How to restrict where users can scroll & zoom to on a map view in iOS

Hi chaps,

Quick one here.

I'm looking to prevent users from scrolling endlessly around a map view in my iOS app.

Also, making sure they can't zoom out too far.

This is the code I'm using to set the default position and zoom level of my map.

var mapview = Map.createView({
    mapType: Map.STANDARD_TYPE,
    region: {
        latitude: 51.535125,
        longitude: -0.154216,
        latitudeDelta: 0.005,
        longitudeDelta: 0.005
    },
    animate: true,
    regionFit: true,
    userLocation: true,
    showsBuildings: false,
    showsPointsOfInterest: false,
    annotations: annotations,
    tintColor:'#6ea108',
    pitchEnabled:false
});

1. Can I set a lat/lon combination which will prevent them from scrolling too far away?

2. Can I set a maximum zoomed out value?

Any help would be greatly appreciated!

Simon