I am working on multi part file upload with Alamofire Library in Swift. I need to pass some parameters along with the file. The following is the body I need to pass to the server: 

```
{
  "eventId":7,
  "eventImageList":[
    { "contentType":"png", "imageName":"test", "imagePath":"" }
    ,
    { "contentType":"png", "imageName":"test2", "imagePath":"" }
  ]
}

```

I have tried similar to this:

```
let image = UIImage(named: "sampleImage")

Alamofire.upload(.POST, URL, multipartFormData: {
    multipartFormData in
        if let _image = image {
            if let imageData = UIImageJPEGRepresentation(_image, 0.5) {
                multipartFormData.appendBodyPart(data: imageData, name: "file", fileName: "file.png", mimeType: "image/png")
            }
        }
        for (key, value) in dictionary {
            multipartFormData.appendBodyPart(data: value.dataUsingEncoding(NSUTF8StringEncoding)!, name: key as! String)
        }

    }, encodingCompletion: {
        encodingResult in

        switch encodingResult {
        case .Success(let upload, _, _):
            upload.responseJSON { response in

                switch response.result {
                case .Success:
                     print("jsonResponse ==== ", response)
                case .Failure(let error):
                     print("error ==== ", error)
                }
            }
        case .Failure(let encodingError):
            print(encodingError)
        }
})

```

I need to pass this array:

```
[
  { "contentType":"png", "imageName":"test", "imagePath":"" }
  ,
  { "contentType":"png", "imageName":"test2", "imagePath":"" }
]  

```

but when I decode it like below, the app crashes.

```
multipartFormData.appendBodyPart(data:value.dataUsingEncoding(NSUTF8StringEncoding)!, name: key)

```