Sure this is something simple as I'm just starting with the maps. I already have a map showing one location, but when I've added a second anotation the map stays zoomed all the way out rather than going to my locations. The pins are there when I zoom in, so I know that bit's working.
Code snippets:
- (void)viewDidLoad
{
...
...
...
// Set coordinates for our position
CLLocationCoordinate2D location;
location.latitude = [self.lat doubleValue];
location.longitude = [self.lon doubleValue];
// Add the annotation to our map view
MapViewAnnotation *newAnnotation = [[MapViewAnnotation alloc]
initWithTitle:self.placename
andSubtitle:self.subtitle
andCoordinate:location];
[self.mapView addAnnotation:newAnnotation];
[newAnnotation release];
// Set coordinates for our second position
CLLocationCoordinate2D amenitylocation;
amenitylocation.latitude = self.latitude;
amenitylocation.longitude = self.longitude;
// Add the annotation to our map view
MapViewAnnotation *amenityAnnotation = [[MapViewAnnotation alloc]
initWithTitle:self.callouttitle
andSubtitle:self.calloutsubtitle
andCoordinate:amenitylocation];
[self.mapView addAnnotation:amenityAnnotation];
[amenityAnnotation release];
[super viewDidLoad];
}
#pragma mark - MKMapView Delegates
// 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];
}
- (MKAnnotationView *)mapView:(MKMapView *)mv viewForAnnotation:(id<MKAnnotation>)annotation
{
if(mapView.userLocation==annotation)
{
return nil;
}
NSString *identifier = #"IDENTIFIER";
MKPinAnnotationView *annotationView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:identifier];
if(annotationView==nil)
{
annotationView = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier]autorelease];
annotationView.pinColor=MKPinAnnotationColorPurple;
annotationView.canShowCallout=YES;
}
return annotationView;
}
I'd appreciate any pointers.
Also, am I right in thinking I'll have to make custom callouts if I want more than one to appear on the map at the same time?
Sorry, found the answer - I didn't have the MKMapView delegate linked to File's Owner in IB, although I do have in my header file. Linked that up and it's working.
Related
I'm using Apple's KMLViewer to load a KML file and display it in a MapView. There are over 50,000 lines of coordinates in the KML file which, of course, causes it to load slowly. In an attempt to speed things up, I'm trying to perform the parsing in another thread using GCD.
I have it working reasonably well as far as it is displaying properly and the speed is acceptable. However, I'm getting intermittent runtime errors when loading the map. I suspect it is because the way I have things laid out, the UI is being updated within the GCD block. Everything I'm reading says the UI should be updated in the main thread or else runtime errors can occur which are intermittent and hard to track down. Well, that's what I'm seeing.
The problem is, I can't figure out how to update the UI in the main thread. I'm still new to iOS programming so I'm just throwing things against the wall to see what works. Here is my code, which is basically Apple's KMLViewerViewController.m with some modifications:
#import "KMLViewerViewController.h"
#implementation KMLViewerViewController
- (void)viewDidLoad
{
[super viewDidLoad];
activityIndicator.hidden = TRUE;
dispatch_queue_t myQueue = dispatch_queue_create("My Queue",NULL);
dispatch_async(myQueue, ^{
// Locate the path to the route.kml file in the application's bundle
// and parse it with the KMLParser.
NSString *path = [[NSBundle mainBundle] pathForResource:#"BigMap" ofType:#"kml"];
NSURL *url = [NSURL fileURLWithPath:path];
kmlParser = [[KMLParser alloc] initWithURL:url];
[kmlParser parseKML];
dispatch_async(dispatch_get_main_queue(), ^{
// Update the UI
// Add all of the MKOverlay objects parsed from the KML file to the map.
NSArray *overlays = [kmlParser overlays];
[map addOverlays:overlays];
// Add all of the MKAnnotation objects parsed from the KML file to the map.
NSArray *annotations = [kmlParser points];
[map addAnnotations:annotations];
// Walk the list of overlays and annotations and create a MKMapRect that
// bounds all of them and store it into flyTo.
