Crash while uploading image using Alamofire - ios

Question

I'm uploading an image using Alamofire like so..
EDIT: This is the edited code...
for img in images {
let url = "http:my url"
let headers = [
"Accept": "application/json",
"Authorization": self.accessToken
]
if let imageData = (UIImageJPEGRepresentation(img, 0.6)) {
let parameters: [String: String] =
[
"seller_id": "\(self.mySellerId)",
"offline_id": self.prodID,
"is_default": "1",
"sequence": "\(sequenceCount)"
]
Alamofire.upload(multipartFormData: {(multipartFormData) in
let filePath = NSURL(fileURLWithPath: url)
print(imageData)
multipartFormData.append (imageData, withName: "image", fileName: "\(Date().timeIntervalSince1970).jpg", mimeType: "image / jpg")
for (key, value ) in parameters {
print(key,value)
multipartFormData.append(value.data(using: .utf8)!, withName: key)
}
}, to: url, method: .post, headers: headers)
{ (result) in
switch result {
case .success(let upload, _,_ ):
upload.uploadProgress(closure: { (progress) in
UILabel().text = "\((progress.fractionCompleted * 100)) %"
print (progress.fractionCompleted * 100)
})
upload.responseJSON { response in
if let JSON = response.result.value {
print(JSON)
}else{
print("Error")
}
}
case .failure(let encodingError):
print(encodingError)
break
}
}
}
}
In the part for (key, value) in parameters... the for loop goes through all values. But when it reaches the image data part, it crashes saying Could not cast value of type 'Foundation.Data' (0x10787b9f0) to 'Swift.String'
What should be given instead so that the error can be fixed..?

Answer 1

You are casting all values from parameters dictionary as String's, first entry in dictionary is "product_image" and it has imageData as value and that is of type Data.
I would do this, no more force casting.
for (key, value) in parameters {
if let v = value as? String, let valueAsData = v.data(using: .utf8) {
multipartFormData.append(valueAsData, withName: key )
}
}
You could also check if value is already Data type and just add it as well like:
for (key, value) in parameters {
var dataToAppend: Data?
if let data = value as? Data {
dataToAppend = data
} else if let v = value as? String, let valueAsData = v.data(using: .utf8) {
dataToAppend = valueAsData
}
if let d = dataToAppend {
multipartFormData.append(d, withName: key )
}
}