I have been trying to work on a application using the MapKit and MKPolyline.
I have gotten the annotations and paths drawn on the map, however I am trying to change the lineDashPattern to be a set of animated dashes in the direction of the course. I know that the lineDashPhase and lineDashPattern together give you a dashed line, and the more you increase lineDashPhase, the more the dashes move, however is there a way to increase the values in such a way that it appears that it is moving, sort of like ants along a line I guess is a good analogy.
- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id)overlay
{
MKOverlayView* overlayView = nil;
if(overlay == self.routeLine)
{
//if we have not yet created an overlay view for this overlay, create it now.
if(self.routeLineView == nil)
{
self.routeLineView = [[[MKPolylineView alloc] initWithPolyline:self.routeLine] autorelease];
self.routeLineView.lineWidth = 5;
self.routeLineView.lineDashPhase = 15;
NSArray* array = [NSArray arrayWithObjects:[NSNumber numberWithInt:20], [NSNumber numberWithInt:20], nil];
self.routeLineView.lineDashPattern = array;
}
overlayView = self.routeLineView;
}
return overlayView;
}
This right now give me dashed lines. I know there is a similar topic here, however I am not sure how to go about this. Any input would be greatly appreciated!
I know this is a pretty old question, but I have just implemented a similar solution and posted it here.
Related
Hi I have the following problem!
I do add a lot of Overlays to my MKMapView!
For example I add 150 Overlays, but for some reason not all of them show up!
I know that mapView:viewForOverlay: gets called 150 times.
I found out that if I add this: [NSThread sleepForTimeInterval:1] to the method where all my overlays are created all the overlays show up.
so can it be that the overlays being added to fast? or what could be the problem?
all the overlays are created in a background thread like this!
MKPolyline* routeLine;
....
....
dispatch_async(dispatch_get_main_queue(), ^{
[self.myMKMapView addOverlay:routeLine];
});
and this is the mapView:viewForOverlay:
- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
{
MKOverlayView* overlayView = nil;
MKPolylineView * rLV = [[[MKPolylineView alloc] initWithPolyline:overlay]autorelease];
rLV.fillColor = [UIColor blueColor];
rLV.strokeColor = [UIColor blueColor];
rLV.lineWidth = 1;
rLV.alpha = 0.5;
overlayView = rLV;
return overlayView;
}
If you're calling addOverlay: multiple times (and queueing up hundreds of blocks on the main thread), you may get better results calling the addOverlays: method with an array instead.
I'm currently adding annotations to my map through a loop... but the annotations are only appearing on my map in groups. Also, on load, only about 4 annotations are actually displayed on the map... but as I move the map a little, all of the annotations that should be there, suddenly appear.
How can I get all of the annotations to load in the right place, one at a time?
Thanks in advance!
Here is the code I'm using to add annotations:
NSString *incident;
for (incident in weekFeed) {
NSString *finalCoordinates = [[NSString alloc] initWithFormat:#"%#", [incident valueForKey:#"coordinates"]];
NSArray *coordinatesArray = [finalCoordinates componentsSeparatedByString:#","];
latcoord = (#"%#", [coordinatesArray objectAtIndex:0]);
longcoord = (#"%#", [coordinatesArray objectAtIndex:1]);
// Final Logs
NSLog(#"Coordinates in NSString: [%#] - [%#]", latcoord, longcoord);
CLLocationCoordinate2D coord;
coord.latitude = [latcoord doubleValue];
coord.longitude = [longcoord doubleValue];
DisplayMap *ann = [[DisplayMap alloc] init];
ann.title = [NSString stringWithFormat: #"%#", [incident valueForKey:#"incident_type"]];
ann.subtitle = [NSString stringWithFormat: #"%#", [incident valueForKey:#"note"]];
ann.coordinate = coord;
[mapView addAnnotation:ann];
[ann release];
}
// Custom Map Markers
-(MKAnnotationView *)mapView:(MKMapView *)map viewForAnnotation:(id <MKAnnotation>)annotation {
if ([annotation isKindOfClass:[MKUserLocation class]])
return nil; //return nil to use default blue dot view
static NSString *AnnotationViewID = #"annotationViewID";
MKAnnotationView *annotationView = (MKAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:AnnotationViewID];
