I have been trying to get multiple map pins to show on the map but it is not working. Can anyone help me out? I am using the code below:
- (void)viewDidLoad
{
// Set some coordinates for our position (Buckingham Palace!)
CLLocationCoordinate2D location;
location.latitude = (double) 51.501468;
location.longitude = (double) -0.141596;
// Add the annotation to our map view
MapViewAnnotation *newAnnotation = [[MapViewAnnotation alloc] initWithTitle:#"Buckingham Palace" andCoordinate:location];
[self.mapView addAnnotation:newAnnotation];
}
- (void)mapView:(MKMapView *)mv didAddAnnotationViews:(NSArray *)views
{
MKAnnotationView *annotationView = [views objectAtIndex:0];
id <MKAnnotation> mp = [annotationView annotation];
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance([mp coordinate], 1500, 1500);
[mv setRegion:region animated:YES];
[mv selectAnnotation:mp animated:YES];
}
Did you set the mapview delegate?
self.mapView.delegate = self;
Related
Is there a way to load the MapView first then fill it with the annotations?
Reason why I ask: When I click on my map which calls my XML first to fill the annotations, there is a delay and only then does the View open with my MapView.
My concerns are that if the XML grows, it would delay even further or timeout.
See this code:
#import "MapViewController.h"
#import "MapViewAnnotation.h"
#implementation MapViewController
#synthesize mapView;
// When the view loads
- (void)viewDidLoad
{
[self performSelector:#selector(addAnnotation) withObject:#"" afterDelay:5.0];
}
//here i am delaying my annotation to 5 second so my map can first display
-(void)addAnnotation
{
// Set some coordinates for our position (Buckingham Palace!)
CLLocationCoordinate2D location;
location.latitude = (double) 51.501468;
location.longitude = (double) -0.141596;
// Add the annotation to our map view
MapViewAnnotation *newAnnotation = [[MapViewAnnotation alloc] initWithTitle:#"Buckingham Palace" andCoordinate:location];
[self.mapView addAnnotation:newAnnotation];
[newAnnotation release];
}
// When a map annotation point is added, zoom to it (1500 range)
- (void)mapView:(MKMapView *)mv didAddAnnotationViews:(NSArray *)views
{
MKAnnotationView *annotationView = [views objectAtIndex:0];
id <MKAnnotation> mp = [annotationView annotation];
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance([mp coordinate], 1500, 1500);
[mv setRegion:region animated:YES];
[mv selectAnnotation:mp animated:YES];
}
// Received memory warning
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
// If the view unloads, release the map view
- (void)viewDidUnload {
[super viewDidUnload];
[mapView release];
mapView = nil;
}
// Deallocations
- (void)dealloc {
[mapView release];
[super dealloc];
}
#end
I've created MKMapView and used UIBarButtonItem for zoom out to show all regions. It worked fine on iPhone Simulator but when I try on device it was zoom back to current location after 3-5 seconds or sometimes 10. I don't know what something wrong here. Thanks for any advice.
