I am using follwing code to show image of the given lat lon value but it gives error
NSString*lat=latitude;
NSString*longi=longitude;
mapView = [[MKMapView alloc] initWithFrame:self.view.bounds];
mapView.mapType = MKMapTypeHybrid;mapView.mapType=MKMapTypeHybrid;
double _lat = [lat doubleValue];
double _lng = [longi doubleValue];
CLLocationCoordinate2D coord = (CLLocationCoordinate2D){_lat, _lng};
MKCoordinateSpan span = (MKCoordinateSpan){0.2, 0.2};
MKCoordinateRegion region = (MKCoordinateRegion){coord, span};
[mapView setRegion:region];
[self.view addSubview:mapView];
Few questions:
NSString*lat=latitude;, what is your latitute, could it be CGFloat or other type?
Could you print the error message that you see?
Have you use the debugger, at which line of code it crashes? I suggest place a breakpoint at the line where: NSString*lat=latitude;
You need to provide more information of the error (if there is anything from the log). "Give and you will receive", thats what my mentor always teach me. Give more information, and you will receive the answer you want.
Related
I have an MKMapView, and I'm trying to set the map, so that when you first load the application it goes to a user set location, and if the user hasn't set one, to a default one. The problem is that it always seems to go to 0 latitude, 0 longitude.
-(void) viewDidLoad {
[worldView setShowsUserLocation:YES];
double longitude = [[NSUserDefaults standardUserDefaults] doubleForKey:WhereamiNewLongPrefKey];
double latitude = [[NSUserDefaults standardUserDefaults] doubleForKey:WhereamiNewLatPrefKey];
CLLocationCoordinate2D savedLoc = CLLocationCoordinate2DMake(latitude, longitude);
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(savedLoc, 250, 250);
NSLog(#"latitude :%f", region.center.latitude);
NSLog(#"longitude :%f", region.center.longitude);
[worldView setRegion:region animated:YES];
}
I've tried setting setShowUserLocation to NO, but that doesn't work. I know it's reading the correct region, because the NSLog is outputing the default latitude, but the map insists on going to somewhere in China...
I've also tried setting the region in mapView:didUpdateUserLocation:, but still the same result.
What am I doing wrong?
EDIT: I added the NSLog to output the longitude as well. The output is:
2012-11-14 09:50:30.699 Whereami[34256:13d03] latitude :20.516700
2012-11-14 09:50:30.699 Whereami[34256:13d03] longitude :99.900000
CLLocationCoordinate2D theCoordinate;
theCoordinate.latitude = 20.516700;
theCoordinate.longitude = 99.900000;
MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(theCoordinate, 1000, 1000);
MKCoordinateRegion adjustedRegion = [self.mapView regionThatFits:viewRegion];
[self.mapView setRegion:adjustedRegion animated:YES];
really strange problem here.
I add 4 annotations (or 15, or 20, I've tried a lot of times) and I only get 2 or max 3 of them showing on the map (random ones).
here is the source:
// [self showRealEstates];
CLLocationCoordinate2D theCoordinate1;
theCoordinate1.latitude = 37.786996;
theCoordinate1.longitude = -122.419281;
CLLocationCoordinate2D theCoordinate2;
theCoordinate2.latitude = 37.810000;
theCoordinate2.longitude = -122.477989;
CLLocationCoordinate2D theCoordinate3;
theCoordinate3.latitude = 37.760000;
theCoordinate3.longitude = -122.447989;
CLLocationCoordinate2D theCoordinate4;
theCoordinate4.latitude = 37.80000;
theCoordinate4.longitude = -122.407989;
MapAnnotationRealEstate* myAnnotation1=[[MapAnnotationRealEstate alloc] initWithCoordinate:theCoordinate1 andTitle:#"Rohan"];
MapAnnotationRealEstate* myAnnotation2=[[MapAnnotationRealEstate alloc] initWithCoordinate:theCoordinate2 andTitle:#"Vaibhav"];
MapAnnotationRealEstate* myAnnotation3=[[MapAnnotationRealEstate alloc] initWithCoordinate:theCoordinate3 andTitle:#"Rituraj"];
MapAnnotationRealEstate* myAnnotation4=[[MapAnnotationRealEstate alloc] initWithCoordinate:theCoordinate4 andTitle:#"Sahil"];
NSMutableArray * annotations = [[NSMutableArray alloc] init];
[annotations addObject:myAnnotation1];
[annotations addObject:myAnnotation2];
[annotations addObject:myAnnotation3];
[annotations addObject:myAnnotation4];
[mapView addAnnotations:annotations];
// [mapView addAnnotation:myAnnotation1];
// [mapView addAnnotation:myAnnotation2];
// [mapView addAnnotation:myAnnotation3];
// [mapView addAnnotation:myAnnotation4];
NSLog(#"annotations: %d", [mapView annotations].count);
The log at the end shows 2, or 3. Don't know what to do, simplified the example as much as I could to eliminate other factors, still getting this.
