Hi,
I have a collectionview and I have to view images in the cells, so I download the images. But I want to download all the images even when the cells of the collectionview is not visible, therefore the user has not scrolled through the whole collectionview. I know in advance the number of images to download. I use Firebase. Code:
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "StickerCell", for: indexPath) as! StickerCell
if(self.stickerPack != nil){
cell.sticker = stickerPack.stickers[indexPath.row]
}else{
var string = ""
string = self.arrLinkImagesStickers[indexPath.row]
self.downloadImages(folderPath: string, success: { (img) in
DispatchQueue.main.async {
self.imageArray?.insert(img, at: indexPath.row)
cell.imageView.image = img
}
}) { (error) in
print(error)
}
}
return cell
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if(self.stickerPack != nil){
return self.stickerPack.stickers.count
}
return numStickers
}
func downloadImages(folderPath:String,success:@escaping (_ image:UIImage)->(),failure:@escaping (_ error:Error)->()){
let reference = Storage.storage().reference(withPath: folderPath)
reference.getData(maxSize: (1 * 1024 * 1024)) { (data, error) in
if let _error = error{
print(_error)
DispatchQueue.main.async {
failure(_error)
}
} else {
if let _data = data {
let myImage:UIImage! = UIImage(data: _data)
DispatchQueue.main.async {
success(myImage)
}
}
}
}
}
How can I solve it?Thanks! 