CODEWITHSUNDEEP
iosswiftuicollectionview
mvasco
mvasco

Reputation: 5101

CollectionView is not showing any item

I don't know what am I doing wrong.

I have a viewController with a collectionView.

I have set the collectionView delegates as follows, in viewController and also at storyboard:

modelosCV.delegate = self
modelosCV.dataSource = self

I have created all collectionView methods:

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return filtrados ? modelosFiltrados.count : modelos.count
    }

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {



    let cellModelos = collectionView.dequeueReusableCell(withReuseIdentifier: "modelo", for: indexPath) as! ModelosCollectionViewCell



    print(filtrados ? modelosFiltrados[indexPath.row].icono : modelos[indexPath.row].icono)

    let foto_modelo = filtrados ? modelosFiltrados[indexPath.row].icono : modelos[indexPath.row].icono

    let modelo_nombre = filtrados ? modelosFiltrados[indexPath.row].nombre : modelos[indexPath.row].nombre
    cellModelos.modelo_nombre.text = modelo_nombre

    let url = URL(string: "https://j../iconos/"+foto_modelo)

    UIImage.loadFrom(url: url!) { image in
        cellModelos.modelo_icono.image = image

    }


    return cellModelos


}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {


       let padding: CGFloat =  50
        let collectionViewSize = collectionView.frame.size.width - padding

        return CGSize(width: collectionViewSize/2, height: 242)
    }

I am populating the collectionView from a remote JSON source:

func downloadJSONModelos(completed: @escaping () -> ()) {

    var categoria = ""



    let cat = self.defaults.string(forKey: "nueva_alarma_categoria")
    if (cat == "Móviles"){
        categoria = "3"
    }
    if (cat == "Tablets"){
        categoria = "5"
    }
    if (cat == "Smartwatches"){
        categoria = "7"
    }
    let marca_id = self.defaults.string(forKey: "nueva_alarma_marca_id")
    let url = URL(string: "https:.....php?marca="+marca_id!+"&cat="+categoria)


    URLSession.shared.dataTask(with: url!) { (data,response,error) in

        print(data as Any)
        print(response as Any)

        if error == nil {
            do {
                self.modelos = try JSONDecoder().decode([Modelos].self, from: data!)


                DispatchQueue.main.async {
                    completed()
                }

            }catch{

            }
            print(self.modelos)
        }
    }.resume()


}

The app is receiving the JSON array as it is printed in the output, but the collectionView remains empty.

What am I missing?

Upvotes: 2

Views: 86

Answers (1)

Picode
Picode

Reputation: 1158

Add this to your viewDidLoad : 

yourCollectionView.register(UINib(nibName: "yourXibName", bundle: nil), forCellWithReuseIdentifier: "modelo")

And reload your collectionView with yourCollectionView.reloadData() at where you append element to your array from JSON.

Hope it helps...

Upvotes: 2

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