As We can see the lat/long of these two are pretty close. I believe all the annotations are plotted on map and you are just not able to see from the current zoomlevel.
CLLocationCoordinate2D theCoordinate1;
theCoordinate1.latitude = 37.786996;
theCoordinate1.longitude = -122.419281;
CLLocationCoordinate2D theCoordinate4;
theCoordinate4.latitude = 37.80000;
theCoordinate4.longitude = -122.407989;
They seems to be overlapped in mapview in zoomed out view.
Try zoom-in your map to max level & I believe you will see all 4 annotations.
or you can try by changing the lat/long of one of these annotations.
The below code is what I have used so far, and it loops through every object in the array correctly, but when I try to make them all display on one map it only adds the last obeject in the array to the map, not all 20 or so I want to display.
self.clientTable = [ClientDatabase database].clientTable;
ClientTable *info = nil;
[_nameLabel setText:info.name];
[_stateLabel setText:info.state];
//change the string to doubles for the map GPS co-ordinates
double latDouble = [info.latMap doubleValue];
double longDouble = [info.longMap doubleValue];
NSLog(#"%d",[self.clientTable count]);
int countArray = [self.clientTable count];
for (int i=0;i<countArray;i++) {
info = [self.clientTable objectAtIndex:i];
info.uniqueId=i;
NSLog(#" i = %d ; id = %d %#",i, info.uniqueId, info.name);
//set up the map
[super viewDidLoad];
[mapView setMapType:MKMapTypeStandard];
[mapView setZoomEnabled:YES];
[mapView setScrollEnabled:YES];
MKCoordinateRegion region = {{0.0,0.0},{0.0,0.0}};
region.center.latitude = latDouble;
region.center.longitude = longDouble;
region.span.longitudeDelta =0.02; //degrees of acuracy, most precise best for this time
region.span.latitudeDelta =0.02; //degrees of accuracy
[mapView setRegion:region animated:YES];
// set up the annotation point
AllMap *annotationPoint = [[AllMap alloc] init];
annotationPoint.title = info.name;
annotationPoint.subtitle = info.state;
annotationPoint.coordinate = region.center;
[mapView addAnnotation:annotationPoint];
annotationPoint.isAccessibilityElement=YES;
//show annotation by default
[mapView selectAnnotation:annotationPoint animated:YES];
[mapView setDelegate:self];
}
Sorry if the code is rubbishy, i'm new to iPhone programming.
Thanks in advance :D
It looks like you're calling [super viewDidLoad] inside your for loop, which is probably resetting the mapView's annotations array. This method should only be called once, so if you move it before the for statement you may get better results.
why are you setting up the map inside of the loop where you are creating the annotations?
here is an old blog posting, but it covers the basics and should get you back on track
I have this code to set the map at the user's location:
MKCoordinateSpan span;
span.latitudeDelta=0.2;
span.longitudeDelta=0.2;
CLLocationCoordinate2D location=mapView.userLocation.coordinate;
location = mapView.userLocation.location.coordinate;
MKCoordinateRegion region;
region.span=span;
region.center=location;
[mapView setRegion:region animated:TRUE];
[mapView regionThatFits:region];
Now when I do mapView.showsUserLocation=YES it shows my location at the right place (on my device, and the apple hq in the simulator) however, both times the code above puts me in the sea somewhere near africa!
Any ideas?
The latitude/longitude pair 0/0 is on the equator due south of Greenwich, England. That spot is in the Gulf of Guinea, off the West coast of Africa. If that's where your pin is getting placed, then your mapView.userLocation isn't getting set.
