Swift -- 将本地生成的UIImage进行持久化保存（存到文件中fileManager.createFile）

    //项目所需要的数据结构
    struct ImageSource {
   
   
    var img: UIImage
    var title: String
    
    init(img: UIImage, title: String) {
   
   
        self.img = img
        self.title = title
    }
}

    //Set方法
    var familyImgsSource:[ImageSource] = [] {
   
   
        didSet{
   
   
            collectionView.reloadData()
        }
    }
     
    //相册或者拍照的代理方法
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
   
   
        
        var selectedImage:UIImage? = info[UIImagePickerController