如何使用 PromiseKit 6.3 返回 Promise<JSON>答案

【问题标题】：How To Use PromiseKit 6.3 To Return Promise<JSON>如何使用 PromiseKit 6.3 返回 Promise<JSON>
【发布时间】：2018-06-19 20:48:59
【问题描述】：

我在从 PromiseKit 4.0 转换到 PromiseKit 6.3 时遇到问题。我正在尝试将此特定功能转换为新版本。我该怎么做？

func registerUser(_ email: String, givenName: String, familyName: String, password: String) -> Promise<JSON> {
        let req = urlRequestForPath("/user/create/local/", parameters: nil, method: .POST) as! NSMutableURLRequest
        let queryString = stringFromParameters(["email": email.lowercased() as AnyObject, "given_name": givenName as AnyObject, "family_name": familyName as AnyObject, "password": password as AnyObject, "client_id": oauthClientId as AnyObject])

    req.httpBody = queryString.data(using: String.Encoding.utf8, allowLossyConversion: false)

    return URLSession.shared.dataTask(with: req as URLRequest).then{(data: Data) -> JSON in
        return try! JSON(data: data)
    }
}

【问题讨论】：

标签： ios swift promisekit

【解决方案1】：

它应该返回如下，

func registerUser(_ email: String, givenName: String, familyName: String, password: String) -> Promise<JSON> {
    let req = urlRequestForPath("/user/create/local/", parameters: nil, method: .POST) as! NSMutableURLRequest
    let queryString = stringFromParameters(["email": email.lowercased() as AnyObject, "given_name": givenName as AnyObject, "family_name": familyName as AnyObject, "password": password as AnyObject, "client_id": oauthClientId as AnyObject])

    req.httpBody = queryString.data(using: String.Encoding.utf8, allowLossyConversion: false)

    let p = URLSession.shared.dataTask(.promise, with: req.pmkRequest)

    return p.then { (data, response) -> Promise<JSON> in
        let json = try! JSON(data: data)
        return Promise.value(json)
    }
}

【讨论】：