Change Pin direction in iOS Map - ios

Question

SWIFT 3.0
MKMAPVIEW
iOS
Note : - (Integrated AppleMap ,Not working with GoogleMap)
I have done the following :
Implemented map and Added custom Image to User Location Annotation
When map open , it shows User Location at right Place
My Requirement :
When User Move into different direction staying at same place (or
different place) the pin (at current location) should automatically
point the direction in which user points.
E.g : If Boat is showing at User Location position and its pointing toward North but if user move toward West then boat (User Location Pin) also should point to that direction.
Tried with following Code :
//MARK:Change Direction Methods
func angle(fromCoordinate first: CLLocationCoordinate2D, toCoordinate second: CLLocationCoordinate2D) -> Float {
let deltaLongitude = second.longitude - first.longitude
let deltaLatitude = second.latitude - first.latitude
let angle = (.pi * 0.5) - atan(deltaLatitude / deltaLongitude)
if deltaLongitude > 0 {
return Float(angle)
}
else if deltaLongitude < 0 {
return Float(angle) + .pi
}
else if deltaLatitude < 0 {
return .pi
}
return 0.0
}
//Animate direction of User Location
func animateUserLocation() {
//Old Coordinate (PLAT - Previous Lat , PLON - Previous Long)
let oldLocation = CLLocationCoordinate2D(latitude: UserDefaults.standard.value(forKey: "PLAT") as! CLLocationDegrees, longitude: UserDefaults.standard.value(forKey: "PLON") as! CLLocationDegrees)
//New Coordinate (PLAT - Current Lat , PLON - Current Long)
let newLocation = CLLocationCoordinate2D(latitude: UserDefaults.standard.value(forKey: "LAT") as! CLLocationDegrees, longitude: UserDefaults.standard.value(forKey: "LON") as! CLLocationDegrees)
let getAngle = angle(fromCoordinate:oldLocation, toCoordinate:newLocation)
var myAnnotation : RestaurantAnnotation?
if annotationArray.count > 0{
myAnnotation = annotationArray[0]
}
else {
return
}
UIView.animate(withDuration: 2, animations: {() -> Void in
myAnnotation?.coordinate = newLocation
let annotationView = self.map.view(for: myAnnotation!)
annotationView?.transform = CGAffineTransform(rotationAngle: CGFloat(getAngle))
})
//Save Previous lat long
UserDefaults.standard.set(UserDefaults.standard.value(forKey: "LAT"), forKey: "PLAT")
UserDefaults.standard.set(UserDefaults.standard.value(forKey: "LON"), forKey: "PLON")
UserDefaults().synchronize()
}
Called animateUserLocation method from didUpdateLocation Method but no Luck.
Kindly share your suggestion what i am doing wrong . Thanks in advance.

Answer 1

Understanding iOS's location concepts completely helps to resolve any issue regarding AppleMap.
To move map Pin or AnnotationView , we can use the CoreLocation framework which outputs data related to the users current location.
import CoreLocation
class ViewController: UIViewController, CLLocationManagerDelegate {
var locationManager:CLLocationManager!
override func viewDidLoad() {
super.viewDidLoad()
locationManager = CLLocationManager()
locationManager.delegate = self
locationManager.startUpdatingHeading()
}
func locationManager(manager: CLLocationManager!, didUpdateHeading heading: CLHeading!) {
// This will print out the direction the device is heading
println(heading.magneticHeading) }
}
}
In the above example, "heading.magneticHeading" will output a value representing the direction the device is pointed at.
0 means north
90 means east
180 means south
270 means west
everything else in between
The next step is to use those values and rotate your AnnotationView or Pin accordingly.
CGAffineTransformMakeRotation can help with this.
For example if you want to rotate to imageview to point to northeast, which would require a degree value of 45, your code might look something like this.
float degrees = 45
imageView.transform = CGAffineTransformMakeRotation(degrees * M_PI/180)
Just be aware that CGAffineTransformMakeRotation() expects a radian value, in the example above we've converted degrees to radians by multiplying degrees with the number of half circles.
Following links really helpful :
https://stackoverflow.com/a/7634232/3400991
Finally Resolved my issue. Hope this complete answer helps other too.