How can I plot addresses in Swift, converting address to longitude and latitude coordinates? - objective-c

Question

In Objective-C this code works fine to plot an address and it finds the longitude and latitude coordinates:
NSString *address = #"1 Infinite Loop, CA, USA";
CLGeocoder *geocoder = [[CLGeocoder alloc] init];
[geocoder geocodeAddressString:address
completionHandler:^(NSArray* placemarks, NSError* error){
// Check for returned placemarks
if (placemarks && placemarks.count > 0) {
CLPlacemark *topResult = [placemarks objectAtIndex:0];
// Create a MLPlacemark and add it to the map view
MKPlacemark *placemark = [[MKPlacemark alloc] initWithPlacemark:topResult];
[self.mapView addAnnotation:placemark];
[placemark release];
}
[geocoder release];
}];
I have been searching for days on how to do this with Swift?! Could anyone point me in the right direction? Could you explain if a user needs an internet connection for this to work. Sorry if these questions sounds a bit basic, but I am quite new to this and learning every day.
I understand that I have to use this code, but cannot find a way to implement it
func geocodeAddressString(_ addressString: String!,
completionHandler completionHandler: CLGeocodeCompletionHandler!)

Answer 1

XCode 9 & Swift 3:
import CoreLocation
let address = "1 Infinite Loop, CA, USA"
let geocoder = CLGeocoder()
geocoder.geocodeAddressString(address, completionHandler: {(placemarks, error) -> Void in
if((error) != nil){
print("Error", error)
}
if let placemark = placemarks?.first {
let coordinates:CLLocationCoordinate2D = placemark.location!.coordinate
}
})

Answer 2

Try something like
var address = "1 Infinite Loop, CA, USA"
var geocoder = CLGeocoder()
geocoder.geocodeAddressString(address, {(placemarks: [AnyObject]!, error: NSError!) -> Void in
if let placemark = placemarks?[0] as? CLPlacemark {
self.mapView.addAnnotation(MKPlacemark(placemark: placemark))
}
})

Answer 3

var address = "1 Infinite Loop, CA, USA"
var geocoder = CLGeocoder()
geocoder.geocodeAddressString(address) {
if let placemarks = $0 {
println(placemarks)
} else {
println($1)
}
}