if (annotationView == nil) {
annotationView = [[[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:AnnotationViewID] autorelease];
}
annotationView.canShowCallout = YES;
if ([annotationView.annotation.title isEqualToString:#"one"]) {
UIImage *pinImage = [UIImage imageNamed:#"marker_1.png"];
[annotationView setImage:pinImage];
}
if ([annotationView.annotation.title isEqualToString:#"two"]) {
UIImage *pinImage = [UIImage imageNamed:#"marker_2.png"];
[annotationView setImage:pinImage];
}
annotationView.annotation = annotation;
return annotationView;
}
- (void) mapView:(MKMapView *)mapV didAddAnnotationViews:(NSArray *)views {
CGRect visibleRect = [mapV annotationVisibleRect];
for (MKAnnotationView *view in views) {
CGRect endFrame = view.frame;
CGRect startFrame = endFrame; startFrame.origin.y = visibleRect.origin.y - startFrame.size.height;
view.frame = startFrame;
[UIView beginAnimations:#"drop" context:NULL];
[UIView setAnimationDuration:0.4];
view.frame = endFrame;
[UIView commitAnimations];
}
}
Adam,
This solution is a bit messy as I had to munge up one of my current projects to test, but hopefully this will work for you.
First an explanation, it's critical to separate data from UI presentation. The [MKMapView addAnnotation(s)] are just a data update to MKMapView and have no direct impact on animation or timing.
The delegate method mapView:didAddAnnotationViews: is where all of the custom presentation behavior should be defined. In your description you didn't want these to appear all at once, so you need to sequence your animations instead of performing them simultaneously.
One method is to add all of the annotations at once and then just add them with increasing animation delays, however new annotations that get added for whatever reason will begin their animations at zero again.
The method below sets up an animation queue self.pendingViewsForAnimation (NSMutableArray) to hold annotation views as they are added and then chains the animation sequentially.
I've replaced the frame animation with alpha to focus on the animation problem to separate it from the issue of some items not appearing. More on this after the code...
// Interface
// ...
// Add property or iVar for pendingViewsForAnimation; you must init/dealloc the array
#property (retain) NSMutableArray* pendingViewsForAnimation;
// Implementation
// ...
- (void)processPendingViewsForAnimation
{
static BOOL runningAnimations = NO;
// Nothing to animate, exit
if ([self.pendingViewsForAnimation count]==0) return;
// Already animating, exit
if (runningAnimations)
return;
// We're animating
runningAnimations = YES;
MKAnnotationView* view = [self.pendingViewsForAnimation lastObject];
[UIView animateWithDuration:0.4 animations:^(void) {
view.alpha = 1;
NSLog(#"Show Annotation[%d] %#",[self.pendingViewsForAnimation count],view);
} completion:^(BOOL finished) {
[self.pendingViewsForAnimation removeObject:view];
runningAnimations = NO;
[self processPendingViewsForAnimation];
}];
}
// This just demonstrates the animation logic, I've removed the "frame" animation for now
// to focus our attention on just the animation.
- (void) mapView:(MKMapView *)mapV didAddAnnotationViews:(NSArray *)views {
for (MKAnnotationView *view in views) {
view.alpha = 0;
[self.pendingViewsForAnimation addObject:view];
}
[self processPendingViewsForAnimation];
}
Regarding your second issue, items are not always appearing until you move the map. I don't see any obvious errors in your code, but here are some things I would do to isolate the problem:
Temporarily remove your mapView:didAddAnnotationViews:, mapView:annotationForView: and any other custom behaviors to see if default behavior works.
Verify that you have a valid Annotation at the addAnnotation: call and that the coordinates are visible (use [mapView visibleMapRect], MKMapRectContainsPoint(), and MKMapPointForCoordinate().
If it is still not functioning, look at where you are calling the add annotations code from. I try to avoid making annotation calls during map movement by using performSelector:withObject:afterDelay. You can precede this with an [NSObject cancelPreviousPerformRequestsWithTarget:selector:object:] to create a slight delay prior to loading annotations in case the map is being moved a long distance with multiple swipes.
