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iOS Build a Simple iPhone App with Swift 2.0 Getting Started with iOS Development Swift Recap Part 1

Michael Gössl
Michael Gössl
1,275 Points
Posted by Michael Gössl
Michael Gössl
1,275 Points

could not compile

i think my code is right, but it gives me always an error. could someone help me pleas

structs.swift 
struct Tag {
    let name: String
}

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

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

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

let firstPost = Post(title: "iOSDevelopment", author: "Apple", tagi: "swift")
let postDescription = firstPost.description()

2 Answers

Anjali Pasupathy
Anjali Pasupathy
28,883 Points
Anjali Pasupathy
Anjali Pasupathy
28,883 Points

There's really only one problem with your code: in the description function, you need to use tag.name, not tag, in the interpolated string:

return ("\(title) by \(author). Filed under \(tag.name)")

If you make that fix, the code you have written should work fine in Xcode. However, the challenge still won't accept it as a valid answer.

This is because of your Post init method. The quiz compiler expects you to pass in a Tag object when initializing Post, not the name property of a Tag object. It also expects you to use the names "title", "author", and "tag" for the parameter names you're passing into the init method. Because of this, you need to make the following changes to pass:

struct Tag {
    let name: String
}

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

    // 1. CHANGE tagi TO tag
    // 2. CHANGE tag TYPE TO Tag, NOT String
    // 3. CHANGE INITIALIZATION OF self.tag TO REFLECT ABOVE CHANGES
    init(title: String, author: String, tagi: String){
        self.title = title
        self.author = author
        self.tag = Tag(name: tagi)
    }

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

// 4. CHANGE INSTANTIATION OF firstPost TO REFLECT CHANGES MADE IN INIT METHOD
let firstPost = Post(title: "iOSDevelopment", author: "Apple", tagi: "swift")
let postDescription = firstPost.description()

I hope this helps!