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

Posted by Matt Conway
Matt Conway
1,572 Points

Instance for structure

Got the type String, but cannot put a variable under "tag". It doesn't say in instructions what type it is. Nothing works!

Challenge Task 1 of 2

In the editor you've been provided with a Tag type. Create a struct named Post with three stored properties: title of type String author of type String tag of type Tag

Create an instance of Post and assign it to a constant

named/Users/mattconway/Desktop/Screen Shot 2016-01-28 at 5.40.31 PM.png firstPost.

structs.swift 
struct Tag {
    let name: String
}
struct Post {
  let title: String
  let author: String
  let tag: Tag
}
let firstPost = Post(title: "Treehouse", author: "Pasan", tag: x)

5 Answers

Matthew Spear
Matthew Spear
14,534 Points
Matthew Spear
Matthew Spear
14,534 Points

You need to construct an instance of the tag in the same way in which you construct the Post:

let tagX = Tag(name: "Tag X")

That variable can then be passed into the Post instance since the constant tagX is of type Tag.

Hope that helps, Matt

Matthew Spear
Matthew Spear
14,534 Points
Matthew Spear
Matthew Spear
14,534 Points

Look at this after you've attempted it (more likely to learn that way):

So there are two options here either passing in a variable of type Tag (1) or creating a Tag instance whilst creating the Post Struct (2):

(1):

let tagX = Tag(name: "Tag X")
let firstPost = Post(title: "Treehouse", author: "Pasan", tag: tagX)

(2):

let firstPost = Post(title: "Treehouse", author: "Pasan", tag: Tag(name: "Tag X"))

Either are of which are valid!

Matthew Delange
Matthew Delange
26,584 Points
Matthew Delange
Matthew Delange
26,584 Points

Hey Matt Conway, Not sure if this has been answered correctly for you yet but this worked for me............

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()

alex banaga
alex banaga
310 Points
alex banaga
alex banaga
310 Points

Thank you for this!

Jialong Zhang
Jialong Zhang
9,821 Points
Jialong Zhang
Jialong Zhang
9,821 Points 
struct Tag {
    let name: String
}

struct Post{
    let title: String
    let author: String
    let tag: Tag
}
let firstPost = Post(title: "Bird", author: "May", tag: Tag(name: "tag"))
Lydia Chandrahirawati
Lydia Chandrahirawati
6,336 Points
Lydia Chandrahirawati
Lydia Chandrahirawati
6,336 Points 
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: "iOS Development", author: "Apple", tag: Tag(name: "swift"))

let postDescription = firstPost.description()
Kellington Chidza
Kellington Chidza
866 Points
Kellington Chidza
Kellington Chidza
866 Points

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: "iOS Development", author: "Apple", tag: Tag(name: "swift"))

let postDescription = firstPost.description()