ios - Alamofire参数编码，字典中的字典

Question

想要使用 Swift 将其发送到 Alamofire...

curl -X POST https://content.dropboxapi.com/2/files/download    
 --header "Authorization: Bearer ab-xxx-x-x"     
 --header "Dropbox-API-Arg: {\"path\": "/acme101/acmeX100/acmeX100.001.png\"}"

但是不知道如何将您在此处看到的第二个 --header 获取到代码中？尝试了几次不同的组合，但是......

JSON: 114 bytes Optional("Error in call to API function \"files/download\": Must provide HTTP header \"Dropbox-API-Arg\" or URL parameter \"arg\".")

我提供了它，但显然不正确？

let subPart: NSDictionary = ["path": sourcePath]
let headers:HTTPHeaders = ["Authorization": "Bearer " + token2Save, "Dropbox-API-Arg": String(describing: subPart)]

    Alamofire.request("https://content.dropboxapi.com/2/files/download", method: .post, encoding: JSONEncoding.init(options: []), headers: headers).responseData(completionHandler: {feedback in

Answer 1

Eureka !!谢谢 UB 先生给我这些建议。找到了解决方案。

let subPart: Dictionary =  ["path":sourcePath]
    do {
        let data = try JSONSerialization.data(withJSONObject: subPart, options: [])
        let dataString = String(data: data, encoding: .utf8)
        headers = ["Authorization": "Bearer " + token2Save, "Dropbox-API-Arg": dataString!]
    } catch {
        print("crunch")
    }

 Alamofire.request("https://content.dropboxapi.com/2/files/download", method: .post, encoding: JSONEncoding.init(options: []), headers: headers).responseData(completionHandler: {feedback in
        guard feedback.result.value != nil else {
        print("Error: did not receive data", print("request \(request) feedback \(feedback)"))
        return
        }
        guard feedback.result.error == nil else {
            print("error calling POST on list_folder")
            print(feedback.result.error)
            return
        }
        if let JSON = feedback.result.value {
            print("JSON: \(JSON)")
            let dataString = String(data: JSON, encoding: .utf8)
            print("JSON: \(JSON) \(dataString)")
        }
        if let IMAGE = feedback.result.value {
            sharedDataAccess.fnData(index2seek: 0, fnData:  feedback.result.value! as Data)
            NotificationCenter.default.post(name: Notification.Name("previewPane"), object: nil, userInfo: nil)
        }
    })