ios - Swift 无法通过下标赋值 : 'peerDeviceSettings' is a get-only property"

Question

我在类里面有这样的声明:

var peerDevice: [String: Any]? 

private var peerDeviceSettings:[String:Any]? {
    get {
        if let settings = peerDevice?["settings"] as? [String:Any] {
            return settings
        }

        return nil
    }
}

现在的问题是，如果我想更改 peerDeviceSettings，例如:

 fileprivate func set(_ value: Any?, forKey key: Key) {
    if peerDeviceSettings != nil {
        peerDeviceSettings?[key.rawValue] = value
    } 
 }

我得到一个错误

 Cannot assign through subscript: 'peerDeviceSettings' is a get-only property

关键是我如何在不创建新的可变变量 peerDeviceSettings 的情况下重新构建这个东西？

Answer 1

只需将 set (setter) 添加到属性中并在那里进行处理。

private var peerDeviceSettings:[String:Any]? {
    get {
        if let settings = peerDevice?["settings"] as? [String:Any] {
            return settings
        }

        return nil
    }
    set {

    }
}