How to fix this 'Invalid Region <center:-180.00000000, -180.00000000 span:nan, nan>' error in swift

Question

I would like to get the region so I can fit the annotations inside of it. But I got uncaught exception 'NSInvalidArgumentException', reason: 'Invalid Region '. So how cloud I resolve this problem please ?

var topLeftCoordinate = CLLocationCoordinate2D(latitude: -90, longitude: 180)
var bottomRightCoordinate = CLLocationCoordinate2D(latitude: 90, longitude: -180)

for annotation in mapView.annotations where !annotation.isKind(of: DriverAnnotation.self){
            topLeftCoordinate.longitude = fmin(topLeftCoordinate.longitude, annotation.coordinate.longitude)
            topLeftCoordinate.latitude = fmax(topLeftCoordinate.latitude, annotation.coordinate.latitude)
            bottomRightCoordinate.longitude = fmin(bottomRightCoordinate.longitude, annotation.coordinate.longitude)
            bottomRightCoordinate.latitude = fmax(bottomRightCoordinate.latitude, annotation.coordinate.latitude)
        }

var region = MKCoordinateRegion(center: CLLocationCoordinate2DMake(topLeftCoordinate.latitude - (topLeftCoordinate.latitude - bottomRightCoordinate.latitude) * 0.5, topLeftCoordinate.longitude + (bottomRightCoordinate.longitude - topLeftCoordinate.longitude) * 0.5), span: MKCoordinateSpan(latitudeDelta: fabs(topLeftCoordinate.latitude - bottomRightCoordinate.latitude) * 2.0, longitudeDelta: fabs(bottomRightCoordinate.longitude - topLeftCoordinate.longitude) * 2.0))

region = mapView.regionThatFits(region) mapView.setRegion(region, animated: true)

Your coords are backwards. Top left should be 90, -180 and bottom right should be -90, 180. — rmaddy
@rmaddy I just tried your solution but it give me the same error back — Mexicaneezy

vadian vadian · Accepted Answer · 2019-05-10T17:05:39

This is the wrong way to calculate the rectangle which fits the bounds of all annotations.

Use this, it maps the annotations to their coordinates and then to MKMapRect instances. The reduce/union function calculates the size of the rect

let coordinates = mapView.annotations.lazy.filter{!($0 is DriverAnnotation)}.map{ $0.coordinate }
let rects = coordinates.map { MKMapRect(origin: MKMapPoint($0), size: MKMapSize()) }
let mapRect = rects.reduce(MKMapRect.null) { $0.union($1) }
mapView.setVisibleMapRect(mapRect, animated: true)

Or, much simpler (thanks to Sulthan)

let annotations = mapView.annotations.filter{!($0 is DriverAnnotation)}
mapView.showAnnotations(annotations, animated: true)

How to fix this 'Invalid Region <center:-180.00000000, -180.00000000 span:nan, nan>' error in swift

1 Answers