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iOS Object-Oriented Swift Classes in Swift Classes with Custom Types

Posted by Justus Aberson
Justus Aberson
1,035 Points

I don't know what to do next

Hey guys, I did the first part of the question but I don't know what to do as 2nd part. I've tried to creat an instance in Xcode to try, but it didn't work out. I hope anyone can help me what to do.

objects.swift 
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.init(latitude: 0.00 , longitude: 0.00)
    }

}

1 Answer

David Papandrew
David Papandrew
8,386 Points
David Papandrew
David Papandrew
8,386 Points

Hi Justus,

Here is the corrected code, I will try to explain below:

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: "Store XYZ", location: Location(latitude: 10, longitude: 20))

To call the class properties you can do this:

someBusiness.name
someBusiness.location.latitude
someBusiness.location.longitude

Main issue in your code was that you were trying to call Location init in the Business init method. You don't need to do this. Remember, you get a "free" initializer for structs (notice how your struct has no init method but you can still type something like: let someLocation = Location(latitude: 100, longitude: 100) and you can create a new Location instance.

All you need to do is make sure the Business class location property is taking the Location argument being passed in when the Location init is called. (this is the "self.location = location" line.

Hope that helps.