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

Methods

Wonder why this isn't working?

Challenge Task 2 of 2

We learned about instance methods before. 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

/Users/mattconway/Desktop/Screen Shot 2016-01-28 at 6.51.18 PM.png

structs.swift
struct Tag {
    let name: String
}

struct Post {
  let title: String
  let author: String
  let tag: Tag
}
let tagX = Tag(name: "TagX")
let firstPost = Post(title: "Treehouse", author: "Pasan", tag: tagX)
let description = Post(title: "Treehouse", author: "Pasan", tag: tagX) -> [Post] {
print("\("title") by \("author"). Filed under \(tagX)")
}
let postDescription = firstPost

1 Answer

Michael Reining
Michael Reining
10,101 Points

Hi Matt,

  1. The instance method has to be added into the definition of the struct and the syntax to create a method is fun (a method is just like a function)

  2. Make sure the method returns a string

  3. Make sure to return the tag.name and not just the tag object

Once you do the above, you end up with this.

struct Tag {
    let name: String
}

struct Post {
    let title: String
    let author: String
    let tag: Tag
    // create instance method
    func description() -> String { // return string
      return "\(title) by \(author). Filed under \(tag.name)" // return tag.name
    }
}
let tagX = Tag(name: "TagX")
let firstPost = Post(title: "Treehouse", author: "Pasan", tag: tagX)
let postDescription = firstPost.description() // call instance method and assign to constant

I hope that helps,

Mike

PS: Thanks to the awesome resources on Team Treehouse, I launched my first app.

Now you can practice writing Swift code directly on your iPhone :-)

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