How To Zoom In Using northeast, southwest and center coordinate In Swiftui Map

Question

chitgoks OP

Created Oct ’22

Replies 1

Boosts 0

Participants 2

I have the coordinate for northeast, southwest and center coordinates for a country Philippines

but it does not zoom in there. This is the code I am using in OnAppear in the map view

@State private var region = MKCoordinateRegion()

var body: some View {
    Map(coordinateRegion: $region)
    .edgesIgnoringSafeArea(.all)
    .onAppear() {
      region = MapTool.getPARCoordinateRegion()
    }
  }

static func getPARCoordinateRegion() -> MKCoordinateRegion {
    let ph = getPHCountryPlaceMark()
    let southWestPoint = MKMapPoint(x: ph.southWestLongitude, y: ph.southWestLatitude)
    let northEastPoint = MKMapPoint(x: ph.northEastLongitude, y: ph.northEastLatitude)
    let northWestPoint = MKMapPoint(x: southWestPoint.x, y: northEastPoint.y)
    let mapRectWidth = northEastPoint.x - northWestPoint.x
    let mapRectHeight = northWestPoint.y - southWestPoint.y
    return MKCoordinateRegion(MKMapRect(x: southWestPoint.x, y: southWestPoint.y, width: mapRectWidth, height: mapRectHeight))
  }

static func getPHCountryPlaceMark() -> CountryPlaceMark {
    let countryPlaceMark = CountryPlaceMark()
    countryPlaceMark.longName = "Philippines"
    countryPlaceMark.shortName = "PH"
    countryPlaceMark.centerLatitude = 12.879721
    countryPlaceMark.centerLongitude = 121.774017
    countryPlaceMark.southWestLatitude = 4.613444
    countryPlaceMark.southWestLongitude = 116.931557
    countryPlaceMark.northEastLatitude = 19.574024
    countryPlaceMark.northEastLongitude = 126.604384
    return countryPlaceMark
  }

But instead zooms here. Thoughts?

Screen Shot 2022-10-08 at 8.18.54 PM.png

Answered by robnotyou in 731835022

Try this:

    static func getPARCoordinateRegion() -> MKCoordinateRegion {
        let ph = getPHCountryPlaceMark()
        let center = CLLocationCoordinate2D(latitude: ph.centerLatitude, longitude: ph.centerLongitude)
        let latitudeDelta = abs(ph.northEastLatitude - ph.southWestLatitude)
        let longitudeDelta = abs(ph.northEastLongitude - ph.southWestLongitude)
        let span = MKCoordinateSpan(latitudeDelta: latitudeDelta, longitudeDelta: longitudeDelta)
        let region = MKCoordinateRegion(center: center, span: span)
        return region
    }

Boost

Answer 1

robnotyou OP

Oct ’22

Accepted Answer

Try this:

    static func getPARCoordinateRegion() -> MKCoordinateRegion {
        let ph = getPHCountryPlaceMark()
        let center = CLLocationCoordinate2D(latitude: ph.centerLatitude, longitude: ph.centerLongitude)
        let latitudeDelta = abs(ph.northEastLatitude - ph.southWestLatitude)
        let longitudeDelta = abs(ph.northEastLongitude - ph.southWestLongitude)
        let span = MKCoordinateSpan(latitudeDelta: latitudeDelta, longitudeDelta: longitudeDelta)
        let region = MKCoordinateRegion(center: center, span: span)
        return region
    }

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