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iOS Object-Oriented Swift 2.0 Classes Classes with Custom Types

Posted by Fred Lawrence
Fred Lawrence
3,833 Points

Classes with Custom Types

I don't know where I am going wrong. Help. Please.

In the editor you've been provided with a struct named Location that models a coordinate point using longitude and latitude as values.

For this task we want to create a class named Business. The class contains two stored properties: name of type String and location of type Location.

In the initialiser method pass in a name and an instance of Location to set up the instance of Business. Using the initialiser, create an instance and assign it to a constant named Business.

classes.swift 
struct Location {
    let latitude: Double
    let longitude: Double
}

class Business {
   let name: String
   let location: Location


     init() {
  self.location = Location()
  self.name = "HK"

}

let someBusiness = Business()

3 Answers

Rodrigo Chousal
Rodrigo Chousal
16,009 Points
Rodrigo Chousal
Rodrigo Chousal
16,009 Points

Hey Fred,

The init method you wrote is missing arguments. You should have arguments for your init method so you can assign these arguments to the stored properties of your class. Next, when initialising the constant someBusiness, you should input some values to create the instance of Business.

struct Location {
    let latitude: Double
    let longitude: Double
}

class Business {
  let name: String
  let location: Location

  init(name: String, location: Location) {
    self.name = name
    self.location = location
  }

}

let someBusiness = Business(name: "HK", location: Location(latitude: 144.5, longitude: 13.4))

Hope this helps, Rodrigo

Fred Lawrence
Fred Lawrence
3,833 Points
Fred Lawrence
Fred Lawrence
3,833 Points

Very grateful for your help, thanks.

Anthia Tillbury
Anthia Tillbury
3,388 Points
Anthia Tillbury
Anthia Tillbury
3,388 Points

I have the following, and while it will compile in Swift, it will not work on Treehouse's web compiler:

struct Location {
    let latitude: Double
    let longitude: Double


    class Business {
        let name: String
        let location: Location

        init(name: String, latitude: Double, longitude: Double) {
                self.name = name
                self.location = Location(latitude: latitude, longitude: longitude)
        }
    }

    let someBusiness = Business(name: "simon", latitude: 22.2, longitude: 12.0)
}

Anyway, I'm unsure where I am going wrong.

Seth Roope
Seth Roope
6,471 Points
Seth Roope
Seth Roope
6,471 Points

You probably figured this out by now, but the "let someBusiness" declaration should be outside of the "Location" struct.

Cheers