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iOS Build a Simple iPhone App with Swift Getting Started with iOS Development Swift Recap Part 1

Code cannot be compiled... Not sure why??

I cannot for the life of me figure this code challenge out. However, when I paste this code into an Xcode playground it seems to work fine. What am I missing?

structs.swift
struct Tag {
  let name: String
}


struct Post {
  let title: String
  let author: String
  let tag: Tag

  init(title: String, author: String, tag: String) {
    self.title = title
    self.author = author
    self.tag = Tag(name: tag)
  }

  func description() -> String {
    return "\(title) by \(author). Filed under \(tag.name)"
  }

}

let firstPost = Post(title: "iOS Development", author: "Mike Ernest", tag: "swift")
let postDescription = firstPost.description()

2 Answers

Dan Lindsay
Dan Lindsay
39,611 Points

Hey Mike,

The challenge doesnโ€™t ask for an init method, and yours has tag being type String, when it should be of type Tag . Also, when you created your firstPost constant, you didnโ€™t create the proper Tag

So to pass the first part of the challenge, this will work:

struct Tag {
  let name: String
}
struct Post {
  let title: String
  let author: String
  let tag: Tag
}

let firstPost = Post(title: "iOS Development", author: "Mike Ernest", tag: Tag(name: "swift"))

For the second part of the challenge, your description method is perfect, so nothing need to change there. Same for your postDescription constant. So this code will pass:

struct Tag {
  let name: String
}
struct Post {
  let title: String
  let author: String
  let tag: Tag

func description() -> String {
    return "\(title) by \(author). Filed under \(tag.name)"
  }

}

let firstPost = Post(title: "iOS Development", author: "Mike Ernest", tag: Tag(name: "swift"))
let postDescription = firstPost.description()

While you donโ€™t need the init method to pass the challenge, this one added to Post will still pass the challenge:

struct Post {
    var title: String
    var author: String
    var tag: Tag

    init(title: String, author: String, tag: Tag) {
        self.title = title
        self.author = author
        self.tag = tag
    }

    func description() -> String {
        return "\(title) by \(author). Filed under \(tag.name)"
    }
}

Hope this helps!

Dan

Thanks so much for taking the time to explain this. Really helpful and I understand where I went wrong.

The issue here is that the challenge doesn't ask you to create a custom initializer method.

struct Tag {
  let name: String
}

struct Post {
    var title: String
    var author: String
    var tag: Tag

    func description() -> String  {
        return "\(title) by \(author). Filed under \(tag.name)"
    }

}

let myTag = Tag(name: "Classics")
let firstPost = Post(title: "1984", author: "George Orwell", tag: myTag)
let postDescription = firstPost.description()

Thanks, Kyle! Very helpful.