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

Jose Frometa
Jose Frometa
206 Points
Posted by Jose Frometa
Jose Frometa
206 Points

editor does not displays the error...

i dont understand why its not good and the output screen its not helping at all because never displays the output

structs.swift 
import Foundation

struct Tag {
    var name : String = "name"

    init(_ name : String) {
        self.name = name
    }

}

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

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

    func description() -> String {
        return  self.title + " by " + self.author + ". Filed under " + self.tag.name
    }

}

var firstPost : Post = Post("Hola")

1 Answer

Steven Deutsch
Steven Deutsch
21,046 Points
Steven Deutsch
Steven Deutsch
21,046 Points

Hey Jose Frometa,

I would remove the default values provided in the initializers for some of the properties of Post and Tag. If you want to use a default value for a property, do it when you define the property and not during initialization. However, I wouldn't recommend using default values for these properties.

Let's look at what these changes:

import Foundation

struct Tag {
    var name: String

    /* Structs get a memberwise initializer by default
         so we don't need to define one here. */
}

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

    /* Here the memberwise initializer for Post would require us
        to call the Tag initializer inside of it, let's provide a better initializer. 

        Since the Tag initializer ultimately wants a string, let's declare the type
        for the 3rd parameter as a String. Then we can call
        the Tag initializer from inside the Post initializer 
        and pass it the value.   
   */

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

    func description() -> String {
        return  self.title + " by " + self.author + ". Filed under " + self.tag.name
    }
}
// Use let not var
let firstPost: Post = Post(title: "iOSDevelopment", author: "Apple", tagName: "Swift")