I'm trying to set a minimum zoom level on my map in Swift 2. I can't find any documentation on how to restrict a map from being zoomed too far in. What I've decided to try is to monitor for map movement (such as drag or zoom) and then set MKZoomScaleback to a minimum.
Most of the answers I've found for regionDidChangeAnimated are in Objective C, which I don't know and I'm having trouble converting them to Swift.
I tried implementing @hEADcRASH's answer: https://stackoverflow.com/a/30924768/4106552, but it doesn't trigger and print anything to the console when the map is moved in the simulator.
Can anyone tell me what I'm doing wrong? I'm new to Swift, so it could be a small error. Also, let me know if there is a lightweight way to solve for restricting the zoom level on a map. I'm worried that the monitor for movement will slow down the map animation a bit. Thanks for the help.
Here is my view controller. import UIKit import Parse import MapKit
class SearchRadiusViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate {
@IBOutlet weak var map: MKMapView!
@IBOutlet weak var menuBtn: UIBarButtonItem!
var locationManager = CLLocationManager()
override func viewDidLoad() {
super.viewDidLoad()
//menu button control
if self.revealViewController() != nil {
menuBtn.target = self.revealViewController()
menuBtn.action = "revealToggle:"
self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
}
//user location
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.requestWhenInUseAuthorization()
locationManager.startUpdatingLocation()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
//set map
let location:CLLocationCoordinate2D = manager.location!.coordinate
let latitude = location.latitude
let longitude = location.longitude
let latDelta:CLLocationDegrees = 0.1
let longDelta:CLLocationDegrees = 0.1
let span:MKCoordinateSpan = MKCoordinateSpanMake(latDelta, longDelta)
let maplocation:CLLocationCoordinate2D = CLLocationCoordinate2DMake(latitude, longitude)
let region:MKCoordinateRegion = MKCoordinateRegionMake(maplocation, span)
map.setRegion(region, animated: true)
//stop updating location, only need user location once to position map.
manager.stopUpdatingLocation()
}
//Attempt to monitor for map movement based on hEADcRASH's answer.
private var mapChangedFromUserInteraction = false
private func mapViewRegionDidChangeFromUserInteraction() -> Bool {
let view = self.map.subviews[0]
// Look through gesture recognizers to determine whether this region change is from user interaction
if let gestureRecognizers = view.gestureRecognizers {
for recognizer in gestureRecognizers {
if( recognizer.state == UIGestureRecognizerState.Began || recognizer.state == UIGestureRecognizerState.Ended ) {
return true
}
}
}
return false
}
func mapView(mapView: MKMapView, regionWillChangeAnimated animated: Bool) {
print("yes")
mapChangedFromUserInteraction = mapViewRegionDidChangeFromUserInteraction()
if (mapChangedFromUserInteraction) {
// user changed map region
print("user changed map in WILL")
}
}
func mapView(mapView: MKMapView, regionDidChangeAnimated animated: Bool) {
print("yes ddd")
if (mapChangedFromUserInteraction) {
// user changed map region
print("user changed map in Did")
}
}
}
