在 NSObject 上实现 NSCoding

Question

我只在 NSObject class 上遇到这些错误。 UIButton 和 UILabel 没有这个错误。

class Foo: NSObject, NSCoding {
    var title = ""
    var children: [Foo] = []



    // MARK: NSCoding
    override public func encode(with coder: NSCoder) {
        super.encode(with: coder)
        coder.encode(title as Any?, forKey: "title")
        coder.encode(children as Any?, forKey: "children")
    }

    required public init?(coder decoder: NSCoder) {
        super.init(coder: decoder)
        self.title = decoder.decodeObject(forKey: "title") as? String ?? ""
        self.children = decoder.decodeObject(forKey: "children") as? [Foo] ?? []
    }

}

有什么想法吗？

Answer 1

NSCoding（以及我认为您应该使用的 Codable）是一个协议，因此您不会覆盖任何内容，因此删除 override 和对 [=14= 的任何调用]

public func encode(with coder: NSCoder) {
    coder.encode(title as Any?, forKey: "title")
    coder.encode(children as Any?, forKey: "children")
}

required public init?(coder decoder: NSCoder) {
    self.title = decoder.decodeObject(forKey: "title") as? String ?? ""
    self.children = decoder.decodeObject(forKey: "children") as? [Foo] ?? []
}

在 NSObject 上实现 NSCoding

Implement NSCoding on NSObject

swift

nsobject

nscoding