iOS获取PHAsset的图片或视频资源的本地地址URL

• 项目中，之前使用UIImagePickerController来管理图片，获取动图后返回选取界面无法正常使用，这个是iOS系统设计UIImagePickerController的bug，暂时无法修复，而且苹果自身也将不再更新维护这个API了，所以项目改用PHPickerViewController管理图片资源。
• 但是项目需求需要获取保存图片的地址，但是PHAsset本身并不带URL,而PHImageManager.default().requestImageData获取到info并不像UIImagePickerController代理方法中imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey: Any])携带imageURL。
• 不过PHAsset提供requestContentEditingInput方法返回的闭包的PHContentEditingInput的参数里有fullSizeImageURL

swift代码：

extension PHAsset {
    func getURL(completionHandler: @escaping ((_ responseURL: URL?) -> Void)) {
        if self.mediaType == .image {
            let options: PHContentEditingInputRequestOptions = PHContentEditingInputRequestOptions()
            options.isNetworkAccessAllowed = true //开通网络访问权限
            options.canHandleAdjustmentData = {(_ adjustmeta: PHAdjustmentData) -> Bool in
                return true
            }
            self.requestContentEditingInput(with: options, completionHandler: {(_ contentEditingInput: PHContentEditingInput?, _ info: [AnyHashable: Any]) -> Void in
                completionHandler(contentEditingInput?.fullSizeImageURL as URL?)
            })
        } else if self.mediaType == .video {
            let options: PHVideoRequestOptions = PHVideoRequestOptions()
            options.version = .original
            options.isNetworkAccessAllowed = true
            PHImageManager.default().requestAVAsset(forVideo: self, options: options, resultHandler: {(_ asset: AVAsset?, _ audioMix: AVAudioMix?, _ info: [AnyHashable: Any]?) -> Void in
                if let urlAsset = asset as? AVURLAsset {
                    let localVideoUrl: URL = urlAsset.url as URL
                    completionHandler(localVideoUrl)
                } else {
                    completionHandler(nil)
                }
            })
        }
    }
}