how to set up array for multi annotations with swift - ios

Question

How should the array below be set. Im trying to add multiple annotations onto my map. I was able to find the code below on stackoverflow but they did not show how to set up the array.
var objects = [
//how should the array be setup here
]
for objecters in objects!{
if let latit = objecters["Coordinates"]["Latitude"]{
self.latitudepoint = latit as! String
self.map.reloadInputViews()
}
else {
continue
}
if let longi = objecters["Coordinates"]["Longitude"]{
self.longitudepoint = longi as! String
self.map.reloadInputViews()
}
else {
continue
}
var annotation = MKPointAnnotation()
var coord = CLLocationCoordinate2D(latitude: Double(self.latitudepoint)!,longitude: Double(self.longitudepoint)!)
mapView.addAnnotation(annotation)
}

Answer 1

You could do, for example:
let locations = [
["title": "New York, NY", "latitude": 40.713054, "longitude": -74.007228],
["title": "Los Angeles, CA", "latitude": 34.052238, "longitude": -118.243344],
["title": "Chicago, IL", "latitude": 41.883229, "longitude": -87.632398]
]
for location in locations {
let annotation = MKPointAnnotation()
annotation.title = location["title"] as? String
annotation.coordinate = CLLocationCoordinate2D(latitude: location["latitude"] as! Double, longitude: location["longitude"] as! Double)
mapView.addAnnotation(annotation)
}
Or, alternatively, use a custom type, e.g.:
struct Location {
let title: String
let latitude: Double
let longitude: Double
}
let locations = [
Location(title: "New York, NY", latitude: 40.713054, longitude: -74.007228),
Location(title: "Los Angeles, CA", latitude: 34.052238, longitude: -118.243344),
Location(title: "Chicago, IL", latitude: 41.883229, longitude: -87.632398)
]
for location in locations {
let annotation = MKPointAnnotation()
annotation.title = location.title
annotation.coordinate = CLLocationCoordinate2D(latitude: location.latitude, longitude: location.longitude)
mapView.addAnnotation(annotation)
}
Or you can replace that for loop with map:
let annotations = locations.map { location -> MKAnnotation in
let annotation = MKPointAnnotation()
annotation.title = location.title
annotation.coordinate = CLLocationCoordinate2D(latitude: location.latitude, longitude: location.longitude)
return annotation
}
mapView.addAnnotations(annotations)