如何将JSON对象解析为元组数组？

Question

在Swift中，是否可以将表示仅包含字符串的JSON对象的String解析为Array个元组[(String, String)]（不是Dictionary<String, String>）？< / p>

我正在编程我的iPhone应用程序，以便将我的服务器的预先签名的回复转发到Amazon S3，这要求客户保留字段的顺序。

这是一个示例JSON字符串，为演示添加了空格：

{
    "policy": "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",
    "x-amz-algorithm": "AWS4-HMAC-SHA256",
    "x-amz-credential": "AKIAIOSFODNN7EXAMPLE/20130721/us-east-1/s3/aws4_request",
    "x-amz-date": "20130721T201207Z",
    "x-amz-signature": "733255ef022bec3f2a8701cd61d4b371f3f28c9f193a1f02279211d48d5193d7"
}

根据Amazon S3: API Reference: Authenticating Requests in Browser-Based Uploads Using POST，我认为可以安全地假设所有字符串都不会包含"，:或空白字符。

所以，我想我的问题是：如何将上面的字符串解析为Array元组[(String, String)]？