如何迭代任何数组

Question

我想知道如何迭代一组不同类型的对象。数组如下所示：

var messages: [Any] = [SentMessage(sent_text: "Halla", date_sent: "24.des", isSent: true, sending: false), RecievedMessage(profile_image: UIImage(named: "baseline_account_box_black_18pt")!, recieved_text: "Hei hva skjer?", date_recieved: "25.des", isRecieved: true)]

我尝试像这样转换迭代器：

for i in messages{

    guard let received = ReceivedMessage(i) else{
        return
    }


}

ReceivedMessages 和 SentMessages 都是结构体，如果需要查看更多代码，请询问。

Answer 1

使用可选绑定：

guard let received = i as? ReceivedMessage

不要将messages 声明为[Any]，而是让ReceivedMessage 和SentMessage 采用通用协议，然后messages 将是采用该协议的对象数组：

protocol Message {

}

struct SentMessage: Message {

}

struct ReceivedMessage: Message {

}

var messages: [Message]