MKMapRect flyTo = MKMapRectNull;
for (id <MKOverlay> overlay in overlays) {
if (MKMapRectIsNull(flyTo)) {
flyTo = [overlay boundingMapRect];
} else {
flyTo = MKMapRectUnion(flyTo, [overlay boundingMapRect]);
}
}
for (id <MKAnnotation> annotation in annotations) {
MKMapPoint annotationPoint = MKMapPointForCoordinate(annotation.coordinate);
MKMapRect pointRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0, 0);
if (MKMapRectIsNull(flyTo)) {
flyTo = pointRect;
} else {
flyTo = MKMapRectUnion(flyTo, pointRect);
}
}
// Position the map so that all overlays and annotations are visible on screen.
map.visibleMapRect = flyTo;
});
});
}
-(void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
activityIndicator.hidden = FALSE;
[activityIndicator startAnimating];
}
#pragma mark MKMapViewDelegate
- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
{
return [kmlParser viewForOverlay:overlay];
}
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
return [kmlParser viewForAnnotation:annotation];
}
- (void)mapViewDidFinishLoadingMap:(MKMapView *)mapView
{
[activityIndicator stopAnimating];
activityIndicator.hidden = TRUE;
}
#end
Suggestions?
Can anybody help me please? I'm new to xcode and am baffled by what I think is a small problem. For some reason the first time my map is opened from my initial view controller the pin is dropped but the map does not zoom to the correct region even though the latitude and longitude are correct.
When I go back to the first view controller and launch it again the zoom works.
My code is in the view controllers implementation file under viewdidload.
-(void)viewDidLoad {
[super viewDidLoad];
NSLog(#"lat in map %#", eventLat);
NSLog(#"long in map %#", eventLong);
[mapview setMapType:MKMapTypeStandard];
[mapview setZoomEnabled:YES];
[mapview setScrollEnabled:YES];
MKCoordinateRegion region = { {0.0, 0.0 }, {0.0, 0.0 } };
region.center.latitude = [eventLat doubleValue];
region.center.longitude = [eventLong doubleValue];
region.span.latitudeDelta = 0.01f;
region.span.longitudeDelta = 0.01f;
[mapview setRegion:region animated:YES];
MMAnnotate *ann = [[MMAnnotate alloc] init];
ann.title = #"Test Title";
ann.subtitle = #"Test Subtitle";
ann.coordinate = region.center;
[mapview addAnnotation:ann];
}
You should try doing that in viewDidAppear instead. If you're prepared for it to zoom to that location every time the view appears. viewDidLoad is too early in the mapview cycle.
I've spent many hours trying to figure how to do this:
Having a placemark/annotation in the centerCoordinate of your mapView, when you scroll the map, the placemark should always stays in the center.
I've seen another app doing this too!
Found my question in How to add annotation on center of map view in iPhone?
There's the answer :
If you want to use an actual annotation instead of just a regular view positioned above the center of the map view, you can:
use an annotation class with a settable coordinate property (pre-defined MKPointAnnotation class eg). This avoids having to remove and add the annotation when the center changes.
create the annotation in viewDidLoad
keep a reference to it in a property, say centerAnnotation
update its coordinate (and title, etc) in the map view's regionDidChangeAnimated delegate method (make sure map view's delegate property is set)
Example:
#interface SomeViewController : UIViewController <MKMapViewDelegate> {
MKPointAnnotation *centerAnnotation;
}
#property (nonatomic, retain) MKPointAnnotation *centerAnnotation;
#end
#implementation SomeViewController
#synthesize centerAnnotation;
- (void)viewDidLoad {
[super viewDidLoad];
MKPointAnnotation *pa = [[MKPointAnnotation alloc] init];
pa.coordinate = mapView.centerCoordinate;
pa.title = #"Map Center";
pa.subtitle = [NSString stringWithFormat:#"%f, %f", pa.coordinate.latitude, pa.coordinate.longitude];
[mapView addAnnotation:pa];
self.centerAnnotation = pa;
[pa release];
}
- (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated {
centerAnnotation.coordinate = mapView.centerCoordinate;
centerAnnotation.subtitle = [NSString stringWithFormat:#"%f, %f", centerAnnotation.coordinate.latitude, centerAnnotation.coordinate.longitude];
}
- (void)dealloc {
[centerAnnotation release];
[super dealloc];
}
#end
Now this will move the annotation but not smoothly. If you need the annotation to move more smoothly, you can add a UIPanGestureRecognizer and UIPinchGestureRecognizer to the map view and also update the annotation in the gesture handler:
// (Also add UIGestureRecognizerDelegate to the interface.)
