ios - XCode 7/Swift 2 的字典类型速记语法错误

Question

XCode 7/Swift 2 在此代码上吐出一堆错误，这些错误基于 Alamofire readme 中的片段。 .我对 Swift 或 iOS 开发一无所知，所以任何指点都将不胜感激。

import Foundation
import Alamofire

enum PTVRouter: URLRequestConvertible {
    static let baseUrl = "http://timetableapi.ptv.vic.gov.au/"
    static let devId = "__CENSORED__"
    static let devKey = "__CENSORED__"

    case HealthCheck()

    var URLRequest: NSURLRequest {
        let (path: String, parameters: [String: AnyObject]?) = {
            switch self {
            case .HealthCheck():
                return ("/v2/healthcheck", ["devId": PTVRouter.devId])
            }
        }()

        let URL = NSURL(string: PTVRouter.baseUrl)!
        let URLRequest = NSURLRequest(URL: URL.URLByAppendingPathComponent(path))
        let encoding = Alamofire.ParameterEncoding.URL

        return encoding.encode(URLRequest, parameters: parameters).0
    }
}

Answer 1

您不能就地指定元组 (path, parameters) 的类型。您必须在其他地方指定类型:

在闭包的开头:

let (path, parameters) = {() -> (String, [String:AnyObject]?) in
    switch self {
    case .HealthCheck():
        return ("/v2/healthcheck", ["devId": PTVRouter.devId])
    }
}()

或作为名称后的元组类型:

let (path, parameters) : (String, [String:AnyObject]?) = {
    switch self {
    case .HealthCheck():
        return ("/v2/healthcheck", ["devId": PTVRouter.devId])
    }
}()

请注意，在我看来，语法真的非常丑陋，并且在很大程度上混淆了代码的实际工作。