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

Posted by Andrew Warner
Andrew Warner
4,144 Points

Challenge: Using a Method within a Struct that has a custom Type

For this task, add an instance method to Post.

Name the method description. It takes no parameters and returns a string that describes the post instance. For example given a title: "iOS Development", author: "Apple", and a tag named "swift", the description would read as follows"

"iOSDevelopment by Apple. Filed under swift"

Once you have an instance method, call it on the firstPost instance and assign the result to a constant named postDescription.

When doing this in Playground everything appears to be correct except when returning (tag). When doing string interpolation with tag it returns "IOS Development by Apple. Filed under Tag(name: "Swift")" --- instead of returning simply ---> "IOS Development by Apple. Filed under Swift"

structs.swift 
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)"
    }
}

let firstPost = Post(title: "IOS Development", author: "Apple", tag: Tag(name: "Swift"))
let postDescription = firstPost.description()

1 Answer

Simon Di Giovanni
Simon Di Giovanni
8,429 Points
Simon Di Giovanni
Simon Di Giovanni
8,429 Points

You're so close!!

The reason is is showing as IOS Development by Apple. Filed under Tag(name: "Swift") is because you have asked it to show (tag) in the string, instead of (tag.name)!

You want (tag.name) value, not the whole struct itself!

See the solution below (all i did was change (tag) to ((tag.name)!

Hope this helps.

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: "iOSDevelopment", author: "Apple", tag: Tag(name: "swift"))
let postDescription = firstPost.description()