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iOS

Posted by Joe Dardis
Joe Dardis
1,266 Points

struct method calls

I can't get this to output only "swift". Any suggestions?

struct Tag {
    let name: String
}

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

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

4 Answers

Tassia Castro
.a{fill-rule:evenodd;}techdegree
Tassia Castro
iOS Development Techdegree Student 9,170 Points

Hey Martin Wildfeuer =) sure thing. I added some comments. Hope it got better.

Joe Dardis
Joe Dardis
1,266 Points

Yep! Thanks

Martin Wildfeuer
Martin Wildfeuer
Courses Plus Student 11,071 Points

Perfect! Thank you very much :)

Tassia Castro
seal-mask
.a{fill-rule:evenodd;}techdegree
Tassia Castro
iOS Development Techdegree Student 9,170 Points
Tassia Castro
.a{fill-rule:evenodd;}techdegree
Tassia Castro
iOS Development Techdegree Student 9,170 Points

Hey Joe,

Try this:

struct Tag {
    let name: String
}

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(name: "swift")
    }
    func description() -> String {
        return "\(title) by \(author).  Filed under \(tag.name))" // doing this way you will print only the value of name that is 'swift'
    }
}

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

let postDescription = firstPost.description()
Joe Dardis
Joe Dardis
1,266 Points

Thanks. That works in my playground, but for some reason the code challenge tells me it is incorrect. Here is a link to the code challenge. https://teamtreehouse.com/library/build-a-simple-iphone-app-with-swift-20/getting-started-with-ios-development/swift-recap-part-1

Tassia Castro
seal-mask
.a{fill-rule:evenodd;}techdegree
Tassia Castro
iOS Development Techdegree Student 9,170 Points
Tassia Castro
.a{fill-rule:evenodd;}techdegree
Tassia Castro
iOS Development Techdegree Student 9,170 Points

Ahhh

Try this one then:

struct Tag {
    let name: String
}

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 // Your code was not working because instead of assigning the value tag that you receive in the parameters you were instead creating another Tag. When you created an instance of Post, you were already creating a Tag and passing it as an argument so you did not need to do it again.
    }
    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()
Martin Wildfeuer
Martin Wildfeuer
Courses Plus Student 11,071 Points

Hey Tassia Castro! Thanks for your answer. Would you mind explaining what you changed and why that works compared to your last answer? Code only is a bit like cheating ;)

Joe Dardis
Joe Dardis
1,266 Points

Thanks again, but the code challenge still doesn't like it.... hmmm

Tassia Castro
seal-mask
.a{fill-rule:evenodd;}techdegree
Tassia Castro
iOS Development Techdegree Student 9,170 Points
Tassia Castro
.a{fill-rule:evenodd;}techdegree
Tassia Castro
iOS Development Techdegree Student 9,170 Points

Ohh, it's just a space that was causing the error now..

struct Tag {
    let name: String
}

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)" // just a space between the period and the word Filed that shouldn't be there =)
    }
}

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

let postDescription = firstPost.description()