Question

我正在尝试将自定义对象保存到UserDefaults，并且我使用this作为源代码。它会立即在get部分崩溃。这是我的代码：

class Settings {

static let defaults:UserDefaults = UserDefaults.standard

///VIP object:
class VIP: NSObject, NSCoding {
    let email: String
    let name: String
    let relation: String

    init(email: String, name: String, relation: String) {
        self.email = email
        self.name = name
        self.relation = relation
    }
    required init(coder decoder: NSCoder) {
        self.email = decoder.decodeObject(forKey: "email") as! String 
        self.name = decoder.decodeObject(forKey: "name") as! String
        self.relation = decoder.decodeObject(forKey: "relation") as! String
    }

    func encode(with coder: NSCoder) {
        coder.encode(email, forKey: "email")
        coder.encode(name, forKey: "name")
        coder.encode(relation, forKey: "relation")
    }
}


///access VIPs array with this
static var VIPs: [Settings.VIP] {
    get {

        ////CRASH (vips is not nil, and some amount of bytes)
        if let vips = self.defaults.data(forKey: "VIPs"), let myPeopleList = NSKeyedUnarchiver.unarchiveObject(with: vips) as? [Settings.VIP] {
            myPeopleList.forEach({print($0.email)})
                return myPeopleList
            } else {
                return []
            }
        }
    set {
        let encodedData = NSKeyedArchiver.archivedData(withRootObject: newValue)
        self.defaults.set(encodedData, forKey: "VIPs")
        }
    }
}

不确定我是否遗漏了某些内容，字符串保存和检索成功，但不是这个自定义对象。

稍微重写这样的get方法：

get {

        if let vips = self.defaults.data(forKey: "VIPs"){
            print("counting: ", vips.count)

            if let myPeopleList = NSKeyedUnarchiver.unarchiveObject(with: vips) as? [Settings.VIP]{
                myPeopleList.forEach({print($0.email)})
            }
        }

帮助我理解它在NSKeyedUnarchiver.unarchiveObject()部分崩溃了。但原因尚不清楚。

记录错误：

Date/Time:           2017-09-12 21:00:43.4970 +0200
Launch Time:         2017-09-12 21:00:43.1623 +0200
OS Version:          iPhone OS 10.3.3 (14G5037b)
Report Version:      104

Exception Type:  EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note:  EXC_CORPSE_NOTIFY
Triggered by Thread:  2

Application Specific Information:
abort() called

Filtered syslog:
None found

Last Exception Backtrace:
0   CoreFoundation                  0x18f0c6fe0 __exceptionPreprocess + 124
1   libobjc.A.dylib                 0x18db28538 objc_exception_throw + 56
2   Foundation                      0x18fb4ab0c -[NSCoder(Exceptions) __failWithException:] + 132
3   Foundation                      0x18fb4acc0 -[NSCoder(Exceptions) __failWithExceptionName:errorCode:format:] + 436
4   Foundation                      0x18fb16dac _decodeObjectBinary + 408
5   Foundation                      0x18fb1df10 -[NSKeyedUnarchiver _decodeArrayOfObjectsForKey:] + 1544
6   Foundation                      0x18fab384c -[NSArray(NSArray) initWithCoder:] + 216
7   Foundation                      0x18fb17430 _decodeObjectBinary + 2076
8   Foundation                      0x18fb16b68 _decodeObject + 308
9   Foundation                      0x18fb15d94 +[NSKeyedUnarchiver unarchiveObjectWithData:] + 88
10  Prep                            0x100097274 0x100014000 + 537204
11  Prep                            0x100078384 0x100014000 + 410500
12  Prep                            0x100078bd8 0x100014000 + 412632
13  Prep                            0x1000a4370 0x100014000 + 590704
14  Prep                            0x1001084ac 0x100014000 + 1000620
15  Prep                            0x10010b180 0x100014000 + 1012096
16  Prep                            0x100044d28 0x100014000 + 199976
17  TCC                             0x1912d92f8 __TCCAccessRequest_block_invoke.73 + 492
18  TCC                             0x1912dc3d4 __tccd_send_block_invoke + 340
19  libxpc.dylib                    0x18e1baf30 _xpc_connection_reply_callout + 80
20  libxpc.dylib                    0x18e1baea0 _xpc_connection_call_reply + 40
21  libdispatch.dylib               0x18df7e9a0 _dispatch_client_callout + 16
22  libdispatch.dylib               0x18df8d0d4 _dispatch_queue_override_invoke + 644
23  libdispatch.dylib               0x18df8ea50 _dispatch_root_queue_drain + 540
24  libdispatch.dylib               0x18df8e7d0 _dispatch_worker_thread3 + 124
25  libsystem_pthread.dylib         0x18e187100 _pthread_wqthread + 1096
26  libsystem_pthread.dylib         0x18e186cac start_wqthread + 4

