image picker source code swift

image_picker_source_code.swift

func launchLibrary() -> Void {
    guard let callback = self.globalCallback else { return }
    let fetchOptions = PHFetchOptions()
    fetchOptions.includeAssetSourceTypes = .typeUserLibrary
    fetchOptions.sortDescriptors = [.init(key: "creationDate", ascending: false)]
    self.fetchedAssets = PHAsset.fetchAssets(with: .image, options: fetchOptions)
    self.imageShowerViewController = ImageShowerViewController(fetchedAssets: self.fetchedAssets, options: self.options, callback: callback)
    
    guard let imageShowerViewController = self.imageShowerViewController else { return }
    PHPhotoLibrary.shared().register(self)
    
    DispatchQueue.main.async {
        guard let rootViewController = RCTPresentedViewController() else { return }
        let navigationController = UINavigationController(rootViewController: imageShowerViewController)
        navigationController.modalPresentationStyle = .overFullScreen
        rootViewController.present(navigationController, animated: true, completion: nil)
    }
}