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

Matthew Phillips
PLUS
Matthew Phillips
Courses Plus Student 6,271 Points
Posted by Matthew Phillips
Matthew Phillips
Courses Plus Student 6,271 Points

Cannot get challenge to pass

Hello,

I am trying to get the challenge to pass, (Second Step) but I am not having much look, I think I am missing something, but I have copied it into a xcode playground and it is not showing any errors, and shows the correct result.

Does anyone know where I am going wrong?

Thanks Matthew

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.name)"
    }
}
let tagging = Tag(name: "Swift")
let firstPost = Post(title: "iOSDevelopment", author: "Apple", tag:tagging)
let postDescription = firstPost.description()

3 Answers

Raul Martin
Raul Martin
2,312 Points
Raul Martin
Raul Martin
2,312 Points

You are right Mattew, you only need to specity the init on a class. Its done automatically under the hood for Structs.

And yeah, the issues were only about spacing... I keep making those myself.

Cheers

Yusuf Akbar
Yusuf Akbar
2,457 Points
Yusuf Akbar
Yusuf Akbar
2,457 Points

Hello Matthew,

Great job so far, all seems to be correct. You are however missing the init methods for both structs.
This should help:

struct Tag { let name: String

init(name: String) {
    self.name = name
}

}

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

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

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

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

Try pasting this into the challenge, it should pass.

Yusuf Akbar
Yusuf Akbar
2,457 Points
Yusuf Akbar
Yusuf Akbar
2,457 Points

My apologies for the formatting of the answer, not sure why it's splitting the code up.

Matthew Phillips
Matthew Phillips
Courses Plus Student 6,271 Points
Matthew Phillips
Matthew Phillips
Courses Plus Student 6,271 Points

Thanks Yusuf.

Just managed to work it out, I needed to remove a space on my func description() -> String, between description and ().

Thanks for your reply though. Much appreciated.

As a side question (i'm just learning Swift, so could be totally wrong) I thought Structs had a inferred Init if you do not specify one, and you only needed to specify a init on a class, is this not correct?

Yusuf Akbar
Yusuf Akbar
2,457 Points
Yusuf Akbar
Yusuf Akbar
2,457 Points

Always a pleasure.

I have also just started with Swift and when I got to this challenge, I too was a bit confused, still am actually. I am hoping that someone with a bit more experience can explain why :)