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
}
Related
I have a lot of pin annotations on the MKMapView in my app, the iPhone gets very slow and unresponsive when a lot of them are in view on the map. I would like the user to be able to zoom, but not out past a certain level, such as 2km squared or something.
Here's what I've got:
-(void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:YES];
[[BicycleLDNService sharedService] requestLocationForClient:self];
CLLocationCoordinate2D zoomLocation;
CLLocation *deviceLocation = [[BicycleLDNService sharedService] deviceLocation];
zoomLocation.latitude = deviceLocation.coordinate.latitude;
zoomLocation.longitude = deviceLocation.coordinate.longitude;
MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(zoomLocation, 0.5*kMetresPerKilometre, 0.5*kMetresPerKilometre);
MKCoordinateRegion adjustedRegion = [self.mapView regionThatFits:viewRegion];
[self.mapView setRegion:adjustedRegion animated:YES];
self.mapView.zoomEnabled = YES;
}
Is there some sort of property or delegate method I can employ? Couldn't find anything useful on google or here!
Thanks in advance!
The span defines how much of the map at the given point should be visible and is also how you set the zoom level.
You can access this by using
region.span.latitute=0.5;
region.span.longitude=0.6;
Check the zoom level of the map and then set the zoomEnabled Property NO.
mapView.zoomEnabled=NO;
I want to know is it possible to show only specific region on map not the full world map using Map Kit.
Like if i want to show Asia map in my application then map kit hides remaining part of the map.
To handle the "map kit hides remaining part of the map" requirement, one thing you can do is create a black polygon overlay that covers the whole world with a cutout over Asia (or wherever you like).
For example, where you initialize the map (eg. in viewDidLoad):
CLLocationCoordinate2D asiaCoords[4]
= { {55,60}, {55,150}, {0,150}, {0,60} };
//change or add coordinates (and update count below) as needed
self.asiaOverlay = [MKPolygon polygonWithCoordinates:asiaCoords count:4];
CLLocationCoordinate2D worldCoords[4]
= { {90,-180}, {90,180}, {-90,180}, {-90,-180} };
MKPolygon *worldOverlay
= [MKPolygon polygonWithCoordinates:worldCoords
count:4
interiorPolygons:[NSArray arrayWithObject:asiaOverlay]];
//the array can have more than one "cutout" if needed
[myMapView addOverlay:worldOverlay];
and implement the viewForOverlay delegate method:
-(MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id<MKOverlay>)overlay
{
if ([overlay isKindOfClass:[MKPolygon class]])
{
MKPolygonView *pv = [[[MKPolygonView alloc] initWithPolygon:overlay] autorelease];
pv.fillColor = [UIColor blackColor];
pv.alpha = 1.0;
return pv;
}
return nil;
}
This looks like this:
If you also want to restrict the user from scrolling beyond Asia or zooming too far out, then you'll need to do that manually as well. One possible way is described in Restrict MKMapView scrolling. Replace theOverlay in that answer with asiaOverlay.
You can specify the region as an MKCoordinateRegion and then tell an MKMapView instance to only show that region using the setRegion and regionThatFits message.
Alternatively you could use the visibleMapRect property instead of the region. This might better fit your needs.
In short read the MKMapView Class Reference document from Apple.
Lifting from some code I've done in the past that assumes a mapView and a given location called locationToShow I used an MKCoordinateRegion.
- (void) goToLocation {
MKCoordinateRegion region;
MKCoordinateSpan span;
span.latitudeDelta=0.01;
span.longitudeDelta=0.01;
region.span=span;
region.center=locationToShow;
[mapView setRegion:region animated:TRUE];
[mapView regionThatFits:region];
}
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'm using map kit and showing user's location using "showsUserLocation"
I"m using following code to zoom to user's location, but not zooming. Its zooming to some location in Africa, though the user location on map is showing correct.
