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

Darcy Phillips
Darcy Phillips
4,087 Points
Posted by Darcy Phillips
Darcy Phillips
4,087 Points

Code could not be be compiled, but why?

This code seems to run fine in my playground, but when I paste it into the editor it says it can not be compiled. I don't understand why- I think I've done everything right?

structs.swift 
struct Tag {
    let name: String
}
struct Post {
    let title: String
    let author: String
    let tag: Tag

    init(title: String, author: String, name: String) {
        self.title = title
        self.author = author
        tag = Tag(name: name)
        }
    func description() -> String {
        return "\(title) by \(author). Filed under \(tag.name)"
    }
}
let firstPost = Post(title: "iOSDevelopment", author: "Apple", name: "swift")
let postDescription = firstPost.description()
Darcy Phillips
Darcy Phillips
4,087 Points
Darcy Phillips
Darcy Phillips
4,087 Points

I did update it to be slightly more readable- (in init, changed "name" to "tagName", and of course changed all the subsequent references). But it should be identical to the compiler. (I tried to paste the new code here, but it was ugly, so I deleted).

2 Answers

Anjali Pasupathy
Anjali Pasupathy
28,883 Points
Anjali Pasupathy
Anjali Pasupathy
28,883 Points

You haven't done anything wrong. The challenge just expects the initializer to have a Tag object rather than the String name in its initializer. Because it doesn't see that, it says there's an error, even though there's nothing wrong with your code.

To pass the challenge, you need to pass a Tag object rather than the name in your init method:

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

You also need to instantiate firstPost with a Tag rather than a name String:

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

I hope this helps!

Darcy Phillips
Darcy Phillips
4,087 Points
Darcy Phillips
Darcy Phillips
4,087 Points

Oh, I see! I didn't realize you could run the init method of the struct inside the instantiation procedure. That's cool. Thank you!

(it's a bit frustrating, every time I go back to the challenge, to have to copy and paste my way through the first step, which I've already passed, to try the second step again. Had to do it about 6 times!)

Anjali Pasupathy
Anjali Pasupathy
28,883 Points
Anjali Pasupathy
Anjali Pasupathy
28,883 Points

Yep. You need to run the init method every time you instantiate something - otherwise, the instantiation wouldn't know what the values of its properties are, and the init method would serve no purpose. (:

(I know what you mean. It gets even more frustrating when the challenge stops responding and has to restart! I've gotten into the habit of copying all my code before I check it.)

I'm glad I could help!