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

Aryaman Dhingra
Aryaman Dhingra
3,536 Points
Posted by Aryaman Dhingra
Aryaman Dhingra
3,536 Points

Compiler not showing errors?!

It's saying there is an error, and to check the compiler to see it but it's not being shown. I tried in Xcode and I'm not getting any error there.

structs.swift 
struct Tag {
    let name: String
}

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

    init(name: String, author: String, title: String) {
        self.tag = Tag(name: name)
        self.author = author
        self.title = title
    }
    func description() -> String {
      return "\(title) by \(author) . Filed under \(tag)"
    }
}

let firstPost = Post(name: "Hi", author: "Bye", title: "Lie")

let postDescription = firstPost.description

1 Answer

Greg Kaleka
Greg Kaleka
39,021 Points
Greg Kaleka
Greg Kaleka
39,021 Points

Hi Aryaman,

That error message is not helpful! There are a few things you're doing wrong in your code, and a few things that you should be doing differently (but aren't wrong per se):

  1. There's no need to implement a custom init method. Swift will create an init method on its own. If you don't use the custom init you created, you'll need to pass a Tag object, rather than just the tag name, but still - I think it's clearer than passing a name that isn't actually a Post's name. In a real blog application, you would probably already have tags created, so you don't want to have to create new ones any time you create a post. You'll also have to re-order the arguments to match how you declare them in the struct (title, author, tag).
  2. In your description method, you need to use tag.name, otherwise you'll get the whole Tag object (it will look like this: "...filed under Tag(name: "Hi")". That's not what you want)
  3. You have an extra space in your description (before the period). The code challenge is picky about that.
  4. When you call the description method, you need parentheses. firstPost.description(), not firstPost.description

Seems like a lot of stuff, but I'd say you were actually really close! Hope this all makes sense. Let me know if you have questions or don't quite understand how something is working.

Cheers :beers:

-Greg

solution.swift 
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 firstPost = Post(title: "Lie", author:"Apple", tag: Tag(name: "hi"))

let postDescription = firstPost.description()