swift - 如何在照片库 Swift 中保存图片？

Question

我是 Swift 初学者，刚刚在我的应用程序中完成了我的照片相机功能。我现在遇到的问题是，当我从相机拍摄照片时，它没有保存到我 iPhone 上的照片库中。一切正常我可以拍照，但是当我检查照片时，它们似乎没有保存。我已经检查过类似的问题，但没有找到合适的答案，我看到他们是添加按钮以直接访问照片库的人，但我不需要这样的按钮。我需要的唯一功能是拍照，当用户单击选择照片以将其保存在照片中时。

到目前为止我用过这个:

class ViewController: UIViewController, UIImagePickerControllerDelegate,UINavigationControllerDelegate{



 let imagePicker: UIImagePickerController! = UIImagePickerController()

   override func viewDidLoad() {

    super.viewDidLoad()

    imagePicker.delegate = self

    let upSwipe = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipes))

    upSwipe.direction = .up

    view.addGestureRecognizer(upSwipe)

}

和函数:

func handleSwipes(sender:UISwipeGestureRecognizer) {

        if (sender.direction == .up){

            if ( UIImagePickerController.isSourceTypeAvailable(.camera)){



                if UIImagePickerController.availableCaptureModes(for: .rear) != nil {
                    imagePicker.allowsEditing = false
                    imagePicker.sourceType = .camera
                    imagePicker.cameraCaptureMode = .photo
                    present(imagePicker,animated: true, completion: {})
       }
            }

这是我在 iPhone 上得到的:我只希望当用户选择使用照片时，照片本身保存在图库中，就这么简单。

Answer 1

在任何事情之前，您需要将“隐私 - 照片库添加使用说明”添加到您的 info.plist 中，否则您的应用将崩溃

使用这个:

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        if let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage{
            UIImageWriteToSavedPhotosAlbum(pickedImage, self, #selector(image(_:didFinishSavingWithError:contextInfo:)), nil)

            dismiss(animated: true, completion: nil)
        }
    }

然后，添加如下函数(和saltTigerK写的函数一样)

func image(_ image: UIImage, didFinishSavingWithError error: Error?, contextInfo: UnsafeRawPointer) {
    if let error = error {
        // we got back an error!
        let ac = UIAlertController(title: "Save error", message: error.localizedDescription, preferredStyle: .alert)
        ac.addAction(UIAlertAction(title: "OK", style: .default))
        present(ac, animated: true)
    } else {
        let ac = UIAlertController(title: "Saved!", message: "Your altered image has been saved to your photos.", preferredStyle: .alert)
        ac.addAction(UIAlertAction(title: "OK", style: .default))
        present(ac, animated: true)
    }
}

来源:https://www.hackingwithswift.com/read/13/5/saving-to-the-ios-photo-library