This following is my code
MapViewController.h
#import <UIKit/UIKit.h>
#import "MapListViewController.h"
#class MCLocation;
#interface MapViewController : UIViewController <MKMapViewDelegate, CLLocationManagerDelegate, MapListViewControllerDelegate>
{
CLLocationManager *locationManager;
NSArray *locations;
__weak IBOutlet MKMapView *worldView;
__weak IBOutlet UISegmentedControl *mapTypeControl;
}
#property (nonatomic, strong) MCLocation *item;
#property (nonatomic, strong) NSFetchedResultsController *fetchedResultsController;
#property (nonatomic, strong) NSManagedObjectContext *managedObjectContext;
- (IBAction)changeMapType:(id)sender;
- (void)zoomLocation:(CLLocationCoordinate2D)i;
#end
MapViewController.m
#import "MapViewController.h"
#import "MCLocation.h"
#import "MCLocationStore.h"
#import "MapDetailViewController.h"
#define METERS_PER_MILE 1609.344
#interface MapViewController ()
#end
#implementation MapViewController
#synthesize item;
#synthesize fetchedResultsController;
#synthesize managedObjectContext;
- (id)init
{
self = [super initWithNibName:#"MapViewController" bundle:nil];
if (self) {
[[self navigationItem] setTitle:#"Map"];
UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:#"Back" style:UIBarButtonItemStyleBordered target:self action:nil];
[[self navigationItem] setBackBarButtonItem:backButton];
UIImage *userImage = [UIImage imageNamed:#"User.png"];
UIBarButtonItem *leftButton = [[UIBarButtonItem alloc] initWithImage:userImage style:UIBarButtonItemStyleBordered target:self action:#selector(showUser)];
UIImage *locationImage = [UIImage imageNamed:#"Pin.png"];
UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithImage:locationImage style:UIBarButtonItemStyleBordered target:self action:#selector(showLocation)];
[[self navigationItem] setLeftBarButtonItems:leftButton];
[[self navigationItem] setRightBarButtonItems:rightButton];
}
return self;
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
return [self init];
}
- (MKCoordinateRegion)regionForAnnotations:(NSArray *)annotations
{
MKCoordinateRegion region;
if ([annotations count] == 0) {
region = MKCoordinateRegionMakeWithDistance(worldView.userLocation.coordinate, 1000, 1000);
} else if ([annotations count] == 1) {
id <MKAnnotation> annotation = [annotations lastObject];
region = MKCoordinateRegionMakeWithDistance(annotation.coordinate, 1000, 1000);
} else {
CLLocationCoordinate2D topLeftCoord;
topLeftCoord.latitude = -90;
topLeftCoord.longitude = 180;
CLLocationCoordinate2D bottomRightCoord;
bottomRightCoord.latitude = 90;
bottomRightCoord.longitude = -180;
for (id <MKAnnotation> annotation in annotations)
{
topLeftCoord.latitude = fmax(topLeftCoord.latitude, annotation.coordinate.latitude);
topLeftCoord.longitude = fmin(topLeftCoord.longitude, annotation.coordinate.longitude);
bottomRightCoord.latitude = fmin(bottomRightCoord.latitude, annotation.coordinate.latitude);
bottomRightCoord.longitude = fmax(bottomRightCoord.longitude, annotation.coordinate.longitude);
}
MKCoordinateSpan span;
span.latitudeDelta = 2.0;
span.longitudeDelta = 0.5;
region.span = span;
region.center = worldView.userLocation.coordinate;
return [worldView regionThatFits:region];
}
- (IBAction)showUser
{
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(worldView.userLocation.coordinate, 250, 250);
[worldView setRegion:[worldView regionThatFits:region] animated:YES];
}
- (IBAction)showLocation
{
MKCoordinateRegion region = [self regionForAnnotations:locations];
[worldView setRegion:region animated:YES];
}
- (void)updateLocations
{
if (locations != nil) {
[worldView removeAnnotations:locations];
}
locations = [self.fetchedResultsController fetchedObjects];
[worldView addAnnotations:locations];
}
- (void)zoomLocation:(CLLocationCoordinate2D)i
{
CLLocationCoordinate2D zoomLocation = i;
MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(zoomLocation, 0.5*METERS_PER_MILE, 0.5*METERS_PER_MILE);
MKCoordinateRegion adjustedRegion = [worldView regionThatFits:viewRegion];
[worldView setRegion:adjustedRegion animated:YES];
}
- (void)performFetch
{
NSError *error;
if (![self.fetchedResultsController performFetch:&error]) {
FATAL_CORE_DATA_ERROR(error);
return;
}
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
[worldView setShowsUserLocation:YES];
[self performFetch];
[self loadMapTypePref];
[self updateLocations];
// If we have locations, then show them on the map. If there are no
// locations, then let the map view figure out how to center on the
// user's position. It will usually do a pretty good job.
