I have a method that works to move the the map so that it follows the current user location. This works fine, but currently the zoom scale doesn't work how I want. I would like the user to be able to zoom out or zoom in on the map how they want and still have it follow the current location at that NEW zoom scale that the user just set on the map.
I tried to do the following but it doesn't work well:
/**
* Centers the map on the current location
*
* #version $Revision: 0.1
*/
- (void)centerMapOnLocation:(CLLocation *)location {
// Make a region using our current zoom level
CLLocationDistance latitude = mapView.region.span.latitudeDelta*100;
CLLocationDistance longitude = mapView.region.span.longitudeDelta*100;
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(location.coordinate, latitude, longitude);
[mapView setRegion:region animated:YES];
}//end
MKMapView Zoom and Region describes how to get the current view window.
When you're creating the new MKCoordinateRegion to set the new view to, use the constructor that allows you to specify the size:
UIKIT_STATIC_INLINE MKCoordinateRegion MKCoordinateRegionMake(
CLLocationCoordinate2D centerCoordinate,
MKCoordinateSpan span
);
You'll want to pass in the span from the current region and the centerCoordinate from the user location, which I'll take it you already got.
Related
Is it possible using MapKit to show a map in iPhone, like i´m doing, to display zoom controls on the map?
If not, what are the flags or methods i should use to increase and diminish the zoom, so i can created methods which will do this at the push of a button.
There aren't any built-in controls for it.
A couple of suggestions:
You can predefine some spans and store them in an array somewhere and then store your position in that array as well. Zooming in/out changes the position and gets the span.
Zooming in takes the current span and divides by 2, zooming out multiplies by 2.
You change the span in the region of the mapView. So you have to:
Get the region of the mapView.
Get the span of the region.
Change the span to what you want.
Set the regions span to the new span.
Set the mapView's region to the new region.
Here's some code for suggestion 2:
MKCoordinateRegion region = mapView.region;
MKCoordinateSpan span;
span.latitudeDelta = region.span.latitudeDelta*2;
span.longitudeDelta = region.span.longitudeDelta*2;
region.span = span;
[mapView setRegion:region animated:TRUE];
For swift 4, this is what I use:
func zoom(_ zoomin : Bool) {
var region = mapView.region;
var span = MKCoordinateSpan();
span.latitudeDelta = zoomin ? region.span.latitudeDelta / 2 : region.span.latitudeDelta * 2;
span.longitudeDelta = zoomin ? region.span.longitudeDelta / 2 : region.span.longitudeDelta * 2;
region.span = span;
mapView.setRegion(region, animated: true);
}
Off the top of my head I don't remember (at work on a windows box) if there is a switch to display the zoom controls. I assume you are talking about displaying the level of zoom, because by default you can pinch/spread the view for zoom.
If there isn't a switch to display the controls, then you will need to create a custom view layer and put it on top of the mapkit view. Then you will need to call the different functions to change the zoom level.
Those functions are all documented in the mapkit docs. Just do a search for MapKit in the documentation center.
Edit:
http://developer.apple.com/library/ios/#documentation/MapKit/Reference/MKMapView_Class/MKMapView/MKMapView.html#//apple_ref/doc/uid/TP40008205
According to the docs there isn't a switch to display the controls, but the zoom enabled property lets you turn the ability on and off.
So you can subscribe to the delegate function regionWillChange and use the mapView object to get the zoom level and then set your graphics accordingly.
I don't think you should do that, the expected way to zoom in and out is using the pinch gestures. However if you still want to go ahead and do it, you should place yourself the buttons over the MKMapView, and then with those modify the region property of the MKMapView
I am using MKMapView and showing particular point on that map.
There is a button in my screen for finding My Location.now i want that when i click on MyLocation button both the point(My location and another point for particular location) should come in single screen .
****it should be like like : ****
------------------------------
so i have to calculate distance between myLocation (blue) and particular point (Red)
Any help please ?
Something Similar ...
