Kingfisher の通信を Basic 認証に対応させる

ImageDownloadRequestModifier (AnyModifier) を利用して URLRequest に変更を加えると良い。

var options: KingfisherOptionsInfo = [
		.scaleFactor(UIScreen.main.scale),
		.transition(ImageTransition.fade(0.35)),
		]

let encodedAuth = …

let modifier: AnyModifier = AnyModifier.init(modify: { (req: URLRequest) -> URLRequest? in
	var r = req
	r.setValue("Basic \(encodedAuth)", forHTTPHeaderField: "Authorization")
	return r
})
options.append(.requestModifier(modifier))

imageView.kf.setImage(with: URL,
		      placeholder: placeholder,
		      options: options,
		      progressBlock: nil,
		      completionHandler: nil)