I have an MKAnnotationView (draggable property is set to YES) with a custom image, set via the image property. When the annotation is added to the map it has the custom image. But the image turns back to the default pin when the annotation is dragged. I also tried to overwrite the image propery everytime the dragState changes. No luck here also.
You're using an MKPinAnnotationView instance instead of using an MKAnnotationView instance.
You should use an MKAnnotationView, not a MKPinAnnotationView. Also consider my answer on your other question regarding dragging. Pretty cool stuff.
An MKPinAnnotationView is a ready made annotation view, just like the MKPointAnnotation is a concrete implementation of the MKAnnotation protocol.
These two classes could be used together to get quick, uncustomised results.
I believe you may be using MKPinAnnotationView which will always default to a pin as it's lifecycle occurs.
Related
I am using MKMapView in my iPhone app. I want to implement the pin annotation dragging feature. How can I implement this. The function setCoordinate: shows warning, MKPinAnnotationView may not responds to setCoordinate:. Please help.
That is due to that the MKPinAnnotationView doesn't implement the coordinate, however the annotation does.
Try using:
[pin.annotation setCoordinate:(CLLocationCoordinate2D)];
That should to the trick (given that you call your MKPinAnnotationView for "pin".
I have an MKMapView with several overlays. Works all just fine, and it's incredible how simple it works. There is, however, one thing I can't get to work. The idea is simple: when a user taps within the area that is covered by an overlay, a callout with some information about that overlay has to come up. The overlays are all MKPolygons, which follow the MKOverlay protocol and therefore the MKAnnotation protocol.
The MKOverlay protocol conforms to the
MKAnnotation protocol. As a result,
all overlay objects are also
annotation objects and can be
treated as one or both in your code.
If you opt to treat an overlay object
as both, you are responsible for
managing that object in two places. If
you want to display both an overlay
view and annotation view for it, you
must implement both the
mapView:viewForOverlay: and
mapView:viewForAnnotation: methods in
your application delegate. It also
means that you must add and remove the
object from both the overlays and
annotations arrays of your map.
This comes from the Apple docs. I tried something like this:
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {
MKAnnotationView *aView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:nil];
aView.canShowCallout = YES;
}
But that doesn't seem to work. I've tried using gesture recognizers, but I have no idea how to show a callout other than by using the canShowCallOut property...
I suppose you have to add the MKOverlays as annotations also
[self.mapView addAnnotations:myOverlays];
Then return a MKAnnotationView in (mapView:viewForAnnotation) that's not hidden, either a graphic (tap-able) or zero alpha view. Next, add a UITapGestureRecognizer for each MKOverlayView, make sure it works with the map's gestures (UIGestureRecognizerDelegate implementation for simultaneous recognition). Finally when your gesture recognizer fires do this
[self.mapView setSelectedAnnotations:[NSArray arrayWithObject:myOverlayView.overlay]];
I'm not certain that this actually triggers the callOut showing though.
Also make sure your return title and/or subtitle from your overlay object.
I want to detect tap on annotation pin(of mapkit) so that I can perform action on that event.
Now the default annotation flag pops up in case I touch the annotation pin. I want to customise that to call my method when pin is touched.
You need to implement the following delegate method
(MKAnnotationView) mapView viewForAnnotation:(id) annotation
Then just declare following in this method
MKPinAnnotationView *view=[[MKPinAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:#"abc"];
view.canShowCallout=YES;
view.calloutOffset=CGPointMake(-20,10); //As per your choice
Then you can add UI to your callout eg UIButton or UIImage as
view.rightCalloutAccesoryView
View.leftCalloutAccesoryView
As pin on map is MKAnnotationView you can add UITapGestureRecognizer on it(of yours), but if it already has some GestureRecognizer than you will need to remove it first.
Thanks
I'm displaying a MKMapView with MKAnnotations some of which are selected and showing their Annotation.
I am trying to grab an image of the displayed map and annotations using the -renderInContext.
90% of the time the Map, MKPinAnnotationView's and selected annotations are correctly captured.
The other 10% of the time the image is missing something, usually the MKPinAnnotationViews or their annotations if selected.
I've added code to deal with the Map itself loading it's map data.
But I haven't been able to track down something that would indicate to me that all of the visible MKPinAnnotationView's have been drawn
and if selected their annotations displayed??
the closest hint I've come across is the addObserver, although I haven't figured out what could be observed that would tell me when all of the drawing is done.
Thoughts?
ok I'm an idiot...
I finally tracked down the problem. In my viewForAnnotation routine in the MKMapView Delegate protocol I wasn't correctly setting values for reused MKPinAnnotationView's.
So some of the time I would reuse a view that had .canShowCallout set to YES and other times I'd reuse a view that had .canShowCallout set to NO.
.<
Try using the MKMapViewDelegate didAddAnnotationViews method.
If in that method, the drawing is still not ready for your requirements, you could then in there call your capturing method with performSelector:withObject:afterDelay:.
Is it possible to open simultaneously more then one callout?
The code:
- (void)mapViewDidFinishLoadingMap:(MKMapView *)theMapView {
for (id<MKAnnotation> currentAnnotation in theMapView.annotations) {
[theMapView selectAnnotation:currentAnnotation animated:YES];
}
}
opens only one callout.
Note that there is a method on MKMapView (not MKAnnotationView) for selecting an annotation programmatically that works more or less as you would expect:
- (void)selectAnnotation:(id < MKAnnotation >)annotation animated:(BOOL)animated
However, it automatically deselects any currently annotation at the same time so this doesn't solve your problem.
Oddly, there is a property on MKMapView that appears to hold an array of currently selected annotations:
#property(nonatomic, copy) NSArray *selectedAnnotations
But the documentation on this method says:
"Assigning a new array to this property
selects the first annotation in the
array only."
Just thought this might be of interest.
From a strict API perspective, this does not seem possible.
The -(void)setSelected:(BOOL)selected animated:(BOOL)animated selector on MKAnnotationView states : "You should not call this method directly. An MKMapView object calls this method in response to user interactions with the annotation." so the underlying message is that the selection of annotationView instances in under the full responsability of user selection, and as the user can only select one of them at a time, you shouldn't be able to get several of them selected at the same time.
Even if the documentation says that should not call this method directly, did you try to invoke it anyway with setSelected:YES on several MKAnnotationView instances to see what it gives ?
THE CLEAN WAY I WOULD DO IT : (not tested myself however)
don't rely on the selection mechanism of the MKMapView
subclass the MKAnnotationView to implement a custom one
do the customization in such a way that the callout is part of the annotation view so that you can display several of them.
If you do it like this, you can make appear several callout bubble at the same time and get something that would look like :
alt text http://a1.phobos.apple.com/us/r1000/048/Purple/2b/b2/ec/mzl.ttcsrlee.480x480-75.jpg
Since iOS 11, Apple added new annotation view called MKMarkerAnnotationView.
In func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView?, when you dequeue the annotation view, make sure you cast it as MKMarkerAnnotationView (e.g. var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: identifier) as? MKMarkerAnnotationView), and set view's attributes titleVisibility and subtitleVisibility to .visible.