Ios Swift如何访问嵌套结构中的信息？

我有一个包含主题和子主题信息的大型嵌套结构数据文件

struct Topic{
    struct Topic1{
      let name = "Topic 1"
        let description = "Topic 1 description here."

        struct SubtopicUniqueName1 {
            let title = "Subtopic title here." 
            let subtopicDescription = "Some lorem ipsum description...."
            let subtopicContent = ["First Sentence", "Second Sentence", "Hello"]
        }

        struct SubtopicUniqueName2 {
            let title = "Subtopic title here." 
            let subtopicDescription = "Some lorem ipsum description...."
            let subtopicContent = ["First Sentence", "Second Sentence", "Hello"]
        }
    }

    struct Topic2{
        let name = "Topic 2"
        let description = "Topic 2 description here."
        struct SubtopicUniqueName3 {
            let title = "Subtopic title here." 
            let subtopicDescription = "Some lorem ipsum description...."
            let subtopicContent = ["First Sentence", "Second Sentence", "Hello"]
        }
    }
}

我想得到Topic1，Topic2。。。以此类推，因为我最终将有多达14个主题。当我尝试

let allTopics=[Topic.Topic1，Topic.Topic2]

我想通过这样的方式获得信息

for i in allTopics{
   print(i().name)
}

---

最后，由于子主题结构嵌套得更远，我会在主题中以类似的方式访问它们的内容吗

allTopics的类型是[Any]，它隐藏特定类的成员

解决方案：

使用属性

名称

和您感兴趣的任何其他属性创建协议，并将其应用于应具有这些属性的结构，然后创建实现协议的对象集合。 可以迭代集合，并且无需强制转换即可访问协议的属性

let allTopics: [TopicName] = [Topic.Topic1(), Topic.Topic2()]
allTopics.forEach {
    print($0)
}

protocol TopicName {
    var name: String { get }
}

struct Topic{
    struct Topic1: TopicName {
      let name = "Topic 1"
        let description = "Topic 1 description here."

        struct SubtopicUniqueName1 {
            let title = "Subtopic title here."
            let subtopicDescription = "Some lorem ipsum description...."
            let subtopicContent = ["First Sentence", "Second Sentence", "Hello"]
        }

        struct SubtopicUniqueName2 {
            let title = "Subtopic title here."
            let subtopicDescription = "Some lorem ipsum description...."
            let subtopicContent = ["First Sentence", "Second Sentence", "Hello"]
        }
    }

    struct Topic2: TopicName {
        let name = "Topic 2"
        let description = "Topic 2 description here."
        struct SubtopicUniqueName3 {
            let title = "Subtopic title here."
            let subtopicDescription = "Some lorem ipsum description...."
            let subtopicContent = ["First Sentence", "Second Sentence", "Hello"]
        }
    }
}

---

您混淆了值和类型。这里只有两种类型：主题和子主题。因此，让我们制作它们：

struct Topic {
    let name: String
    let description: String
    let subTopics: [SubTopic]
}

struct SubTopic {
    let title: String
    let description: String
    let content: [String]
}

其他一切都只是这两种类型之一的实例：

let topics = [
    Topic(
        name: "Topic 1",
        description: "Topic 1 description here.",
        subTopics: [
            SubTopic(
                title: "Subtopic title here.",
                description: "Some lorem ipsum description...",
                content: ["First Sentence", "Second Sentence", "Hello"]
            ),
            SubTopic(
                title: "Subtopic title here.",
                description: "Some lorem ipsum description...",
                content: ["First Sentence", "Second Sentence", "Hello"]
            ),
        ]
    ),
    Topic(
        name: "Topic 2",
        description: "Topic 2 description here.",
        subTopics: [
            SubTopic(
                title: "Subtopic title here.",
                description: "Some lorem ipsum description...",
                content: ["First Sentence", "Second Sentence", "Hello"]
            ),
        ]
    ),
]

由于这些只是常规数组，因此可以轻松迭代它们：

for topic in topics {
    print("\(topic.name) - \(topic.description)")
    print()

    for subTopic in topic.subTopics {
        let content = subTopic.content.joined(separator: "\n\t")
        print("""
            \(subTopic.title) - \(subTopic.description)
            \(content)

        """)
    }
}

输出：

Topic 1 - Topic 1 description here.

    Subtopic title here. - Some lorem ipsum description...
    First Sentence
    Second Sentence
    Hello

    Subtopic title here. - Some lorem ipsum description...
    First Sentence
    Second Sentence
    Hello

Topic 2 - Topic 2 description here.

    Subtopic title here. - Some lorem ipsum description...
    First Sentence
    Second Sentence
    Hello

---

非常感谢，这就是我问题的答案。如果我想访问其中一个主题下所有子主题的信息，是否需要创建新协议？例如，Topic1，获取[SubtopicUniqueName1，SubtopicUniqueName2]的数组，并使用方法获取数据。因此，如果我想访问每个子主题的“title”，我会将var title:String{get}添加到协议中，然后遍历我必须创建的适当数组，因为它嵌套得更深？@geistmate yes，没错，这是子弹孔上的绷带。当然，你可以在一个协议下统一所有这些不同的类型，但这并不能回答为什么首先有这么多类型的问题……但这也不是一个好主意。想象一下，每当你想打开一个不同的网页时，你都会买一台新电脑。那是毫无意义的。您将使用一台计算机，并访问多个页面。类似地，您应该只创建一些有意义的类型（

主题

，

子主题

，尽管它们看起来完全相同），并创建这些类型的多个不同实例，每个实例都具有您想要的值。从另一篇文章中的注释继续：对于我尝试执行的任务，这无疑是一个更好的解决方案。从这里，我可以轻松地将这些数据传递给我的视图控制器。关于计算机和网页的类比也很好，它帮助我更好地理解。非常感谢您的帮助。@geistmate嘿，这回答了您的问题吗？是的，先生，回答了。非常感谢。仅标记为答案。：）