Probably your code here is running before MKMapKit has had a chance to get its location. What you really want to do is have your viewController adopt the MKMapKitDelegate protocol, set the .delegate property of your map view to self, and then implement the method:
- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
That method will get called when the map kit locates the user, and you can use the userLocation value you get passed there to set the region on the map. Until that gets called the first time, though, the MapView is still working on locating itself, and your asking about its location is premature.
Also, your regionThatFits there at the end is a no-op. That method doesn't resize the region in place, it actually returns a resized region, for you to use however you will. So you want to set your map view's region to what that method returns. Like this:
[mapView setRegion:[mapView regionThatFits:region] animated:TRUE];
What I have done was add the following entry on info.plist:
NSLocationAlwaysUsageDescription
Got this info into this (very good) tutorial:
https://www.youtube.com/watch?v=Z272SMC9zuQ
You can choose this method..
- (void)mapView:(MKMapView *)_mapView regionDidChangeAnimated:(BOOL)animated{
CLGeocoder *ceo = [[CLGeocoder alloc]init];
CLLocation *loc = [[CLLocation alloc]initWithLatitude:_mapView.region.center.latitude longitude:_mapView.region.center.longitude];
CLLocationAccuracy accuracy = _mapView.userLocation.location.horizontalAccuracy;
if (accuracy) {
current_pickup_location = loc;
[_currentStreetSpinner startAnimating];
[ceo reverseGeocodeLocation:loc
completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error){
CLPlacemark *placemark = [placemarks objectAtIndex:0];
NSString *locatedAt = [[placemark.addressDictionary valueForKey:#"FormattedAddressLines"] componentsJoinedByString:#", "];
// NSLog(#"location %#",placemark.location);
NSLog(#"I am currently at %#",locatedAt);
_currentStreetLabel.text = locatedAt;
static_iVar = _currentStreetLabel.text;
[_currentStreetSpinner stopAnimating];
[self listDoctorsWithSpeciality_id:currentSpeciality_id
withProfessionalityId:currentProfessionality_id];
}];
}
}
I am answering this question because the answer picked did not really help me and I was having the exact same issue. didUpdateUserLocation is not very practical because it makes the app update every single time the location changes. The other issue with the above solution is that when the map loads it's still too early to ask for a location. So how do you ask for user location before the the map loads so that the zooming doesn't take you to Africa?
You need to request the location by using the location manager on the viewDidLoad. Then after that you can set the region.
SWIFT 3
//top of your class
let locManger = CLLocationManager()
override func viewDidLoad() {
super.viewDidLoad()
//request user location
locManager.startUpdatingLocation()
//this is the code that sets the region based on the location
let span = MKCoordinateSpanMake(0.5, 0.5)
let location = CLLocationCoordinate2DMake((locManager.location?.coordinate.latitude)!, (locManager.location?.coordinate.longitude)!)
let region = MKCoordinateRegionMake(location, span)
yourMap.setRegion(region, animated: false)
//stop location updating
locManager.stopUpdatingLocation()
}
For demonstration purpose, i need to simulate the user location in a Mapkit view.
It seems that it is possible with an undocumented API to place the blue dot anywhere on the map view.
Unfortunately, i don't know witch undocumented API to use ?
Any help ?
Did you set this?
mapView.showsUserLocation = YES;
Setting a specific location is a bit more difficult, but certainly do-able without undocumented APIs. See code below:
- (void)animateToSelectedPlace:(CGFloat)zoomLevel {
MKCoordinateRegion region;
region.center = [self getCoordinateFromComponents:chosenLatitude:chosenLongitude];
MKCoordinateSpan span = {zoomLevel,zoomLevel};
region.span = span;
[mapView setRegion:region animated:YES];
}
-(CLLocationCoordinate2D)getCoordinateFromComponents:(NSNumber*)latitude:(NSNumber*)longitude {
CLLocationCoordinate2D coord;
coord.latitude = latitude.doubleValue;
coord.longitude = longitude.doubleValue;
return coord;
}
Not sure that it is possible to set CUSTOM user location (usually people use image simulating blue user point). Though i am not 100% sure, so you have a chance to try something like this to check if it is possible to deal with userLocation as with MKAnnotation ...
CLLocationCoordinate2D c = self.mapView.userLocation.location.coordinate;
[[self.mapView userLocation] setCoordinate:c];