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

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

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

Thanks! That's exactly what I needed!

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