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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 Carl Smith
Carl Smith
8,185 Points

Not sure how I can pass the Tag into another structure and make it work with an instance?

Not sure how I can pass the Tag into another structure and make it work with an instance?

structs.swift 
struct Tag {
    let name: String
}
struct Post {
    var title: String
    var author: String
    var tag: Tag

    }

let firstPost = Post(title: "title", author: "author", tag: "name")

2 Answers

jcorum
jcorum
71,830 Points

The first step is to create the member variables, which you did. Then you need to create the function the challenge asked for: description(), which takes no parameters, hence the empty parentheses, but does return a String, hence the -> String part. Inside the function you need to write a statement that uses String interpolation and returns that statement when the description() method is called.

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

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

let tag = Tag(name: "swift")
let firstPost = Post(title: "iOS Development", author: "Apple", tag: tag)

let postDescription = firstPost.description()

Note that since the tag member property is of type Tag, you need to create a Tag object, and then use that object when creating a Post object (firstPost).

Carl Smith
Carl Smith
8,185 Points

Thank you! I actually figured it out and am now stuck on the next challenge trying to override a function..

jcorum
jcorum
71,830 Points
jcorum
jcorum
71,830 Points

There's a problem with that challenge. The apostrophe in I'm makes everything you enter look like a comment. But the editor will still take your work. However, it's nicer when you remove it. Re the challenge, here's some help if you want it (spoiler alert!!):

class Robot: Machine {
    override func move (direction: String) {
        switch direction {
        case "Up":
            self.location.y++
        case "Down":
            self.location.y--
        case "Left":
            self.location.x--
        case "Right":
            self.location.x++
        default: break
        }
    }
}