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iOS Build a Simple iPhone App with Swift 2.0 Getting Started with iOS Development Architecture of an iOS App

Posted by Cobie Fisher
Cobie Fisher
4,555 Points

How to extract the value in a struct?

link: https://teamtreehouse.com/library/build-a-simple-iphone-app-with-swift-20/getting-started-with-ios-development/swift-recap-part-1

Current code: 

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: "GoT", author: "GRRM", tag: Tag(name: "Book"))
let postDescription = firstPost.description()

I type this into Xcode and it runs fine, except the value of postDescription is: "My Title by My Author. Filed under Tag(name: "My Tag")" instead of the intended "My Title by My Author. Filed under My Tag". How do I achieve this?

1 Answer

Gareth Borcherds
Gareth Borcherds
9,372 Points
Gareth Borcherds
Gareth Borcherds
9,372 Points

Try instead of tag accessing the name property using tag.name

Cobie Fisher
Cobie Fisher
4,555 Points

Thanks! That's exactly what I needed!

Martina Reiter
Martina Reiter
17,654 Points
Martina Reiter
Martina Reiter
17,654 Points

Hi Gareth, could you please explain why this tag.name? i didnt fully understand that. In my code ( that didnt compile) i used this interpolation:

return "(title) by (author). Filed under (Tag)"

I thought that I could just insert the Tag here as a struct. Obviously I was wrong but I dont get why.

Thanks for your help