// In viewDidLoad:
UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(handleGesture:)];
panGesture.delegate = self;
[mapView addGestureRecognizer:panGesture];
[panGesture release];
UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:#selector(handleGesture:)];
pinchGesture.delegate = self;
[mapView addGestureRecognizer:pinchGesture];
[pinchGesture release];
- (void)handleGesture:(UIGestureRecognizer *)gestureRecognizer
{
centerAnnotation.coordinate = mapView.centerCoordinate;
centerAnnotation.subtitle = [NSString stringWithFormat:#"%f, %f", centerAnnotation.coordinate.latitude, centerAnnotation.coordinate.longitude];
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
//let the map view's and our gesture recognizers work at the same time...
return YES;
}
i am working with Mapkit and i am on SDK 4.2, i am having a strange bug here, in fact i have 3 annotation types, "blue.png", red.png,black.png. I am loading these by a flux and depending on the type its will select these annotation types. Everything works fine when the map is loaded i have the the different annotation view, but when i move , zoom in or zoom out the annotation view changes i.e where it was supposed to be blue.png it becomes black.png.
I am actually testing it on device.
Thank you very much :)
Hey veer the problem is that this method is called if the user pans the map to view another location and then comes back to the place where the annotations are plotted.
- (MKAnnotationView *)mapView:(MKMapView *)mapview viewForAnnotation:(id <MKAnnotation>)annotation
I have seen many sample code for map application and this in what most of the people are using.
- (MKAnnotationView *)mapView:(MKMapView *)mapview viewForAnnotation:(id <MKAnnotation>)annotation
{
if ([annotation isKindOfClass:[MKUserLocation class]])
return nil;
static NSString* AnnotationIdentifier = #"AnnotationIdentifier";
MKAnnotationView *annotationView = [mapView dequeueReusableAnnotationViewWithIdentifier:AnnotationIdentifier];
if(annotationView)
return annotationView;
else
{
MKPinAnnotationView* pinView = [[[MKPinAnnotationView alloc]
initWithAnnotation:annotation reuseIdentifier:AnnotationIdentifier] autorelease];
pinView.animatesDrop=YES;
pinView.canShowCallout=YES;
pinView.draggable = YES;
pinView.pinColor = MKPinAnnotationColorGreen;
return pinView;
}
return nil;
}
i found the solution - in fact i am using a custom annotation view and having 3 diff types of images :
Soln:
- (AnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
AnnotationView *annotationView = nil;
// determine the type of annotation, and produce the correct type of annotation view for it.
AnnotationDetails* myAnnotation = (AnnotationDetails *)annotation;
if(myAnnotation.annotationType == AnnotationTypeGeo)
{
// annotation for your current position
NSString* identifier = #"geo";
AnnotationView *newAnnotationView = (AnnotationView *)[self.mapView dequeueReusableAnnotationViewWithIdentifier:identifier];
if(nil == newAnnotationView)
{
newAnnotationView = [[[AnnotationView alloc] initWithAnnotation:myAnnotation reuseIdentifier:identifier] autorelease];
}
annotationView = newAnnotationView;
}
else if(myAnnotation.annotationType == AnnotationTypeMyfriends)
{
NSString* identifier = #"friends";
AnnotationView *newAnnotationView = (AnnotationView *)[self.mapView dequeueReusableAnnotationViewWithIdentifier:identifier];
if(nil == newAnnotationView)
{
newAnnotationView = [[[AnnotationView alloc] initWithAnnotation:myAnnotation reuseIdentifier:identifier] autorelease];
}
annotationView = newAnnotationView;
}
}
I am trying to capture tap event on my MKMapView, this way I can drop a MKPinAnnotation on the point where user tapped. Basically I have a map overlayed with MKOverlayViews (an overlay showing a building) and I would like to give user more information about that Overlay when they tap on it by dropping a MKPinAnnotaion and showing more information in the callout.
Thank you.
You can use a UIGestureRecognizer to detect touches on the map view.
Instead of a single tap, however, I would suggest looking for a double tap (UITapGestureRecognizer) or a long press (UILongPressGestureRecognizer). A single tap might interfere with the user trying to single tap on the pin or callout itself.