One last point, to achieve the pin-drop effect you're looking for, you probably want to offset by a fixed distance from the original object instead of depending on annotationVisibleRect. Your current implementation will result in pins moving at different speeds depending on their distance from the edge. Items at the top will slowly move into place while items at the bottom will fly rapidly into place. Apple's default animation always drops from the same height. An example is here: How can I create a custom "pin-drop" animation using MKAnnotationView?
Hope this helps.
Update:
To demonstrate this code in action I've attached a link to a modified version of Apple's Seismic demo with the following changes:
Changed Earthquake.h/m to be an MKAnnotation object
Added SeismicMapViewController.h/m with above code
Updated RootViewController.h/m to open the map view as a modal page
See: http://dl.dropbox.com/u/36171337/SeismicXMLWithMapDelay.zip
You will need to pause updating after you add each annotation and allow the map to have time to refresh.
- (void) setTheMap
{
myMap.mapType = MKMapTypeStandard;
[myMap setDelegate:self];
CLLocationCoordinate2D coord = {latitude:myValue , longitude:myValue };
MKCoordinateSpan span = {latitudeDelta:0.05f , longitudeDelta: 0.05f};
MKCoordinateRegion region = {coord , span};
[myMap setRegion:region];
[self.view addSubview:myMap];
PantryAnnotation *dis = [[PantryAnnotation alloc] init];
dis.coordinate = region.center;
dis.title = row.panName;
dis.subTitle = row.geo_lat;
[myMap addAnnotation:dis];
}
- (MKAnnotationView *)mapView:(MKMapView *)mV viewForAnnotation:(id<MKAnnotation>)annotation
{ MKPinAnnotationView *pview = nil;
if (annotation != myMap.userLocation)
{
static NSString *defalt = #"Volunteer";
pview = (MKPinAnnotationView *)[myMap dequeueReusableAnnotationViewWithIdentifier:defalt];
if ( pview == nil )
pview = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:defalt] autorelease];
pview.pinColor = MKPinAnnotationColorRed;
pview.canShowCallout = YES;
pview.animatesDrop = YES;
}
else
{
[myMap.userLocation setTitle:#"I am Here"];
}
return pview;
}
The above gives me map view with annotation pin. I have to write this code in more than 8 files. Can any one tell me how can I centralized this code ? I mean to create only one class and by object of that class I can add the map in any other view.
Thanks..
Since the rest of your code is not clear, it is hard to give advice, but you may try to analyze it first;
what is common in these 8 code parts, and what is different?
Then you should figure out if you need to create and hold references to any local variables, lets say your map objects, or something like that.
If so, then subclassing would be the first choice to look at,
if not then an Obj-C category would probably do (http://macdevelopertips.com/objective-c/objective-c-categories.html). P.S: you cannot add member fields with this, only behavior (methods) are allowed.
If you need only objects with little to none behavior other than these, then you may make them plain objects holding the parameters only.
Or even you may use static methods like ( +(void) blahblah; ) just to be short, but dont do it unless you are sure that the behavior is generic in nature...
Well, a soup of advice here, if you provide more info, i can write in one of these directions in more details
good luck!
I'm following this tutorial (http://icodeblog.com/2009/12/21/introduction-to-mapkit-in-iphone-os-3-0/) on adding mapkit and annotations to an application. However, i'm seriously struggling with the User Location. I'm new to xcode so not quite sure what to do next. I have tried Tony's option:
step one: add the CoreLocation framework to the project.
Step two: add this function to the iCodeMapViewController.m:
- (void)setCurrentLocation:(CLLocation *)location {
MKCoordinateRegion region = {{0.0f, 0.0f}, {0.0f, 0.0f}};
region.center = location.coordinate;
region.span.longitudeDelta = 0.15f;
region.span.latitudeDelta = 0.15f;
[self.mapView setRegion:region animated:YES];
}
step three: add this code to the ViewForAnnotation Method:
if (annotation != mapView.userLocation) {
//the rest of the ViewForAnnotation code goes here
}else{
CLLocation *location = [[CLLocation alloc]
initWithLatitude:annotation.coordinate.latitude
longitude:annotation.coordinate.longitude];
[self setCurrentLocation:location];
}
But when i go to build, it doesn't like it.