//create new region and set map
CLLocationCoordinate2D coord = {latitude: yourLocation.latitude, longitude: yourLocation.longitude};
MKCoordinateSpan span = MKCoordinateSpanMake(fabs(otherLocation.lattitude), fabs(otherLocation.longitude));
MKCoordinateRegion region = {coord, span};
[self.mapView setRegion:region];
If you want to show Direction in google maps you need current latitude & longitude and particular place lat & long,
Within Button touch action
{
NSURL *strlist = [NSURL URLWithString:[NSString stringWithFormat:#"http://maps.google.com/maps?saddr=%f,%f&daddr=%f,%f",c_lat,c_long,lat,long]];
here //c_lat = current latitude
//c_long = current longitude
//lat = Particular place latitude
//long = Particular place longitude
[[UIApplication sharedApplication]openURL:strlist];
}
If you want to show direction map within app,
Refer this tut
Link for Direction Tut
I have a MKCoordinateregion called region. I want to change span of this region without changing it's center. I am using following method to change zoom.
-(void) changeZoom
{
NSLog(#"before zoom span, center are %f, %f,%f,%f", region.span.latitudeDelta, region.span.longitudeDelta, mymap.centerCoordinate.latitude, mymap.centerCoordinate.longitude);
region.span.latitudeDelta = current_factor ;
region.span.longitudeDelta = current_factor ;
region.center.latitude = mymap.centerCoordinate.latitude ;
region.center.longitude = mymap.centerCoordinate.longitude ;
[mymap setRegion:region animated:TRUE];
NSLog(#"after zoom span, center are %f, %f,%f,%f", region.span.latitudeDelta, region.span.longitudeDelta, mymap.centerCoordinate.latitude, mymap.centerCoordinate.longitude);
}
Log shows :
before zoom span, center are 0.021950, 0.021950,19.068080,72.838111
after zoom span, center are 0.043901, 0.043901,19.068040,72.838154
This method set's span accurately as desired.But I dont want any change in the center's coordinate, Because when I zoom out and then zoom back I end up at a location different from starting location.
Is there any method so that zoom in and out are possible without any change in center?
Thanks for any help in advance.
Your before and after center coordinates are almost exactly the same, so it shouldn't be a problem. If you really want the exact same center coordinates, call setCenterCoordinate:animated: right after you use setRegion:animated: and pass some saved center coordinates.
CLLocationCoordinate2D originalCenter = mymap.centerCoordinate;
// ... adjust region
[mymap setCenterCoordinate:originalCenter animated:NO];
Also, you should use YES instead of TRUE for booleans:
[mymap setRegion:region animated:YES];
You need to adjust the region of the map to make sure the aspect ratio fits the frame size of the map view.
Once the region with the desired center is calculated, adjust the region as,
MKCoordinateRegion adjustedRegion = [mymap regionThatFits:region];
[mymap setRegion:adjustedRegion animated:TRUE];
See docs.
I have one application that shows maps. I need to show current position of user and manage to do that with
[mapView setShowsLocation:YES];
But when I zoom In or zoom Out map it needs a lot of time to show me that blue pin again.
Is it normal or I need to put something else to keep that blue pin on screen all time???
Thanks.
[self setCurrentLocation:self._mapView.userLocation.location.coordinate withZoom:1.0];
self._mapView.showsUserLocation = YES;
- (void)setCurrentLocation:(CLLocationCoordinate2D)coord withZoom:(float)zoomLevel {
MKCoordinateRegion region = self._mapView.region;
region.span.latitudeDelta = self.defaultSpanLevel.latitudeDelta*zoomLevel;
region.span.longitudeDelta = self.defaultSpanLevel.longitudeDelta*zoomLevel;
region.center = coord;
[self._mapView setRegion:region animated:YES];
}
You can use this in view will appear Method
Then You can use mapview delegate methods....
region did change animated:YES { and set map's region here.... take
current user location as region centre.. }
This will solve your problem
}
friends,
i am new to iphone development and just implement google map in iphone application.
now i am facing a problem with following description
i have list of latitude and longitude values when display them on map those pins are displayed on different locations.
now i want to set zoom level so that all pins are displayed on the screen.
any help would be appreciated.
If you're using an MKMapView you can use the setRegion:animated: method to change the region displayed. I would use annotationsInMapRect: to determine which annotations are being shown. Since annotationsInMapRect: returns an NSSet you could make an NSSet of all your annotations, and zoom out the MKMapView until the NSSet returned from annotationsInMapRect: matches your NSSet of all annotations.
The values 3.0 and 2.0 are only examples you can increase or decrease the values according to your requirement(how much you have to zoom) ,map is my mkmapview object
MKCoordinateSpan span;
span.latitudeDelta = 3.0;
span.longitudeDelta = 2.0;
MKCoordinateRegion region;
region.span = span;
[map setRegion:region animated:YES];
[map regionThatFits:region];