MKCoordinateRegion newRegion;
MKUserLocation* usrLocation = mapView.userLocation;
newRegion.center.latitude = usrLocation.location.coordinate.latitude;
newRegion.center.longitude = usrLocation.location.coordinate.longitude;
newRegion.span.latitudeDelta = 20.0;
newRegion.span.longitudeDelta = 28.0;
[self.mapView setRegion:newRegion animated:YES];
Why is user's location correctly showing and not zooming properly. Can some one correct me please?
mapView.userLocation is set to a location off the coast of Africa (0,0) when first instantiated. As a result, I do something like the following, which causes the zoom to occur when the annotation appears. Of course, this is just an example:
- (void)mapView:(MKMapView *)mv didAddAnnotationViews:(NSArray *)views {
for(MKAnnotationView *annotationView in views) {
if(annotationView.annotation == mv.userLocation) {
MKCoordinateRegion region;
MKCoordinateSpan span;
span.latitudeDelta=0.1;
span.longitudeDelta=0.1;
CLLocationCoordinate2D location=mv.userLocation.coordinate;
region.span=span;
region.center=location;
[mv setRegion:region animated:TRUE];
[mv regionThatFits:region];
}
}
}
you can try:
mapView.userTrackingMode=YES;
mapView.userTrackingMode=NO;
UserTrackingMode will zoom to user Location.
Have you verified that the location returned by mapView.userLocation isn't at 0, 0?
I want to set a region on my MKMapView and then find the coordinates corresponding to the NE and SW corner of the map.
This code works just fine to do that:
//Recenter and zoom map in on search location
MKCoordinateRegion region = {{0.0f, 0.0f}, {0.0f, 0.0f}};
region.center = mySearchLocation.searchLocation.coordinate;
region.span.longitudeDelta = 0.01f;
region.span.latitudeDelta = 0.01f;
[self.mapView setRegion:region animated:NO]; //When this is set to YES it seems to break the coordinate calculation because the map is in motion
//After the new search location has been added to the map, and the map zoomed, we need to update the search bounds
//First we need to calculate the corners of the map so we get the points
CGPoint nePoint = CGPointMake(self.mapView.bounds.origin.x + mapView.bounds.size.width, mapView.bounds.origin.y);
CGPoint swPoint = CGPointMake((self.mapView.bounds.origin.x), (mapView.bounds.origin.y + mapView.bounds.size.height));
//Then transform those point into lat,lng values
CLLocationCoordinate2D neCoord;
neCoord = [mapView convertPoint:nePoint toCoordinateFromView:mapView];
CLLocation *neLocation = [[CLLocation alloc] initWithLatitude:neCoord.latitude longitude:neCoord.longitude];
CLLocationCoordinate2D swCoord;
swCoord = [mapView convertPoint:swPoint toCoordinateFromView:mapView];
CLLocation *swLocation = [[CLLocation alloc] initWithLatitude:swCoord.latitude longitude:swCoord.longitude];
The problem is I would like the map zoom to be animated. However, when I set the setRegion:animated to YES, I end up getting the coordinates from the map when it's zoomed way out (i.e., before the animation is completed). Is there any way to get a signal that the animation is done?
Never used mapkit but the MKMapViewDelegate has a method mapView:regionDidChangeAnimated: that looks to be what you're looking for.
Be aware that mapView:regionDidChangeAnimated: will get called every time there's a change, such as when the user moves the map.
I know this is super old, but just in case anyone else comes by looking for an answer, here's an alternative.
The nice thing about this version is that you can run a completion animation at the exact moment the first one is complete instead of guessing/hardcoding it in the callback method since that one is called right away.
[MKMapView animateWithDuration:1.0 animations:^{
[mapView setRegion:mapRegion animated:YES];
} completion:^(BOOL finished) {
[UIView animateWithDuration:1.0 animations:^{
self.mapDotsImageView.alpha = 1.0;
}];
}];
or just
// zoom in...
let km3:CLLocationDistance = 3000
let crTight = MKCoordinateRegionMakeWithDistance(location.coordinate, km3, km3)
MKMapView.animate(withDuration: 1.0, animations: { self.theMap.region = crTight })