更新

它仅在第二次运行时从xcode发生，所以第一次运行 - 它工作，并尝试再次运行 - 与所描述的输出崩溃。那么存在对象一定有什么东西吗？

Answer 1

根据https://stackoverflow.com/a/4197319/4601900 问题是不允许将自定义类存储为Settings plist（NSUserDefaults）中的节点，因为数据存储在文件系统中而不是应用程序中的对象。设置应用程序（此数据也将可见）不知道什么是＆＃34; VIP＆＃34;对象是。

我遇到了同样的问题，我设法解决了这个问题，将数据保存在文件中并从保存位置获取

我按照键

动态存储2-3个值

我创建了对我有用的通用函数。

let LocalServiceCacheDownloadDir        = "LocalData"
// Put your keys here
enum WSCacheKeys:String {
    case Key1 = "Test1"
    case Key2 = "Test2"
    case Key3 = "Test3"

}


func getBaseForCacheLocal(with fileName:String) -> String? {

        let filePath = FileManager.default.getDocumentPath(forItemName: self.LocalServiceCacheDownloadDir)
        if FileManager.default.directoryExists(atPath: filePath) {
            return filePath.stringByAppendingPathComponent(fileName)
        } else {
            if  FileManager.default.createDirectory(withFolderName: self.LocalServiceCacheDownloadDir) {
                return filePath.stringByAppendingPathComponent(fileName)
            }
        }
        return nil
    }



    //------------------------------------------------------------

    func cacheDataToLocal<T>(with Object:T,to key:WSCacheKeys) -> Bool {
        let success = NSKeyedArchiver.archiveRootObject(Object, toFile: getBaseForCacheLocal(with: key.rawValue)!)
        if success {
            Logger.success(s: "Local Data Cached\(String(describing: getBaseForCacheLocal(with: key.rawValue)))" as AnyObject)
        } else {
            Logger.error(s: "Sorry Failed")
        }

        return success

    }

    //------------------------------------------------------------

     func loadCachedDataFromLocal<T>(with key:WSCacheKeys ) -> [T]? {
        return NSKeyedUnarchiver.unarchiveObject(withFile: getBaseForCacheLocal(with: key.rawValue)!) as? [T]
    }


    //------------------------------------------------------------

您可以获取

等数据

    let objects:[VIP]? = DataManager.sharedManager.loadCachedDataFromLocal(with: .Key1)

响应来自webservice时如何保存

  self.cacheDataToLocal(with: response.result.value!, to: .Key1)

希望它对你有所帮助

Answer 2

我在Swift Playground上本地尝试过，效果很好。什么都没有崩溃。但Xcode建议我在VIP类名之前添加@objc。请确保我们正确地将值设置为VIP变量。

class Settings {

    static let defaults:UserDefaults = UserDefaults.standard

    ///VIP object:
    @objc(_TtCC10Playground8Settings3VIP)class VIP: NSObject, NSCoding {
        let email: String
        let name: String
        let relation: String

        init(email: String, name: String, relation: String) {
            self.email = email
            self.name = name
            self.relation = relation
        }
        required init(coder decoder: NSCoder) {
            self.email = decoder.decodeObject(forKey: "email") as! String
            self.name = decoder.decodeObject(forKey: "name") as! String
            self.relation = decoder.decodeObject(forKey: "relation") as! String
        }

        func encode(with coder: NSCoder) {
            coder.encode(email, forKey: "email")
            coder.encode(name, forKey: "name")
            coder.encode(relation, forKey: "relation")
        }
    }


    ///access VIPs array with this
    static var VIPs: [Settings.VIP] {
        get {

            ////CRASH (vips is not nil, and some amount of bytes)
            if let vips = self.defaults.data(forKey: "VIPs"), let myPeopleList = NSKeyedUnarchiver.unarchiveObject(with: vips) as? [Settings.VIP] {
                myPeopleList.forEach({print($0.email)})
                return myPeopleList
            } else {
                return []
            }
        }
        set {
            let encodedData = NSKeyedArchiver.archivedData(withRootObject: newValue)
            self.defaults.set(encodedData, forKey: "VIPs")
        }
    }
}


let vip = Settings.VIP.init(email: "dev.rnarendra@gmail.com", name: "naren", relation: "cool")

Settings.VIPs = [vip]
_ = Settings.VIPs

Answer 3

XCode 9建议我隐式设置VIP类的编码名称：

尝试进行以下更改并重复测试：

class Settings {

    static let defaults:UserDefaults = UserDefaults.standard

    ///VIP object:
    @objc(EncodedVIP)class VIP: NSObject, NSCoding {
        let email: String
        let name: String
        let relation: String

....

NSKeyedUnarchiver在第二次运行中崩溃了swift 3

3 个答案: