Не знаю почему, но когда я открываю приложение, загрузка всех данных на экране занимает некоторое время, пока не останется белый экран без содержимого.Все загруженные данные загружаются из API.Что я должен сделать, чтобы сделать его лучше?
Приложение загружается примерно через 10 секунд:
Я опубликую ниже, как я анализирую все данные. ViewController.swift:
import UIKit
class ViewController: UIViewController, UICollectionViewDataSource, UITableViewDataSource {
@IBOutlet weak var tableViewTopSell: UITableView!
@IBOutlet var collectionView: UICollectionView!
@IBOutlet weak var collectionViewBanner: UICollectionView!
var dataSource: [Content] = [Content]()
var dataBanner: [Banner] = [Banner]()
var dataTopSold: [Top10] = [Top10]()
override func viewDidLoad() {
super.viewDidLoad()
//SetupNavBarCustom
self.navigationController?.navigationBar.CustomNavigationBar()
let logo = UIImage(named: "tag.png")
let imageView = UIImageView(image:logo)
self.navigationItem.titleView = imageView
//CallAPIData
getTopSold { (data) in
DispatchQueue.main.async {
self.dataTopSold = data
self.tableViewTopSell.reloadData()
}
}
getBanner { (data) in
DispatchQueue.main.async {
self.dataBanner = data
self.collectionViewBanner.reloadData()
}
}
getAudiobooksAPI { (data) in
DispatchQueue.main.async {
self.dataSource = data
self.collectionView.reloadData()
}
}
}
//CollectionView
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if (collectionView == self.collectionView) {
return self.dataSource.count
}else{
return self.dataBanner.count
}}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if (collectionView == self.collectionView) {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "collectionViewCell", for: indexPath) as! CollectionViewCell
let content = self.dataSource[indexPath.item]
cell.bookLabel.text = content.descricao
cell.bookImage.setImage(url: content.urlImagem, placeholder: "")
return cell
}else if (collectionView == self.collectionViewBanner) {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "collectionViewCellBanner", for: indexPath) as! CollectionViewCell
let content = self.dataBanner[indexPath.item]
cell.bannerImage.setImage(url: content.urlImagem, placeholder: "")
return cell
}
return UICollectionViewCell()
}
//TableView
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.dataTopSold.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "topSoldCell", for: indexPath) as! TableViewCell
let content = self.dataTopSold[indexPath.item]
cell.labelNomeTopSell.text = content.nome
cell.imageViewTopSell.setImage(url: content.urlImagem, placeholder: "")
return cell
}
}
extension UIImageView{
func setImage(url : String, placeholder: String, callback : (() -> Void)? = nil){
self.image = UIImage(named: "no-photo")
URLSession.shared.dataTask(with: NSURL(string: url)! as URL, completionHandler: { (data, response, error) -> Void in
guard error == nil else{
return
}
DispatchQueue.main.async(execute: { () -> Void in
let image = UIImage(data: data!)
self.image = image
if let callback = callback{
callback()
}
})
}).resume()
}
}
DataStore.swift:
import Foundation
import UIKit
func getBanner(_ completion:@escaping ([Banner])->Void) {
let url = URL(string: "https://alodjinha.herokuapp.com/banner")
let session = URLSession.shared
guard let unwrappedURL = url else { print("Error unwrapping URL"); return }
let dataTask = session.dataTask(with: unwrappedURL) { (data, response, error) in
guard let unwrappedDAta = data else { print("Error unwrapping data"); return }
do {
let jsonBanner = try JSONDecoder().decode(BannerData.self, from: unwrappedDAta)
completion(jsonBanner.data)
} catch {
print("Could not get API data. \(error), \(error.localizedDescription)")
}
}
dataTask.resume()
}
func getTopSold(_completion:@escaping ([Top10])->Void) {
let url = URL(string: "https://alodjinha.herokuapp.com/produto/maisvendidos")
let session = URLSession.shared
guard let unwrappedURL = url else { print("Error url"); return}
let dataTask = session.dataTask(with: unwrappedURL) { (data, response, error) in
guard let unwrappedData = data else { print("Error data"); return}
do {
let jsonTop10 = try JSONDecoder().decode(Top10Data.self, from: unwrappedData)
_completion(jsonTop10.data)
}catch{
print("Could no get API data")
}
}
dataTask.resume()
}
Model.swift:
import Foundation
//Categorias
struct Contents : Decodable {
let data : [Content]
}
struct Content : Decodable {
let id : Int
let descricao : String
let urlImagem : String
}
//Banner
struct BannerData : Decodable {
let data : [Banner]
}
struct Banner : Decodable {
let id : Int
let urlImagem : String
let linkUrl : String
}
//Top10
struct Top10Data:Decodable {
let data: [Top10]
}
struct Top10:Decodable {
let id : Int
let nome : String
let urlImagem : String
}