I have a MKMapView in my app with several pins on it and I'd like to set different colors for each pin. My view controller is implementing MKMapViewDelegate and I've defined viewForAnnotation method.
- (MKAnnotationView *) mapView:(MKMapView *)mapView
viewForAnnotation:(id <MKAnnotation>) annotation {
MKPinAnnotationView *annView=[[MKPinAnnotationView alloc]
initWithAnnotation:annotation reuseIdentifier:#"pin"];
annView.pinColor = MKPinAnnotationColorGreen;
return annView;
}
It works fine and changes pin color to green. However the color is changed for all pins and I'd like to color them with several colors (based on some criteria I'd define, lets assume I want to have odd pins green and even pins yellow or something as simple as that). How can this be achieved?
I've solved this issue by using images instead of pinColor. This way I can have as many pins as I want.
if(annotation.fillsYourCriteria)
annView.pinColor = MKPinAnnotationColorGreen;
else
annView.pinColor = MKPinAnnotationColorYellow;
return annView;
Something as simple as that?
I have met the same issue then I solved by using this code
if([[pinView.annotation title] isEqualToString:#"Current Location"])
{
pinView.pinColor = MKPinAnnotationColorRed;
}
else
{
pinView.pinColor = MKPinAnnotationColorPurple;
}
Related
i Am using following code
-(MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
{
if ([[annotation title] isEqualToString:#"Current Location"] )
{
MKAnnotationView *anView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:#"currentPin"];
anView.image = [UIImage imageNamed:#"pin_green.png"];
anView.canShowCallout = true;
anView.enabled = true;
return anView;
}
The issue is, it randomly disappears and appears again. Giving a very bad user experience. Any way to fix this?
There are several suspect things about this code:
You're not using dequeue, as someone has pointed out. In particular, the problem here is that you are making a new view every single time, rather than checking to see whether a new view needs making.
You are forgetting the key step, namely, to associate the view with the annotation.
Here is the canonical structure of a simple viewForAnnotation: implementation where we supply our own view:
- (MKAnnotationView *)mapView:(MKMapView *)mapView
viewForAnnotation:(id <MKAnnotation>)annotation {
MKAnnotationView* v = nil;
if ([annotation.title isEqualToString:#"Current Location"]) {
static NSString* ident = #"greenPin";
v = [mapView dequeueReusableAnnotationViewWithIdentifier:ident];
if (v == nil) {
v = [[MKAnnotationView alloc] initWithAnnotation:annotation
reuseIdentifier:ident];
v.image = [UIImage imageNamed:#"pin_green.png"];
v.canShowCallout = YES;
}
v.annotation = annotation;
}
return v;
}
Since that code works for me, I'd suggest you start with it and tweak it as necessary.
By the way, you do NOT need this method just to get a green pin! You do know that, right? iOS will give you a green pin (MKPinAnnotationColorGreen).
You should use MKMapView's dequeueReusableAnnotationViewWithIdentifier: and see if you get a view back before creating a new one with initWithAnnotation:reuseIdentifier::
MKAnnotationView *anView = [mapView dequeueReusableAnnotationViewWithIdentifier:#"currentPin"];
if (!anView) {
anView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:#"currentPin"];
anView.image = [UIImage imageNamed:#"pin_green.png"];
anView.canShowCallout = true;
anView.enabled = true;
}
return anView;
That said, I'm not entirely sure this is the cause of your problem.
I observed a strange behavior with the map in iOS 6.
Here is a code which adds a single annotation, absolutely nothing else in the project:
- (void)viewDidLoad
{
[super viewDidLoad];
MKPointAnnotation * p = [[MKPointAnnotation alloc] init];
p.coordinate = CLLocationCoordinate2DMake(10, 10);
p.title = #" test test";
[self.mapView addAnnotation:p];
self.mapView.centerCoordinate = p.coordinate;
}
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id < MKAnnotation >)annotation
{
MKPinAnnotationView * p = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:#"wassup" ];
p.canShowCallout = YES;
p.pinColor = MKPinAnnotationColorGreen;
return p;
}
When it is selected and I move (pan) the map small distances like 0.5-1 cm, on iOS6 the annotation gets deselected. On earlier versions works as expected and remains selected.
Is it a bug ? Is there any workaround for this ?
Thanks !
Apple maps are full of bugs.. LOL you noticed that too..
Its a feature of iOS 6 sometime can irritate the the user.. :)
in annotaionView method use:
// iOS6 BUG WORKAROUND !!!!!!!
if (is6orMore) {
[annotationView setTransform:CGAffineTransformMakeRotation(.001)]; //any small positive rotation
}
Also see the link
If you want to not deselect an annotation view, you should subclass MKAnnotationView and override the setSelected:animated: method and stop the annotation view from being deselected.
