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重點是一定要加這兩個  UINavigationControllerDelegate 和  UIImagePickerControllerDelegate

class ViewController: UIViewController, UINavigationControllerDelegate,UIImagePickerControllerDelegate {

當按下button

先初始化一個   imagePickerController

設置  imagePickerController.delegate = self

然後選擇媒體type     imagePickerController.sourceType = UIImagePickerControllerSourceType.photoLibrary

接下來就是present

 @IBAction func importImage(_ sender: Any) {

        

        let imagePickerController = UIImagePickerController()

        imagePickerController.delegate = self

        imagePickerController.sourceType = UIImagePickerControllerSourceType.photoLibrary

        imagePickerController.allowsEditing = false

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

        

    }

然後記得在 info.plist 裡面加入權限要求

就可以執行了

接下來是要使用選到的相片

 @IBOutlet weak var imageview: UIImageView!

實作這個function...

去找   info[UIImagePickerControllerOriginalImage].. 然後把他轉型成UIImage...

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {

        if let image = info[UIImagePickerControllerOriginalImage] as? UIImage{

            imageview.image = image

        }else{

            print("couldn't find image")

        }

        

        self.dismiss(animated: true, completion: nil)

    }