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

Posted by nicholassnider
nicholassnider
2,568 Points

My code is not compiling even though there is no compiler error and is working in Xcode. Any ideas?

There's no compiler error in treehouse and is doing what the challenge asks for in Xcode. Help!

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: "My First Post", author: "Nick", tag: "new")


let postDescription = firstPost.description()
nicholassnider
nicholassnider
2,568 Points

It simply says "Bummer! Your code could not be compiled. Please click on "Preview" to view the compiler errors." Yet there is no compiler error

Steve Hunter
Steve Hunter
57,712 Points

That's because it isn't passing the tests. It is syntactically correct but incomplete as far as the challenge is concerned.

1 Answer

Steve Hunter
Steve Hunter
57,712 Points

Hi Nicolas,

Which bit isn't working? At first glance, I can see one error; you've not passed a Tag into the init method when you've created firstPost. That should look something like:

let firstPost = Post(title: "Title", author: "Me", tag: Tag(name: "aTag"))

Your init method is expecting a tag: String but the struct has a tag: Tag.

Try correcting that - I'll keep working through the challenge and comparing my code with yours too.

Steve.

Steve Hunter
Steve Hunter
57,712 Points

Right ...

You can't use tag.name in your returned string as you haven't created a Tag instance; you're calling .name on a String. Two things to change; bin the init method. Then, when you create firstPost actually create a Tag and pass that in, like I did above.

Then, your description method should be OK as it can call name on a viable Tag instance.

Make sense?

Steve.

My code: 

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: "Title", author: "Me", tag: Tag(name: "Tag"))
let postDescription = firstPost.description()
Steve Hunter
Steve Hunter
57,712 Points

That's not quite correct; apologies.

The challenge tests are expecting to send a Tag object into the firstPost creation - I don't know why that doesn't get tested in the first part of the challenge, I'll be honest. There must be some semantic test that means your eloquent workaround isn't quite passing the tests as set. There's probably a good reason for that - I just can't see it right now!

nicholassnider
nicholassnider
2,568 Points

Thanks for your help Steve, I got it figured out. I got rid of the init method and called the Tag instance in my firstPost constant. I guess I over-thought it a little.