if ([locations count] > 0) {
[self showLocation];
}
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
[mapTypeControl setHidden:YES];
CLLocationCoordinate2D coord = [item coordinate];
[worldView setCenterCoordinate:coord animated:NO];
[self zoomLocation:coord];
}
}
- (void)viewDidUnload
{
worldView = nil;
mapTypeControl = nil;
locations = nil;
fetchedResultsController = nil;
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc
{
[locationManager setDelegate:nil];
}
#pragma mark - MKMapViewDelegate
- (void)mapView:(MKMapView *)mapView
didUpdateUserLocation:(MKUserLocation *)userLocation
{
CLLocationCoordinate2D loc = [userLocation coordinate];
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(loc, 250, 250);
[worldView setRegion:region animated:YES];
}
- (MKAnnotationView *)mapView:(MKMapView *)mapView
viewForAnnotation:(id<MKAnnotation>)annotation
{
static NSString *LocationIdentifier = #"Location";
MKPinAnnotationView *annotationView = (MKPinAnnotationView *)[worldView dequeueReusableAnnotationViewWithIdentifier:LocationIdentifier];
if ([annotation isKindOfClass:[MCLocation class]]) {
if (!annotationView) {
annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:LocationIdentifier];
}
[annotationView setAnnotation:annotation];
[annotationView setPinColor:MKPinAnnotationColorRed];
[annotationView setEnabled:YES];
[annotationView setAnimatesDrop:YES];
[annotationView setCanShowCallout:YES];
[annotationView setCalloutOffset:CGPointMake(-5, 5)];
[annotationView setUserInteractionEnabled:YES];
UIButton *rightButton = nil;
UIImage *logoImage = [UIImage imageNamed:#"monkcup-map-pin.png.png"];
UIImageView *leftButton = [[UIImageView alloc] initWithImage:logoImage];
rightButton = [UIButton buttonWithType:UIButtonTypeInfoLight];
[annotationView setRightCalloutAccessoryView:rightButton];
[annotationView setLeftCalloutAccessoryView:leftButton];
return annotationView;
} else {
[[worldView userLocation] setTitle:#"You're here"];
}
return nil;
}
- (void)mapView:(MKMapView *)mapView
annotationView:(MKAnnotationView *)view
calloutAccessoryControlTapped:(UIControl *)control
{
// Call out code
}
#pragma mark - CLLocationManagerDelegate
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
NSTimeInterval t = [[newLocation timestamp] timeIntervalSinceNow];
if (t < -180) {
return;
}
}
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
//
}
#pragma mark - Fetched results controller
- (NSFetchedResultsController *)fetchedResultsController
{
if (fetchedResultsController) {
return fetchedResultsController;
}
// Create and configure a fetch request with the Book entity.
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
MCLocationStore *ls = [MCLocationStore sharedStore];
self.managedObjectContext = ls.context;
NSEntityDescription *entity = [NSEntityDescription entityForName:#"MCLocation" inManagedObjectContext:self.managedObjectContext];
[fetchRequest setEntity:entity];
// Create the sort descriptors array.
NSSortDescriptor *sd = [NSSortDescriptor sortDescriptorWithKey:#"storeName" ascending:YES];
NSArray *sortDescriptors = [NSArray arrayWithObjects:sd, nil];
[fetchRequest setSortDescriptors:sortDescriptors];
// Create and initialize the fetch results controller.
fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:nil cacheName:#"MapView"];
return fetchedResultsController;
}
#end
You've implemented the map view's didUpdateUserLocation delegate method and in there you are zooming the map to the user's location.
That delegate method will get called whenever the device gets a location update.
So after you zoom or pan away, if there's another location update, the delegate method gets called and it zooms back to the user location.
