let optionMenuController = UIAlertController(title: nil, message: "选择图片", preferredStyle: .actionSheet)

        let libraryAction = UIAlertAction(title: "从相册选择", style: .default, handler: {

            (alert: UIAlertAction!) -> Void in

        })

        let cameraAction = UIAlertAction(title: "拍照", style: .default, handler: {

            (alert: UIAlertAction!) -> Void in

        })

        let cancelAction = UIAlertAction(title: "取消", style: .default, handler: {

            (alert: UIAlertAction!) -> Void in

        })

        optionMenuController.addAction(libraryAction)

        optionMenuController.addAction(cameraAction)

        optionMenuController.addAction(cancelAction)

        self.present(optionMenuController, animated: true, completion: nil)