ios - 快速设置另一个 View 的背景

Question

我想让用户为应用程序的主视图选择背景。我想知道如何为另一个 View 执行此操作，即使该应用程序已被终止。

我考虑过在 Userdefaults 中保存图像的路径，然后从主视图中获取它，但我无法从 asset URL 设置背景>。有没有办法做到这一点 ？或者更好的方法？

这是我到目前为止所做的:

@IBOutlet weak var imageView: UIImageView!
var imagePicker = UIImagePickerController()

@IBAction func background(_ sender: Any) {
    self.imagePicker.allowsEditing = false
    self.imagePicker.sourceType = .savedPhotosAlbum

    imagePicker.modalPresentationStyle = .overCurrentContext
    self.present(imagePicker, animated: true, completion: nil)
}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    if let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage {

        self.imageView.contentMode = .scaleAspectFit
        let imageUrl = info[UIImagePickerControllerReferenceURL] as! URL
        UserDefaults.standard.set(imageUrl, forKey: "background")
        imageView.image = pickedImage

    }

    dismiss(animated: true, completion: nil)

}

func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
    self.imagePicker = UIImagePickerController()
    dismiss(animated: true, completion: nil)
}

Answer 1

如何从 viewDidLoad() 中的默认值加载 URL，然后调用 setImageFromURL？当然你必须将图像设置到你的 ImageView

func setImageFromURl(stringImageUrl url: String){

      if let url = NSURL(string: url) {
         if let data = NSData(contentsOf: url as URL) {
            self.image = UIImage(data: data as Data)
         }
      }
   }