One option is to keep a boolean ivar (say didZoomToUserLocation) and in that method, you should only zoom (ie. call setRegion) if the flag is NO. Set the flag to YES in that method after calling setRegion.
In iOS 5 and up, you could also try setting the userTrackingMode to MKUserTrackingModeFollow instead of manually zooming. I think that mode gives the user some freedom to pan around while still following the user.
I am new with MapKit and all its functionalities and therefore, stuck at trying to display a pin. I followed an online video tutorial on how to find user current location and drop a pin there. But when I typed the method for the pin, I do not get it at all. I would like to know where did I go wrong for this.
- (void)viewDidLoad{
[super viewDidLoad];
self.title = #"Location";
mapView.showsUserLocation = YES;
self.locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];
[locationManager startUpdatingHeading];
}
-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation{
NSLog(#"Annotation view run");
MKPinAnnotationView *pin = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:#"currentloc"];
pin.animatesDrop = YES;
return pin;
}
-(void) locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{
// once location is determined, center to that location.
location = newLocation.coordinate;
MKCoordinateRegion region;
region.center = location;
MKCoordinateSpan span;
span.latitudeDelta = 0.003;
span.longitudeDelta = 0.003;
region.span = span;
[mapView setRegion:region animated:FALSE];
}
Any advice of where I done wrong would be great!
As your method is never got invoked, you should do:
- (void)mapView:(MKMapView *)aMapView regionDidChangeAnimated:(BOOL)animated {
[aMapView removeAnnotation:[self point]];
mkShape.coordinate = aMapView.centerCoordinate;
[aMapView addAnnotation:mkShape];
}
And you should create your MKAnnotationView properly.
You need create two properties in .h file first (for performance reason):
MKPointAnnotation *mkShape;
MKAnnotationView *annotationView;
then use the code below to create your MKPointAnnotation
- (void)createShape
{
if (!mkShape) {
mkShape = [[MKPointAnnotation alloc] init];
mkShape.title = nil;
mkShape.subtitle = #"test description";
}
}
- (id <MKAnnotation>)point
{
[self createShape];
// Make sure to check if this is an MKPointAnnotation. MKOverlays also
// conform to MKAnnotation, so it isn't sufficient to just check to
// conformance to MKAnnotation.
if ([mkShape isKindOfClass:[MKPointAnnotation class]])
return (id <MKAnnotation>)mkShape;
return nil;
}
- (MKAnnotationView *)annotationView
{
if (!annotationView) {
id <MKAnnotation> annotation = [self point];
if (annotation) {
MKPinAnnotationView *pin =
[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:nil];
pin.canShowCallout = YES;
pin.animatesDrop = YES;
pin.draggable = NO;
annotationView = pin;
}
}
return annotationView;
}
- (MKAnnotationView *)mapView:(MKMapView *)aMapView viewForAnnotation:(id <MKAnnotation>)annotation
{
if ([annotation isEqual:mkShape]) {
return [self annotationView];
}
return nil;
}
At the end, don't forget to release your properties.
- (void)dealloc
{
[annotationView release];
[mkShape release];
[super dealloc];
}
I am new to iPhone programming and I can't understand why the MKAnnotationView is not showing the title's of my annotation's. Below is the code that is used to display it on the map.
- (void)mapView:(MKMapView *)mv didAddAnnotationViews:(NSArray *)views
{
NSLog(#"Entered didAddAnnotationViews");
MKAnnotationView *annotationView = [views objectAtIndex:0];
id <MKAnnotation> mp = [annotationView annotation];
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance([mp coordinate], 250, 250);
[mv setRegion:region animated:YES];
}
Here is where I am defining my annotations:
MapPoint *mp = [[MapPoint alloc]
initWithCoordinate:[newLocation coordinate]
title:[locationTitleField text]];
[mapView addAnnotation:mp];
[mp release];
mp is a class I have created to keep track of all the map points:
#import "MapPoint.h"
#implementation MapPoint
#synthesize coordinate, title;
- (id)initWithCoordinate:(CLLocationCoordinate2D)c title:(NSString *)t
{
[super init];
coordinate = c;
[self setTitle:t];
return self;
}
- (void)dealloc
{
[title release];
[super dealloc];
}
#end
I am beginner so go easy, and all help greatly appreciated.
