mapkit zoom to maximum scale objective c

Question

I am using mapkit .I have developed simple storyboard application .

1-The mapkit should zoom to maximum scale to show user location on loading mapkit.

2-On clicking loc.png the map should load the description of location with title and subtitle and detail about location

- (nullable MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
    MKAnnotationView * annotationView = [mapView dequeueReusableAnnotationViewWithIdentifier:@"testAnnotationView"];
    if(annotationView == nil){
        annotationView = [[MKAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:@"testAnnotationView"];
        annotationView.image = [UIImage imageNamed:@"loc.png"];
        annotationView.canShowCallout = true;
    }

    return annotationView;
}

How i can accomplish these task?From this link you can download sample project.https://drive.google.com/file/d/0B5pNDpbvZ8SnRExkamtmdkwzeWc/view?usp=sharing

Answer 1

Use this extension of mapKit, and adjust the values as you need, if the values is lower the the zoom is greater

EDITED

OBJECTIVE-C

.h

#import <MapKit/MapKit.h>

@interface MKMapView (Zoom)

-(void)zoomToUserLocation;

-(void)zoomToUserLocationWith:(CLLocationCoordinate2D)coordinate and:(CLLocationDistance)latitudinalMeters and:(CLLocationDistance)longitudinalMeters;

-(void)zoomToUserLocationWith:(CLLocationDistance)latitudinalMeters and:(CLLocationDistance)longitudinalMeters;

@end

.m

#import "MKMapView+Zoom.h"

@implementation MKMapView (Zoom)

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
}
*/

-(void)zoomToUserLocation
{
    [self zoomToUserLocationWith:1000 and:1000];
}

-(void)zoomToUserLocationWith:(CLLocationCoordinate2D)coordinate and:(CLLocationDistance)latitudinalMeters and:(CLLocationDistance)longitudinalMeters
{
    [self setRegion:MKCoordinateRegionMakeWithDistance(coordinate, latitudinalMeters, longitudinalMeters)];
}

-(void)zoomToUserLocationWith:(CLLocationDistance)latitudinalMeters and:(CLLocationDistance)longitudinalMeters
{
    if(self.userLocation.location != nil){
        [self zoomToUserLocationWith:self.userLocation.location.coordinate and:latitudinalMeters and:longitudinalMeters];
    }
}
@end

use it

[self.mapView zoomToUserLocation];

or

[self.mapView zoomToUserLocationWith:50 and:50];

or you can use it in

- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view{
    [mapView zoomToUserLocationWith:view.annotation.coordinate and:500 and:500];
}

SWIFT

  extension MKMapView {
  func zoomToUserLocation() {
     self.zoomToUserLocation(latitudinalMeters: 1000, longitudinalMeters: 1000)
  }

  func zoomToUserLocation(latitudinalMeters:CLLocationDistance,longitudinalMeters:CLLocationDistance)
  {
    guard let coordinate = userLocation.location?.coordinate else { return }
    let region = MKCoordinateRegionMakeWithDistance(coordinate, latitudinalMeters, longitudinalMeters)
    setRegion(region, animated: true)
  }

}

Use it

mapView.zoomToUserLocation()

or

mapView.zoomToUserLocation(latitudinalMeters:50,longitudinalMeters:50)

Hope this helps