Cast dictionary as object in swift (ios) - ios

Question

I have this function searchMoviesOnJson:
func searchMoviesOnJson(imdbTitle: String, completionHandler: #escaping (Dictionary<String, Any>?) -> ()) {
let urlByName: String = "https://www.omdbapi.com/?s=\(imdbTitle)&type=movie"
//returns a list of movies that contains the title searched
//------------------------------------------------
Alamofire.request(urlByName).responseJSON {
response in
switch response.result {
case .success(let value):
let moviesJSON = value
completionHandler(moviesJSON as? Dictionary<String, Any>)
case .failure(_):
completionHandler(nil)
}
}
//------------------------------------------------
}
That gives me this response from api (e.g.: imdbTitle = "arq"):
{
Response = True;
Search = (
{
Poster = "https://images-na.ssl-images-amazon.com/images/M/MV5BMjAxODQ2MzkyMV5BMl5BanBnXkFtZTgwNjU3MTE5OTE#._V1_SX300.jpg";
Title = ARQ;
Type = movie;
Year = 2016;
imdbID = tt5640450;
},
{
Poster = "N/A";
Title = Arq;
Type = movie;
Year = 2011;
imdbID = tt2141601;
},
{
Poster = "N/A";
Title = "A.R.Q.";
Type = movie;
Year = 2015;
imdbID = tt3829612;
}
);
totalResults = 3;
}
So I created a this class MovieByTitle
class MovieByTitle {
var poster : String?
var title : String?
var year : Int?
var imdbID : String?
init(poster: String?, title: String?, year: Int?, imdbID: String?) {
//validation
if let isPoster = poster { self.poster = isPoster }
else { self.poster = nil }
if let isTitle = title { self.title = isTitle }
else { self.title = nil }
if let isYear = year { self.year = isYear }
else { self.year = nil }
if let isImdbID = imdbID { self.imdbID = isImdbID }
else { self.imdbID = nil }
}
}
And now my doubt, I also create this MovieDAO:
class MovieDao {
func getMovies(imdbTitle: String, completionHandler: #escaping (([MovieByTitle]) -> ())) {
//function that conects to the api
searchMoviesOnJson(imdbTitle: imdbTitle, completionHandler: {
moviesJSON in
//array to keep the attributes received by the dictionary
var moviesArray = [MovieByTitle]()
//searchResults is the response from my request as an array
if let searchResults = moviesJSON?["Search"] as? NSArray{
for searchResult in searchResults {
let movieResult = searchResult as! Dictionary<String,Any>
let movieDetail = MovieByTitle()
movieDetail.poster = movieResult["Poster"] as? String
movieDetail.title = movieResult["Title"] as? String
movieDetail.year = movieResult["Year"] as? Int
movieDetail.imdbID = movieResult["imdbID"] as? String
moviesArray.append(movieDetail)
}
}
})
}
}
But the xcode returns an error in line:
let movieDetail = MovieByTitle()
Error message: missing argument for parameter 'poster' in call (and so on with the others)
What is the right sintax for that? What is the better way to cast my dictionary response as an object?

Answer 1

You MovieByTitle init function requires 4 parameters that are missing.
Solution 1: Add a secondary init:
init() {}
Solution 2: Define existing init parameters as optional by giving them default values:
init(poster: String? = nil, title: String? = nil, year: Int? = nil, imdbID: String? = nil)
Solution 3: Call the existing init with the parameters it needs:
let movieDetail = MovieByTitle(poster: movieResult["Poster"] as? String, title: movieResult["Title"] as? String, year: movieResult["Year"] as? Int, imdbID: movieResult["imdbID"] as? String)

Answer 2

Your init function requires 4 parameters. You haven't included any. Try the following
let poster = movieResult["Poster"] as? String
let title = movieResult["Title"] as? String
let year = movieResult["Year"] as? Int
let imdbID = movieResult["imdbID"] as? String
let movieDetail = MovieByTitle(poster:poster, title:title, year:year, imdbID:imdbDB)