How to Create 2D array in Swift?

Question

Hi there I am new to Swift, I am trying to save Longitude and Latitude and place name from map\'s coordinate object to an Multidimensional array i.e:

Can anyone plea

Answer 1

You can make an array of dictionaries, but I suggest using structs instead.

Array of dictionaries

Create an empty array of dictionaries:

var pinArray = [[String:AnyObject]]()

Append dictionaries to the array:

pinArray.append(["lat":51.130231, "lon":-0.189201, "place":"home"])

pinArray.append(["lat":52.130231, "lon":-1.189201, "place":"office"])

But since your dictionaries hold two types of value (Double and String) it will be cumbersome to get the data back:

for pin in pinArray {
    if let place = pin["place"] as? String {
        print(place)
    }
    if let lat = pin["lat"] as? Double {
        print(lat)
    }
}

So, better use structs instead:

Array of structs

Create a struct that will hold our values:

struct Coordinates {
    var lat:Double
    var lon:Double
    var place:String
}

Create an empty array of these objects:

var placesArray = [Coordinates]()

Append instances of the struct to the array:

placesArray.append(Coordinates(lat: 51.130231, lon: -0.189201, place: "home"))

placesArray.append(Coordinates(lat: 52.130231, lon: -1.189201, place: "office"))

It's then easy to get the values:

for pin in placesArray {
    print(pin.place)
    print(pin.lat)
}