SystemName@Server:8081
DEBUG 2015-07-31 07:23:13,033 [1469] - Drained buffer with maxWriteCount: 50, fullBackoffCount: 1,smallBackoffCount: 0, noBackoffCount: 0,adaptiveBackoff: 10000
ERROR 2015-07-31 07:24:13,019 [1601] - No response from remote. Handshake timed out or transport failure detector triggered.
DEBUG 2015-07-31 07:24:13,020 [1569] - Disassociated [akka.tcp://SystemName@Client:57284] -> akka.tcp://SystemName@Server:8081
WARN  2015-07-31 07:24:13,020 [1601] - Association with remote system akka.tcp://SystemName@Server:8081 has failed; address is now gated for 5000 ms. Reason is: [Disassociated]
ERROR 2015-07-31 07:24:13,021 [1601] - Disassociated

如果您有一组嵌套模型：

class TheClass : MTLModel, MTLJSONSerializing
{
    var person:Person?

    static func JSONKeyPathsByPropertyKey() -> [NSObject : AnyObject]!
    {
        return ["person" : "person"]
    }

    static func personJSONTransformer() -> NSValueTransformer!
    {
        return MTLJSONAdapter.dictionaryTransformerWithModelClass(Person.self)
    }
}

这就是它的全部！

地幔 - 在Swift中转换嵌套模型

1 个答案: