如何使用 NSKeyedArchiver swift 将复杂的 Arrayobjects 保存到设备

Question

我想使用 swift 中的 NSKeyedArchiver 将任何 class 类型的数组（例如让数组 = SymptomModel）保存到设备中。

如果 SymptomsModel class 包含所有具有原始数据类型的变量，我知道如何保存一个数组，但如果还包含任何其他 class 的数组，我不知道如何保存它它的属性

下面我已经借助示例解释了我的问题，请仔细阅读并提供解决方案。我有一个 class

class SymptomsModel: NSObject, NSCoding ,ResponseJSONObjectSerializable   {
            var slug:String?
            var name:String?
            var images:[Sym_images]?
            var videos:[Sym_videos]?

    struct Keys {
            static let Name = "name"
            static let Slug = "slug"
            static let Images = "images"
            static let Videos = "videos"
         }

     required init(json:SwiftyJSON.JSON) {
         self.slug = json["slug"].string
         self.name = json["name"].string

         self.images = [Sym_images]()
         if let imagesJSON = json["images"].array {
                for(imagesJSON) in imagesJSON {
                    if let newImages = Sym_images(json: imagesJSON){
                        self.images?.append(newImages)
                    }
                }

          }

          self.videos = [Sym_videos]()
          if let videosJSONArray = json["videos"].array {

                for(videosJSON) in videosJSONArray {
                    if let newVideos = Sym_videos(json: videosJSON){
                        self.videos?.append(newVideos)
                    }
                }

           }
       }


  init(dictionary: [String : AnyObject]) {
     self.name = dictionary[Keys.Name] as? String
     self.slug = dictionary[Keys.Slug] as? String
     self.images = dictionary[Keys.Images] as? [Sym_acc_images_objects]

     self.videos = dictionary[Keys.Videos] as? [Sym_acc_videos_objects]

   }
func encodeWithCoder(archiver: NSCoder) {
    archiver.encodeObject(name, forKey: Keys.Name)
    archiver.encodeObject(slug, forKey: Keys.Slug)

    archiver.encodeObject(images, forKey: Keys.Images)
    archiver.encodeObject(videos, forKey: Keys.Videos)
}
required init(coder unarchiver: NSCoder) {
    super.init()
    name = unarchiver.decodeObjectForKey(Keys.Name) as? String
    slug = unarchiver.decodeObjectForKey(Keys.Slug) as? String
    self.images =  unarchiver.decodeObjectForKey(Keys.Slug) as? [Sym_acc_images_objects]
    self.videos =  unarchiver.decodeObjectForKey(Keys.Slug) as? [Sym_acc_videos_objects]
   }

和一个 PersistanceManager class 使用 NskeyedArchiver 将数据保存为

    class PersistenceManager {

    class private func documentsDirectory() -> NSString {
        let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
        let documentDirectory = paths[0] as String
        return documentDirectory
    }

    class func saveNSArray(arrayToSave: NSArray, key: String) {
        print(" saveNSArray key : \(key)")
        let file = documentsDirectory().stringByAppendingPathComponent(key)
        NSKeyedArchiver.archiveRootObject(arrayToSave, toFile: file)

    }

    class func loadNSArray(path: String) -> NSArray? {
        print(" loadNSArray key : \(path)")
        let file = documentsDirectory().stringByAppendingPathComponent(path)
        let result = NSKeyedUnarchiver.unarchiveObjectWithFile(file)
        return result as? NSArray
    }
}

这是我保存然后检索数组的实现

class ViewController: UIViewController{
  var ArraySymptom = [SymptomsModel]()

  override func viewDidLoad() {
    super.viewDidLoad()
    ArraySymptom = loadArray()

    //saving data in device
    PersistenceManager.saveNSArray(ArraySymptom, key: "Symptom")


   //loading data from device
       if let value = PersistenceManager.loadNSArray("Symptom") as? [SymptomsModel]  {
            let images = value[0].images
            print("images : \(images)")
            let slug = value[0].slug
            print("slug : \(slug)")
       }              
  }

这里能够获取 slug 的值但不能获取图像值。这可能是因为 slug 是 String 类型而 Images 是 Custom Class type 。请建议我完成它的方式。可以使用 NSKeyedArchiver 保存这些类型的数组，这样我就可以通过从设备中检索 ArraySymptom 来访问图像值。

Answer 1

这是个愚蠢的错误

我在图像中得到的是零，因为它是用错误的密钥解码的，是复制粘贴错误

错误在这个函数中..

required init(coder unarchiver: NSCoder) {
super.init()
name = unarchiver.decodeObjectForKey(Keys.Name) as? String
slug = unarchiver.decodeObjectForKey(Keys.Slug) as? String
self.images =  unarchiver.decodeObjectForKey(Keys.Slug) as? [Sym_images]
self.videos =  unarchiver.decodeObjectForKey(Keys.Slug) as? [Sym_videos]

}

正确的解码必须是

self.images = unarchiver.decodeObjectForKey(Keys.Images) as? [Sym_images]

self.videos = unarchiver.decodeObjectForKey(Keys.Videos) as? [Sym_videos]

如何使用 NSKeyedArchiver swift 将复杂的 Arrayobjects 保存到设备

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