如何在 swift 中通过 nsuserdefaults 存储像 CBPeripheral 这样的自定义数据？

Question

我正在使用 Swift 进行开发。我想通过存储自定义数据nsuserdefaults。

我的自定义数据如下

在ConnectedDevice.swift中

import UIKit
import Foundation
import CoreBluetooth
import CoreLocation

class ConnectedDevice : NSObject , NSCoding{

    var RSSI_threshold:NSNumber=0

    var Current_RSSI:NSNumber=0

    var name:String?

    var bdAddr:NSUUID?

    var ConnectState:Bool=false

    var AlertState:Int=0

    var BLEPeripheral : CBPeripheral!

    var DisconnectAddress:[String] = [String]()

    var DisconnectTime:[String] = [String]()

    var Battery:NSInteger=0

    var Location:[CLLocation] = [CLLocation]()

    var AlertStatus:Int!



    func encodeWithCoder(aCoder: NSCoder) {

        aCoder.encodeObject(RSSI_threshold, forKey: "RSSI_threshold")
        aCoder.encodeObject(Current_RSSI, forKey: "Current_RSSI")
        aCoder.encodeObject(name, forKey: "name")
        aCoder.encodeObject(bdAddr, forKey: "bdAddr")
        aCoder.encodeBool(ConnectState, forKey: "ConnectState")
        aCoder.encodeInteger(AlertState, forKey: "AlertState")
        aCoder.encodeObject(BLEPeripheral, forKey: "BLEPeripheral")
        aCoder.encodeObject(DisconnectAddress, forKey: "DisconnectAddress")
        aCoder.encodeObject(DisconnectTime, forKey: "DisconnectTime")
        aCoder.encodeObject(Battery, forKey: "Battery")
        aCoder.encodeObject(Location, forKey: "Location")
        aCoder.encodeObject(AlertStatus, forKey: "AlertStatus")


    }

    override init() {


    }

    required init?(coder aDecoder: NSCoder) {

        self.RSSI_threshold = aDecoder.decodeObjectForKey("RSSI_threshold") as! NSNumber
        self.Current_RSSI = aDecoder.decodeObjectForKey("Current_RSSI") as! NSNumber
        self.name = aDecoder.decodeObjectForKey("name") as? String
        self.bdAddr = aDecoder.decodeObjectForKey("bdAddr") as? NSUUID
        self.ConnectState = aDecoder.decodeObjectForKey("ConnectState") as! Bool
        self.AlertState = aDecoder.decodeObjectForKey("AlertState") as! Int
        self.BLEPeripheral = aDecoder.decodeObjectForKey("BLEPeripheral") as! CBPeripheral
        self.DisconnectAddress = aDecoder.decodeObjectForKey("DisconnectAddress") as! [String]
        self.DisconnectTime = aDecoder.decodeObjectForKey("DisconnectTime") as! [String]
        self.Battery = aDecoder.decodeObjectForKey("Battery") as! NSInteger
        self.Location = aDecoder.decodeObjectForKey("Location") as! [CLLocation]
        self.AlertStatus = aDecoder.decodeObjectForKey("AlertStatus") as! Int
    }
}

在ViewController.swift中

var userDefault = NSUserDefaults.standardUserDefaults()
var BLEConnectedDevice:[ConnectedDevice] = [ConnectedDevice]()

当我尝试存储数据时，我使用以下代码：

let data = NSKeyedArchiver.archivedDataWithRootObject(BLEConnectedDevice)
        NSUserDefaults.standardUserDefaults().setObject(data, forKey: "BLEConnectedDevice")
       userDefault.synchronize()

当我尝试加载数据时，我使用以下代码：

if let Data = NSUserDefaults.standardUserDefaults().objectForKey("BLEConnectedDevice") as? NSData {

    if let devcie = NSKeyedUnarchiver.unarchiveObjectWithData(Data) as? ConnectedDevice {

        print("NSUserDefaults = \(devcie.name)")

    }

}

但它会显示错误 aCoder.encodeObject(BLEPeripheral, forKey: "BLEPeripheral")，错误日志是

2016-08-24 18:37:57.022 Anti-Lost[476:222607] -[CBPeripheral encodeWithCoder:]: unrecognized selector sent to instance 0x14e9fc60
2016-08-24 18:37:57.024 Anti-Lost[476:222607] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[CBPeripheral encodeWithCoder:]: unrecognized selector sent to instance 0x14e9fc60'

如何编码CBPeripheral？

我错过了什么吗？nsuserdefaults如何通过swift存储自定义数据？

Answer 1

这是因为CBPeripheral没有实现NSCoding. 因此，您将无法将BLEPeripheral对象存档到NSUserDefaults.

我认为最好的解决方案是直接存储您感兴趣的属性（例如name或identifier）：

aCoder.encodeObject(BLEPeripheral.name, forKey: "BLEPeripheralName")
aCoder.encodeObject(BLEPeripheral.identifier, forKey: "BLEPeripheralIdentifier")

编辑：

CBPeripheral我认为无论如何，您将无法再次存储和构建您的。Apple 是CBPeripheral这样呈现该对象的：

所以，这似乎很合乎逻辑，你不能存储这个对象并稍后重新构建它......我认为最好的解决方案是存储BLEPeripheral.identifier并稍后CBPeripheral使用CBCentralManager. 使用方法就可以做到retrievePeripherals(withIdentifiers:)。这是文档。我认为你永远不应该CBPeripheral自己构建一个对象。