In my Application I have to show the google map along with pin images. I have to place two images according to the condition(branch,atm).In viewForAnnotation method I am doing code for the same,in NSLog I am getting the correct output but annotation images aren't placing properly.
Images are placing inconsistently.Here is my code.
- (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>) annotation{
NSString* identifier = #"Pin";
MKAnnotationView* annView = [searchMapView dequeueReusableAnnotationViewWithIdentifier:identifier];
AddressAnnotation *delegate = annotation;
Location *newLoc = [searchData objectAtIndex:countATMandBranch];
if (annView == nil) {
annView = [[[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:#"cell"]autorelease];
annView.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
if(newLoc.isATM == YES)
{
annView.image = [UIImage imageNamed:#"map_atmicon.png"];
}
else if(newLoc.isBranch == YES)
{
annView.image = [UIImage imageNamed:#"map_branchicon.png"];
}
//annView.enabled = YES;
annView.tag = mapView.tag;
annView.canShowCallout =YES;
}
countATMandBranch++;
return annView;
}
If any one aware of this kind of issue please reply to my question.
This might be an offset issue.
When you use a custom image for an MKAnnotationView it will by default position it in the center. If you are using a custom 'pin' image this isn't what you want - you want the bottom of the pin to point to the location, rather than the center. If you don't change the offset, when you zoom in/out the position of the annotation will appear to change in comparison to where you think it should be.
You should therefore make sure you've set an appropriate centerOffset on your annotation view. I don't see you setting it in the code above, so unless you want your image to be centered exactly on the coordinates required this is probably what's causing it.
I'm new to programming and obj-c and currently working on a map based iphone app which will locate different sport facilities. I want each pin to show a different overlay, for instance a picture overlay will do fine, I'll add pics into the resource folder and I want each pin to reveal a different picture by clicking it. My example only includes one pin with its cordinates.
Now, I have now clue where to start, hope u can help me out!
thanks in advance :)
Here's my code:
[mapView addAnnotation:[MapLocation mapLocationtWithTitle:#"Beckomberga Sim och Sporthall" subtitle:#"Söderberga Allé 80" andCoordinate:(CLLocationCoordinate2D){ 59.35817, 17.89740 }]];
}
-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
if([annotation isKindOfClass:[MapLocation class]])
{
MKPinAnnotationView *pin = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:#"PinAnnotation"];
pin.canShowCallout = YES;
pin.animatesDrop = NO;
pin.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
pin.pinColor = MKPinAnnotationColorRed;
pin.pinColor = MKPinAnnotationColorGreen;
[pin autorelease];
return pin;
}
return nil;
}
Viktor,
Here is what you need to do:
Create a subobject of MKAnnotation that will represent your locations, SportsFacilityLocation
That object will contain title, subtitle, and location fields. This is to conform to the MKAnnotation protocol
Next you need an object that will be a subclass of MKAnnotationView, SportsFacilityMapView.
Finally in your viewForAnnotation delegate method you need to check each annotation type
and from that annotation type you will determine to return your SportsFacilityMapView
Check the docs on how to implement the Annotation and then AnnotationView. I have some example code at home that I will post later if you need it. Good Luck!
This is my -mapView:viewForAnnotation method which drops pins when i create annotation views. But when i set mapView.showsUserLocation = YES; in -viewDidLoad, i get a pin dropped on Infinite Loop (expected - in simulator) and not the normal blue dot.
- (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>) annotation{
MKAnnotationView *anno = nil;
//create a pin annotation view
MKPinAnnotationView *pin=[[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:#"pin"]autorelease];
[pin setPinColor:MKPinAnnotationColorRed];
pin.animatesDrop=YES;
pin.canShowCallout = YES;
pin.calloutOffset = CGPointMake(-5, 5);
anno = pin;
return anno;
}
How can i get it to drop pins and show the blue dot as well?
Thanks
Really simple to fix, although unsure if this is the correct way to do it...
if (annotation == mapView.userLocation){
return nil; //default to blue dot
}
Similar to the other answer, here's something close:
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
NSString *annotationType = [NSString stringWithCString:object_getClassName(annotation)];
if ([annotationType compare:#"NSKVONotifying_MKUserLocation"] == 0)
return nil;
...
}
Of course, use something like this at your own risk. It could stop working tomorrow if Apple decided to change that name.
Often you use your own class of annotation to look up information related to the annotation. In that case, to only handle your own annotations, use something like
if ([annotation isKindOfClass:[MapLocation class]]) {}