Data passing from model not showing in UI after using Alamofire - ios

Question

So I have created a model to download data (images, title, desc) using alamofire. But having problem to pass the data and update it in the viewController. If I put the functions in viewController's viewDidLoad then it is working very fine. But I want to use the MVC model. Here is the code for the model:
class PageControllerView {
var _titleName : String!
var _titleDesc : String!
var _image : UIImage!
var titleName : String {
if _titleName == nil {
_titleName = ""
print("titlename is nil")
}
return _titleName
}
var titleDesc : String {
if _titleDesc == nil {
print("tittledesc is nile")
_titleDesc = ""
}
return _titleDesc
}
var image : UIImage {
if _image == nil {
print("Image view is nill")
_image = UIImage(named: "q")
}
return _image
}
func getPageControllerData(_ page : Int) {
Alamofire.request("\(BASE_URL)movie/now_playing?api_key=\(API_KEY)&language=en-US&page=1").responseJSON { (response) in
if let JSON = response.result.value {
if let json = JSON as? Dictionary<String, Any> {
if let results = json["results"] as? [Dictionary<String, Any>] {
if let overview = results[page]["overview"] as? String {
self._titleDesc = overview
}
if let releaseDate = results[page]["release_date"] as? String {
if let title = results[page]["title"] as? String {
let index = releaseDate.index(releaseDate.startIndex, offsetBy: 4)
self._titleName = "\(title) (\(releaseDate.substring(to: index)))"
}
}
if let image_url = results[page]["poster_path"] as? String{
Alamofire.request("\(BASE_URL_IMAGE)\(IMAGE_SIZE)\(image_url)").downloadProgress(closure: { (progress) in
print(progress.fractionCompleted)
}).responseData(completionHandler: { (response) in
print("completed downloading")
if let imageData = response.result.value {
self._image = UIImage(data: imageData)
}
})
}
}
}
}
}
}
}
And this is the viewControllers code (It is working fine but i want to pass the model. The alamofirefuntion is also present in the viewcontroller):
override func viewDidLoad() {
super.viewDidLoad()
print("viewdidload")
getPageControllerData(13)
self.updatePageControllerUI()
}
func updatePageControllerUI() {
pageControllerMovieLabel.text = pageControllerView.titleName
pageControllerSubLabel.text = pageControllerView.titleDesc
pageControlImageView.image = pageControllerView.image
}
func getPageControllerData(_ page : Int) {
Alamofire.request("\(BASE_URL)movie/now_playing?api_key=\(API_KEY)&language=en-US&page=1").responseJSON { (response) in
if let JSON = response.result.value {
if let json = JSON as? Dictionary<String, Any> {
if let results = json["results"] as? [Dictionary<String, Any>] {
if let overview = results[page]["overview"] as? String {
self.pageControllerSubLabel.text = overview
}
if let releaseDate = results[page]["release_date"] as? String {
if let title = results[page]["title"] as? String {
let index = releaseDate.index(releaseDate.startIndex, offsetBy: 4)
self.pageControllerMovieLabel.text = "\(title) (\(releaseDate.substring(to: index)))"
}
}
if let image_url = results[page]["poster_path"] as? String{
Alamofire.request("\(BASE_URL_IMAGE)\(IMAGE_SIZE)\(image_url)").downloadProgress(closure: { (progress) in
print(progress.fractionCompleted)
}).responseData(completionHandler: { (response) in
if let imageData = response.result.value {
self.pageControlImageView.image = UIImage(data: imageData)
}
})
}
}
}
}
}
}
My question is how to pass the model so that i can use like this, by using the PageControllerView object.
override func viewDidLoad() {
super.viewDidLoad()
print("viewdidload")
pageControllerView.getPageControllerData(13)
self.updatePageControllerUI()
}
Now I have checked that this code works but the image is still not shown at firstgo since it has not been downloaded completely but the title and description is showing.
override func viewDidLoad() {
super.viewDidLoad()
print("viewdidload")
pageControllerView.getPageControllerData(4)
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
self.updatePageControllerUI()
}