swift - 有没有一种干净的方法可以将 CNPostalAddress 转换为 CNMutablePostalAddress？

Question

我想修改 CNPostalAddress 的值，它是从 CLPlacemark 的 postalAddress 属性中获得的。

由于 CNPostalAddress 具有不可变属性，我想将其转换为 CNMutablePostalAddress。但是，似乎没有一种干净的方法可以做到这一点。我目前的方法是这样的:

extension CNPostalAddress {
    var mutableAddress: CNMutablePostalAddress {
        let address = CNMutablePostalAddress()

        address.city = city
        address.country = country
        address.postalCode = postalCode
        address.state = state
        address.street = street

        [...]

        return address
    }
}

有没有更好的方法来进行这种转换？

Answer 1

CNPostalAddress 是一个扩展 NSObject 的类。这意味着您可以访问 mutableCopy。

let contact = ... // some CNPostalAddress instance obtained elsewhere
let newContact = contact.mutableCopy() as! CNMutablePostalAddress
newContact.city = "Here"

无需复制单个属性。

或者作为扩展的更新:

extension CNPostalAddress {
    var mutableAddress: CNMutablePostalAddress {
        return mutableCopy() as! CNMutablePostalAddress
    }
}

let contact = ... // some CNPostalAddress instance obtained elsewhere
let newContact = contact.mutableAddress
newContact.city = "Here"