Image Manager

imagemanager.swift

final fileprivate class Weak<A: AnyObject> {
    weak var value: A?
    init(_ value: A) {
        self.value = value
    }
}

final class ImageManager {
    fileprivate var values: [URL:Weak<Resource<UIImage>>] = [:]
    
    func load(url: URL) -> Resource<UIImage> {
        if let v = values[url]?.value { return v }
        let loader = Resource(Endpoint(imageURL: url))
        values[url] = Weak(loader)
        return loader
    }
    
    static let shared = ImageManager()
}