@Interface MapViewController:UIViewController<CLLocationManagerDelegate> //CLLocationManagerDelegate provides functions to listen to Heading/GPS Change { .... CGRect originalMapViewFrame; // Save the current mapView Size here IBOutlet AGSMapView *mapView; //your AGSMapView Reference... CLLocationManager *locationManager; //locationManager Instance ... } //Serve your LocationManager as retained Property to manage your Memory correctly, don't forgett to release it in your dealloc-Funciton property(retain) CLLocationManager *locationManager; @end
@implementation MapViewController synthesize locationManager; //generate property code ... -(void) startHeading { //locationManager is an Object of Type CLLocationManager -> import CoreLocation if (!self.locationManager) { self.locationManager = [[[CLLocationManager alloc] init]autorelease]; self.locationManager.delegate = self; } // First: Backup current mapview Size. It will be restored on stopHeading CGPoint origin = self.mapView.frame.origin; CGSize size = self.mapView.frame.size; originalMapViewFrame = CGRectMake(origin.x, origin.y, size.width, size.height); //Blow up your map to a Square, this will hide white Areas when rotating your map //The new size will be the diagonal length using Phytagoras... CGFloat newWidth = floor(sqrt(pow(size.width, 2) + pow(size.height, 2))); //Calculate new x and y origins CGFloat x = origin.x - ((newWidth - size.width) /2); CGFloat y = origin.y - ((newWidth - size.height) /2); //Set the new Layoutinformation to your mapView self.mapView.frame = CGRectMake(x, y, newWidth, newWidth); //tell your LocationManager to start the updating [self.locationManager startUpdatingHeading]; } //Will be called from locationManager and updates every Heading Changed -(void) locationManager: (CLLocationManager *)manager didUpdateHeading: (CLHeading *)newHeading { // Get your magneticHeading. If you need the "true" heading, use newHeading.trueHeading instead. But trueHeading only works, if GPS is enabled for your App and your Device is GPS ready... float heading = newHeading.magneticHeading; // You can use this block for smoother Rotation using a UIView Animation [UIView beginAnimations:nil context:UIGraphicsGetCurrentContext()]; [UIView setAnimationCurve:UIViewAnimationCurveLinear]; [UIView setAnimationDuration:0.05]; //make some math (radial to degree or something...) float rotation = -1.0f * M_PI * (heading) / 180.0f; //Apply a rotation Transform to your map self.mapView.transform = CGAffineTransformMakeRotation( rotation); //Commit the animation [UIView commitAnimations]; // if you need actual heading somewhere else, save it. otherwise you don't need this self.heading = rotation; } //Stops heading -(void) stopHeading { [self.locationManager stopUpdatingHeading]; //Remove Rotate Animation self.mapView.transform = CGAffineTransformMakeRotation(0); // Restore original Framedata for your mapView self.mapView.frame = originalMapViewFrame; } @end
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