从 NSMutableDictionary 到字符串数组的 Alamofire 结果：Anyobject答案

【问题标题】：Alamofire result from NSMutableDictionary to Array of String : Anyobject从 NSMutableDictionary 到字符串数组的 Alamofire 结果：Anyobject
【发布时间】：2015-10-08 04:22:25
【问题描述】：

我正在通过 alamofire 发出请求，并收到此响应：

{
success: true,
data: [
{
_id: "5615dd59e4b0d2d408b385ff",
name: "Exam Prep",
info: "Tools designed to increase students' performance on standardized tests",
active: true
},
{
_id: "5615dd75e4b0d2d408b38603",
name: "Mathematics",
info: "The study of topics such as quantity numbers, structure, space, and change",
active: true
},
{
_id: "5615dd8de4b0d2d408b38604",
name: "Science",
info: "Knowledge in the form of predictions about the universe",
active: true
},
{
_id: "5615dda5e4b0d2d408b38605",
name: "Language Arts",
info: "The study of languages, composition, and grammar",
active: true
}
]
}

使用通用对象序列化作为模板形成 Alamofire 的文档：http://cocoadocs.org/docsets/Alamofire/2.0.2/ 我的主题类具有以下方法：

static func collection(response response: NSHTTPURLResponse, representation: AnyObject) -> [Subject] {
    var subjects: [Subject] = []

    if let representation = representation as? [[String: AnyObject]] {
        for subjectRepresentation in representation {
            if let subject = Subject(response: response, representation: subjectRepresentation) {
                subjects.append(subject)
            }
        }
    }

    return subjects
}

但是 if let representation = representation as 的演员表？ [[String: AnyObject]] 总是失败。我相信这与“数据”而不是根级别对象中的 json 数据有关，但我不知道如何告诉演员拉出“数据”元素以创建 Subject 类的实例。帮忙？

【问题讨论】：

标签： swift nsmutabledictionary alamofire

【解决方案1】：

您可以使用valueForKeyPath 拉出data 元素：

static func collection(response response: NSHTTPURLResponse, representation: AnyObject) -> [Subject] {
var subjects: [Subject] = []

if let representation = representation.valueForKeyPath("data") as? [[String: AnyObject]] {
    for subjectRepresentation in representation {
        if let subject = Subject(response: response, representation: subjectRepresentation) {
            subjects.append(subject)
        }
    }
}

return subjects
}

【讨论】：

【解决方案2】：

将representation 转换为[String: AnyObject]

let representation = representation as? [String: AnyObject]

【讨论】：