Alamofire AFError when work with Flickr API - ios

Question

I am using Alamofire to get JSON data from flickr API.
Here if the function, which prepares an array of URLs from the response:
func urlTolinkslist (tag: String) {
print (viewSearchBar.text)
let url = "https://api.flickr.com/services/feeds/photos_public.gne?tags=\(tag.replacingOccurrences(of: " ", with: "%20"))&format=json&nojsoncallback=1"
Alamofire.request(url).validate().responseJSON { response in
switch response.result {
case .success(let value):
let json = JSON(value)
let items = json["items"]
self.linksList = []
for i in 0..<items.count {
let item = items[i]
let media = item["media"]
var link = String(describing: media["m"])
self.linksList.append(link)
}
print("count: \(self.linksList.count)")
self.viewCollectionView.reloadData()
case .failure(let error):
print(error)
}
}
}
"tag" in the API URL is the parameter I get from a search bar. In most of the cases it works fine, but in some cases I get:
[Result]: FAILURE: responseSerializationFailed(Alamofire.AFError.ResponseSerializationFailureReason.jsonSerializationFailed(Error Domain=NSCocoaErrorDomain Code=3840 "Invalid escape sequence around character 1029." UserInfo={NSDebugDescription=Invalid escape sequence around character 1029.}))
I think there may be some extra characters, but I don't know how to fix it.

Answer 1

Let Alamofire encode for you the parameters:
func urlTolinkslist (tag: String) {
let url = "https://api.flickr.com/services/feeds/photos_public.gne"
var dict = [String:AnyObject]()
dict["tags"] = tag
dict["format"] = "json"
dict["nojsoncallback"] = 1
Alamofire.request(.GET, url, parameters: dict, encoding: .URLEncodedInURL, headers: nil).validate().responseJSON { response in
switch response.result {
case .success(let value):
let json = JSON(value)
let items = json["items"]
self.linksList = []
for i in 0..<items.count {
let item = items[i]
let media = item["media"]
var link = String(describing: media["m"])
self.linksList.append(link)
}
print("count: \(self.linksList.count)")
self.viewCollectionView.reloadData()
case .failure(let error):
print(error)
}
}
}