How to access values of custom objects in an array? - ios

Question

I currently have a custom object
public struct GenreData : Decodable {
public let id : NSNumber?
public let name : String
public init?(json: JSON) {
guard let name : String = "name" <~~ json
else {return nil}
self.id = "id" <~~ json
self.name = name
}
}
I have an array of the custom object and am trying to access the 'id' part of the object so I can plug it in another function :
var genreDataArray: [GenreData] = []
var posterStringArray: [String] = []
var posterImageArray: [UIImage] = []
GenreData.updateAllData(urlExtension:"list", completionHandler: { results in
guard let results = results else {
print("There was an error retrieving info")
return
}
self.genreDataArray = results
for _ in self.genreDataArray {
if let movieGenreID = self.genreDataArray[0].id {//This is where the ID is needed to access the posters
print(movieGenreID)
//Update posters based on genreID
GenrePosters.updateGenrePoster(genreID: movieGenreID, urlExtension: "movies", completionHandler: {posters in
//Must iterate through multiple arrays with many containing the same poster strings
for poster in posters {
//Check to see if array already has the current poster string, if it does continue, if not append to array
if self.posterStringArray.contains(poster){
continue
} else {
self.posterStringArray.append(poster)
//Use the poster string to download the corresponding poster
self.networkManager.downloadImage(imageExtension: "\(poster)",
{ (imageData) //imageData = Image data downloaded from web
in
if let image = UIImage(data: imageData as Data){
self.posterImageArray.append(image)
}
})
}
}
})
}
}
DispatchQueue.main.async {
self.genresTableView.reloadData()
}
})
As of right now all its doing is accessing the first array of the JSON data(there are 19 arrays)and appending every string from that first array to the posterStringArray but instead I need it to go through each array and only append the string if doesn't already exist in the posterStringArray.

Answer 1

I am not 100 percent sure I understood your question, but shouldn't you replace:
for _ in self.genreDataArray {
if let movieGenreID = self.genreDataArray[0].id
with
for item in self.genreDataArray {
if let movieGenreID = item.id
update
to only add one item try adding a break after getting the image:
//Use the poster string to download the corresponding poster
self.networkManager.downloadImage(imageExtension: "\(poster)",
{ (imageData) //imageData = Image data downloaded from web
in
if let image = UIImage(data: imageData as Data){
self.posterImageArray.append(image)
}
})
break