I want to setImage with UIImage directly and not from any Source, Resource. I already have my image and want to set it with caching to my imageView.
let myImage = UIImage
kingfisherView.kf.setImage(with: myImage)
i want this to be done like i set image to UIImageView i.e
UIImageView.image = myImage
But with caching
i am not downloading image from a source i am generating them by myself (Latex). and caching them with
let cache = ImageCache.default
cache.store(renderedLaTeX ?? UIImage(), forKey: "image\(indexPath.row)")
I just want to set that cached image to my imageView.
UIImage.image = cachedImage
is not working and is loading image again and again as i scroll up and down in CollectionViewCell
Or any other way of doing this so that i don't have load imageView with a image again and again. My ImageView is inside UICollectionViewCell
You can store already existing image in Kingfisher cache by:
let image: UIImage = //...
ImageCache.default.store(image, forKey: cacheKey)
By default Kingfisher uses url.absoluteString as cacheKey.
So if you already downloaded image from somewhere and still have this url, you can store them in cache by yourself and next time Kingfisher will not download image, but use cached one
If you just want caching without downloading, then you could retrieve image by:
cache.retrieveImage(forKey: "cacheKey") { result in
switch result {
case .success(let value):
print(value.cacheType)
// If the `cacheType is `.none`, `image` will be `nil`.
print(value.image)
case .failure(let error):
print(error)
}
}
But since you using it inside collection view make sure that you stop loading on reuse of collectionViewCell
Example in cell:
We store imageKey inside cell and when Cache return image to us we make sure that cell haven't been reused yet and still need this image. If cell reused, then in prepareToReuse() we delete stored imageKey
class LatexCell: UICollectionViewCell {
@IBOutlet var formulaImageView: UIImageView!
private var imageKey: String?
func setup(with imageKey: String) {
self.imageKey = imageKey
ImageCache.default.retrieveImage(forKey: imageKey) { [weak self] result in
guard self?.imageKey == imageKey else { return } // cell have been reused
switch result {
case .success(let value):
self?.formulaImageView.image = value.image
case .failure(let error):
break /// no image stored, you should create new one
}
}
}
override func prepareForReuse() {
super.prepareForReuse()
imageKey = nil
formulaImageView.image = nil // Probably want here placeholder image
}
}