ios - 类型 'X' 不符合协议(protocol) 'ResponseObjectSerializable'

Question

我尝试使用 Alamofire 进行自定义响应序列化

我按照 README 中的内容创建协议(protocol)和扩展

@objc public protocol ResponseObjectSerializable {
    init?(response: NSHTTPURLResponse, representation: AnyObject)
}

extension Alamofire.Request {
    public func responseObject<T: ResponseObjectSerializable>(completionHandler: (NSURLRequest, NSHTTPURLResponse?, T?, NSError?) -> Void) -> Self {
        let serializer: Serializer = { (request, response, data) in
            let JSONSerializer = Request.JSONResponseSerializer(options: .AllowFragments)
            let (JSON: AnyObject?, serializationError) = JSONSerializer(request, response, data)
            if response != nil && JSON != nil {
                return (T(response: response!, representation: JSON!), nil)
            } else {
                return (nil, serializationError)
            }
        }

        return response(serializer: serializer, completionHandler: { (request, response, object, error) in
            completionHandler(request, response, object as? T, error)
        })
    }
}

但是当我尝试符合它时，我得到了这个错误 Type 'my_model_class' does not conform to protocol 'ResponseObjectSerializable'

我的模型只是一个简单的类

final class Shot: ResponseObjectSerializable {
    required init?(response: NSHTTPURLResponse, representation: AnyObject) {
    }
}

将其与 Xcode 6.3 一起使用，有人遇到过吗？并知道如何进行这项工作？

回应到@airspeed 错误消失了，但让我困惑的是在 Apple Swift 文档中他们有一个关于 @objc 协议(protocol)的例子和符合它的 swift 类不需要 @objc

@objc protocol CounterDataSource {
    optional func incrementForCount(count: Int) -> Int
    optional var fixedIncrement: Int { get }
}

class TowardsZeroSource: CounterDataSource {
    func incrementForCount(count: Int) -> Int {
        if count == 0 {
            return 0
        } else if count < 0 {
            return 1
        } else {
            return -1
        }
    }
}

Answer 1

Shot 未标记为 @objc，与协议(protocol)不同，因此您的 init 不符合要求:

@objc public protocol ResponseObjectSerializable {
    init?(response: NSHTTPURLResponse, representation: AnyObject)
}

final class Shot: ResponseObjectSerializable {
    @objc required init?(response: NSHTTPURLResponse, representation: AnyObject) {
    }
}

导致错误:

note: protocol requires initializer init(response:representation:) with type (response: NSHTTPURLResponse, representation: AnyObject)

  init?(response: NSHTTPURLResponse, representation: AnyObject)`
  ^

note: candidate is not @objc, but protocol requires it

在 Shot 的定义前加上一个 @objc，它应该可以编译。