Swift 3 Xcode 8 - SwiftValue encodeWithCoder - 发送到实例的无法识别的选择器

Question

我的自定义对象符合NSCoding协议,具有以下方法

required init(coder decoder: NSCoder) {
    super.init()

    createdDate = decoder.decodeObject(forKey: "created_date") as? Date
    userId = decoder.decodeInteger(forKey: "user_id")
}

func encode(with aCoder: NSCoder) {
    aCoder.encode(createdDate, forKey: "created_date")
    aCoder.encode(userId, forKey: "user_id")
}

这是Swift 3中nscoding协议的正确方法名称,但应用程序因错误而崩溃 SwiftValue encodeWithCoder - unrecognized selector sent to instance

显然这种方法不可用,为什么不被认可？

参考https://developer.apple.com/reference/foundation/nscoding

这是我制作的归档方法

func encodeObject(_ defaults:UserDefaults, object:NSCoding?, key:String) {
    if (object != nil) {
        let encodedObject = NSKeyedArchiver.archivedData(withRootObject: object)
        defaults.set(encodedObject, forKey: key)
    } else {
        defaults.removeObject(forKey: key)
    }
}

Answer 1

问题是您正在尝试存档可选项.替换此行:

if (object != nil) {

有:

if let object = object {