I've also tried this option:
-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id )annotation
{
if ([annotation isKindOfClass:MKUserLocation.class]) return nil;
//rest of code
}
The blue dot shows, my custom annotations show but the app crashes when i try and scroll through the table. The debugger gives no help but does stop on this statement.
Can someone please help? With code examples too? i think the answer to this post might be useful to a number of people also struggling with the mapkit.
Cheers
I had the same problem, but I managed to solve it.
In cellForRowAtIndexPath I did this:
NSMutableArray *annotations = [[NSMutableArray alloc] init];
if(indexPath.section == 0)
{
for(MinuAsukohad *annotation in [mapView annotations])
{
if(![annotation isKindOfClass:[MKUserLocation class]])
{
if([annotation annotationType] == MinuAsukohadTypeInterest)
{
[annotations addObject:annotation];
}
}
}
cell.textLabel.text = [[annotations objectAtIndex:indexPath.row] title];
}
You just have to repeat it for all the sections.
Sounds like you are trying to include your current location as one of the cells in the table ... look at your console and give us the output when the crash happens.
I use this tutorial for integrating MapKit to my application:
http://iphonebcit.wordpress.com/iphone-map-kit-tutorial/
CLLocationCoordinate2D coordinate;
coordinate.latitude = 49.2802;
coordinate.longitude = -123.1182;
NSUInteger count = 1;
for(int i = 0; i < 10; i++) {
CGFloat latDelta = rand()*.035/RAND_MAX - .02;
CGFloat longDelta = rand()*.03/RAND_MAX - .015;
CLLocationCoordinate2D newCoord = {coordinate.latitude+latDelta, coordinate.longitude+longDelta};
MapDemoAnnotation* annotation = [[MapDemoAnnotation alloc] initWithCoordinate:newCoord andID:count++];
[mapView addAnnotation:annotation];
[annotation release];
}
and
- (MKAnnotationView *)mapView:(MKMapView *)mapViewLocal viewForAnnotation:(id <MKAnnotation>)annotation {
MKPinAnnotationView *pinView = (MKPinAnnotationView*)[mapViewLocal dequeueReusableAnnotationViewWithIdentifier:#"Pin"];
if(pinView == nil) {
pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:#"Pin"];
pinView.pinColor = MKPinAnnotationColorPurple;
pinView.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
pinView.animatesDrop = YES;
pinView.canShowCallout = YES;
} else {
pinView.annotation = annotation;
}
return pinView;
}
So the pins will set on the map randomly. In my application, the coordinates will change. How can I change the coordinates of the annotations, so they will be updated on the map?
Does anyone know?
At iPhone SDK 3.x you have to remove the pin annotations and set it again. That is not very nice if you have many annotations an your map.
I try to make it better so I ony display/renew my pin annotations which are on the screen. So if an user zoom in to New York, there won't be pin annotations in San Francisco or other than the user can't see. So the performance will be much better.
Perhaps in the future this would be possible. I hope so :-)
That tutorial is only for getting a map view to show, nothing else. You're going to need a bigger tutorial. I found this one useful:
http://blog.objectgraph.com/index.php/2009/04/02/iphone-sdk-30-playing-with-map-kit/
Probably what you'll need to do is to loop through all the annotations on the map, removing them, then loop through your data array, adding the annotations back again. You could be more clever about it and loop through the data array, checking if there's already a pin with the same latitude/longitude on the map, but that way gets more complicated.
Since I'm doing annotations at the moment I just made a quick test. You do get a compiler warning, so it might not be supported. But it works.
Make a custom MKAnnotation class so you can set the coordinate property to be writable:
#property (nonatomic, readwrite) CLLocationCoordinate2D coordinate;
Then at whatever event or interval you want, change the coordinate using something like this:
CLLocation *loc=[[CLLocation alloc] initWithLatitude:55.0 longitude:17.0];
annotation.coordinate=loc.coordinate;
[loc release];