In the place where you setup the map view (in viewDidLoad for example), attach the gesture recognizer to the map view:
UITapGestureRecognizer *tgr = [[UITapGestureRecognizer alloc]
initWithTarget:self action:#selector(handleGesture:)];
tgr.numberOfTapsRequired = 2;
tgr.numberOfTouchesRequired = 1;
[mapView addGestureRecognizer:tgr];
[tgr release];
or to use a long press:
UILongPressGestureRecognizer *lpgr = [[UILongPressGestureRecognizer alloc]
initWithTarget:self action:#selector(handleGesture:)];
lpgr.minimumPressDuration = 2.0; //user must press for 2 seconds
[mapView addGestureRecognizer:lpgr];
[lpgr release];
In the handleGesture: method:
- (void)handleGesture:(UIGestureRecognizer *)gestureRecognizer
{
if (gestureRecognizer.state != UIGestureRecognizerStateEnded)
return;
CGPoint touchPoint = [gestureRecognizer locationInView:mapView];
CLLocationCoordinate2D touchMapCoordinate =
[mapView convertPoint:touchPoint toCoordinateFromView:mapView];
MKPointAnnotation *pa = [[MKPointAnnotation alloc] init];
pa.coordinate = touchMapCoordinate;
pa.title = #"Hello";
[mapView addAnnotation:pa];
[pa release];
}
I setup a long press (UILongPressGestureRecognizer) in viewDidLoad: but it just detect the only one touch from the first.
Where can i setup a long press to detect all touch? (it means the map ready everytime waiting user touch to screen to push a pin)
The viewDidLoad: method!
- (void)viewDidLoad {
[super viewDidLoad];mapView.mapType = MKMapTypeStandard;
UILongPressGestureRecognizer *longPressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:#selector(handleLongPressGesture:)];
[self.mapView addGestureRecognizer:longPressGesture];
[longPressGesture release];
mapAnnotations = [[NSMutableArray alloc] init];
MyLocation *location = [[MyLocation alloc] init];
[mapAnnotations addObject:location];
[self gotoLocation];
[self.mapView addAnnotations:self.mapAnnotations];
}
and the handleLongPressGesture method:
-(void)handleLongPressGesture:(UIGestureRecognizer*)sender {
// This is important if you only want to receive one tap and hold event
if (sender.state == UIGestureRecognizerStateEnded)
{NSLog(#"Released!");
[self.mapView removeGestureRecognizer:sender];
}
else
{
// Here we get the CGPoint for the touch and convert it to latitude and longitude coordinates to display on the map
CGPoint point = [sender locationInView:self.mapView];
CLLocationCoordinate2D locCoord = [self.mapView convertPoint:point toCoordinateFromView:self.mapView];
// Then all you have to do is create the annotation and add it to the map
MyLocation *dropPin = [[MyLocation alloc] init];
dropPin.latitude = [NSNumber numberWithDouble:locCoord.latitude];
dropPin.longitude = [NSNumber numberWithDouble:locCoord.longitude];
// [self.mapView addAnnotation:dropPin];
[mapAnnotations addObject:dropPin];
[dropPin release];
NSLog(#"Hold!!");
NSLog(#"Count: %d", [mapAnnotations count]);
}
}
If you want to use a single click/tap in the map view, here's a snippet of code I'm using. (Cocoa and Swift)
let gr = NSClickGestureRecognizer(target: self, action: "createPoint:")
gr.numberOfClicksRequired = 1
gr.delaysPrimaryMouseButtonEvents = false // allows +/- button press
gr.delegate = self
map.addGestureRecognizer(gr)
in the gesture delegate method, a simple test to prefer the double-tap gesture …
func gestureRecognizer(gestureRecognizer: NSGestureRecognizer, shouldRequireFailureOfGestureRecognizer otherGestureRecognizer: NSGestureRecognizer) -> Bool {
let other = otherGestureRecognizer as? NSClickGestureRecognizer
if (other?.numberOfClicksRequired > 1) {
return true; // allows double click
}
return false
}
you could also filter the gesture in other delegate methods if you wanted the Map to be in various "states", one of which allowed the single tap/click
For some reason, the UIGestureRecognizer just didn't work for me in Swift. When I use the UIGestureRecognizer way. When I used the touchesEnded method, it returns a MKNewAnnotationContainerView. It seems that this MKNewAnnotationContainerView blocked my MKMapView. Fortunately enough, it's a subview of MKMapView. So I looped through MKNewAnnotationContainerView's superviews till self.view to get the MKMapView. And I managed to pin the mapView by tapping.
Swift 4.1
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
let t = touches.first
print(t?.location(in: self.view) as Any)
print(t?.view?.superview?.superview.self as Any)
print(mapView.self as Any)
var tempView = t?.view
while tempView != self.view {
if tempView != mapView {
tempView = tempView?.superview!
}else if tempView == mapView{
break
}
}
let convertedCoor = mapView.convert((t?.location(in: mapView))!, toCoordinateFrom: mapView)
let pin = MKPointAnnotation()
pin.coordinate = convertedCoor
mapView.addAnnotation(pin)
}