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

Posted by Ryan West
Ryan West
5,639 Points

Compile problem with no error

in swift i'm getting a compile error but I've ran it in the playground and everything works properly, what am I forgetting on this step?

structs.swift 
struct Tag {
  let name: String
}

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

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

  func description() -> String {

    return "\(title) by \(author). Filed under \(tag)"

  }

}

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

2 Answers

Joe Beltramo
Joe Beltramo
Courses Plus Student 22,191 Points

There are two things incorrect here.

First: Even though your first task passed, the actual intention was for your init method to accept a tag value as a Tag: i.e.

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

Next when you reference the tag in the description output, it is looking for the name of the tag so try:

return "... Filed under \(tag.name)"
Ryan West
Ryan West
5,639 Points

how does the body look in the init method

currently I have:

init(title: String, author: String, tag: Tag){ self.title = title self.author = author //Part i'm stuck: self.tag = Tag(name: "Empty string")??

Joe Beltramo
Joe Beltramo
Courses Plus Student 22,191 Points

Since you are expecting tag to already be set as a Tag in instantiation, you can easily & safely just do

self.tag = tag

But remember to also update your firstPost variable

// This is where you actually create a tag via Tag(name: "swift")
let firstPost = Post(title: "iOS Development", author: "Apple", tag: Tag(name: "swift"))
Ryan West
Ryan West
5,639 Points

Thanks a bunch Joe, that make more sense, I don't know why I was over complicating it.

Joe Beltramo
Joe Beltramo
Courses Plus Student 22,191 Points

Always better to ask than to bang your head on the desk :]

Ahmed Elkasrawi
Ahmed Elkasrawi
2,756 Points
Ahmed Elkasrawi
Ahmed Elkasrawi
2,756 Points

Guys, do you see anything wrong with the code below? it works find on Xcode but the exercise won't compile it.

Thanks

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). Filled under \(tag.name)"
    }
}

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

let postDescription = firstPost.description()
Ryan West
Ryan West
5,639 Points

Hey Ahmed,

Looks like you spelt "Filled" wrong, should be "Filed". Just checked it and it works properly. Try that and let me know what you get.

Cheers, Ryan

Ahmed Elkasrawi
Ahmed Elkasrawi
2,756 Points

Thanks Ryan, that was it.. I was only looking for syntax errors and overlooked my own typos..