Mike
Hi
did you look at apple "MapCallouts" example?
you can find it here -
http://developer.apple.com/library/ios/#samplecode/MapCallouts/Introduction/Intro.html
look at it and i would love to help if you have more questions.
shani
i have got the Latitude and Longitude from XML Parsing how can i show MapAnnotation(pin) on the Map,Please help me....
Create a new class that implements the MKAnnotation protocol. This will hold the lat/long, and will also have a title and description which will be displayed if you select the annotation after it has been rendered on your map.
The controller for the view that will display the map will need to implement the - - (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>) annotation; method of the MKMapViewDelegate protocol. The code in this method will look something like the code at the bottom (apologies for the poor formatting, I couldn't get right in here or at the bottom).
Then at some point in your controller code you will need to call something along the lines of [self.mapView addAnnotation: annotation]; where annotation is an instance of your custom annotation class created in step 1, with the lat/long set etc.
Finally, so that the viewForAnnotation method gets called correctly, and is something that is easy to miss, in interface builder, make sure that you set the delegate outlet of the MKMapView to be your controller (that implements the MKMapViewDelegate protocol.
-(MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>) annotation {
static NSString *AnnotationViewIdentifier = #"annotationViewIdentifier";
MKPinAnnotationView *annotationView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier: AnnotationViewIdentifier];
if (annotationView == nil) {
annotationView = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier: AnnotationViewIdentifier] autorelease];
// This is all optional and depends on your requirements
annotationView.animatesDrop = NO;
annotationView.canShowCallout = YES;
annotationView.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
annotationView.enabled = YES;
annotationView.pinColor = MKPinAnnotationColorGreen;
}
return annotationView;
}
First you want to create MKAnnotation Protocol class (Here MyAnnotation class implements the MKAnnotation Protocol).This class should be includes lat, long, title, subtitle and also whatever you want.
Second, In your view controller, where you want to display the pin and you will implement this code,
AnnObj = [[MyAnnotation alloc] init];
AnnObj.latitude = [[latitude objectAtIndex:storyIndex] floatValue];
AnnObj.longitude = [[longitude objectAtIndex:storyIndex] floatValue];
MKCoordinateRegion region;
region.center = location;
MKCoordinateSpan span;
region.center.latitude = [[latitude objectAtIndex:storyIndex] floatValue];
region.center.longitude = [[longitude objectAtIndex:storyIndex] floatValue];
span.latitudeDelta = 0.0005;
span.longitudeDelta = 0.0005;
region.span = span;
[mapview setRegion:region animated:TRUE];
AnnObj.title = titleString;
AnnObj.subTitle = subTitleString;
NSString * titleString = [[buildingNames objectAtIndex:storyIndex] stringByReplacingOccurrencesOfString:#"\n\t" withString:#""];
[eventPoints addObject:AnnObj];
[mapview addAnnotations:eventPoints];
Third, Implement the MKAnnotation delegate method,
- (MKAnnotationView *)mapView: (MKMapView *)lmapView viewForAnnotation:(id <MKAnnotation>) annotation {
if (lmapView.userLocation == annotation){
return nil;
}
MKAnnotationView* myCusAnn = (MKAnnotationView*)[lmapView dequeueReusableAnnotationViewWithIdentifier:#"eventview"];
if(myCusAnn == nil)
{
myCusAnn = [[[ MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:#"eventview"] autorelease];
}
myCusAnn.canShowCallout = YES;
[myCusAnn setEnabled:YES];
return myCusAnn;
}
I hope it will help you.