really strange problem here.
I add 4 annotations (or 15, or 20, I've tried a lot of times) and I only get 2 or max 3 of them showing on the map (random ones).
here is the source:
// [self showRealEstates];
CLLocationCoordinate2D theCoordinate1;
theCoordinate1.latitude = 37.786996;
theCoordinate1.longitude = -122.419281;
CLLocationCoordinate2D theCoordinate2;
theCoordinate2.latitude = 37.810000;
theCoordinate2.longitude = -122.477989;
CLLocationCoordinate2D theCoordinate3;
theCoordinate3.latitude = 37.760000;
theCoordinate3.longitude = -122.447989;
CLLocationCoordinate2D theCoordinate4;
theCoordinate4.latitude = 37.80000;
theCoordinate4.longitude = -122.407989;
MapAnnotationRealEstate* myAnnotation1=[[MapAnnotationRealEstate alloc] initWithCoordinate:theCoordinate1 andTitle:#"Rohan"];
MapAnnotationRealEstate* myAnnotation2=[[MapAnnotationRealEstate alloc] initWithCoordinate:theCoordinate2 andTitle:#"Vaibhav"];
MapAnnotationRealEstate* myAnnotation3=[[MapAnnotationRealEstate alloc] initWithCoordinate:theCoordinate3 andTitle:#"Rituraj"];
MapAnnotationRealEstate* myAnnotation4=[[MapAnnotationRealEstate alloc] initWithCoordinate:theCoordinate4 andTitle:#"Sahil"];
NSMutableArray * annotations = [[NSMutableArray alloc] init];
[annotations addObject:myAnnotation1];
[annotations addObject:myAnnotation2];
[annotations addObject:myAnnotation3];
[annotations addObject:myAnnotation4];
[mapView addAnnotations:annotations];
// [mapView addAnnotation:myAnnotation1];
// [mapView addAnnotation:myAnnotation2];
// [mapView addAnnotation:myAnnotation3];
// [mapView addAnnotation:myAnnotation4];
NSLog(#"annotations: %d", [mapView annotations].count);
The log at the end shows 2, or 3. Don't know what to do, simplified the example as much as I could to eliminate other factors, still getting this.
As We can see the lat/long of these two are pretty close. I believe all the annotations are plotted on map and you are just not able to see from the current zoomlevel.
CLLocationCoordinate2D theCoordinate1;
theCoordinate1.latitude = 37.786996;
theCoordinate1.longitude = -122.419281;
CLLocationCoordinate2D theCoordinate4;
theCoordinate4.latitude = 37.80000;
theCoordinate4.longitude = -122.407989;
They seems to be overlapped in mapview in zoomed out view.
Try zoom-in your map to max level & I believe you will see all 4 annotations.
or you can try by changing the lat/long of one of these annotations.
Related
I am working on MapView,on which I have two buttons.
1)centreButton:
this button drops the pin annotation at the centre of the current map.
when this button is pressed, I am storing the last annotation in a NSMutable array.
then remove the last annotation from mapview and drop one pin at the centre of map
Code I have done for this part is as follows:
function for dropping the pin
- (void)PinDropwithlatitude:(double)lat longitude:(double)longi droptitle:(NSString *)title
{
CLLocationCoordinate2D theCoordinate;
theCoordinate.latitude = lat;
theCoordinate.longitude = longi;
MKCoordinateRegion region;
region.center.latitude = theCoordinate.latitude;
region.center.longitude = theCoordinate.longitude;
//Set Zoom level using Span
MKCoordinateSpan span;
span.latitudeDelta =0.005;
span.longitudeDelta =0.005;
region.span = span;
[MapView setRegion:region animated:YES];
SetLat =lat;
SetLong =longi;
DDAnnotation *annotation = [[[DDAnnotation alloc] initWithCoordinate:theCoordinate addressDictionary:nil] autorelease];
annotation.title = title;
annotation.subtitle = [NSString stringWithFormat:#"%f %f", annotation.coordinate.latitude, annotation.coordinate.longitude];
[MapView addAnnotation:annotation];
}
when I press centre button I am doing the following code and store last array in annotation.
-(IBAction)CenterPressed:(id)sender
{
//40.439631,-3.698273 -spain centre
[lastAnnotation addObjectsFromArray:MapView.annotations];
NSLog(#"last annotation array=%#",lastAnnotation);
for (id annotation in [MapView annotations])
{
if ([annotation isKindOfClass:[MKUserLocation class]])
{
continue;
}
[MapView removeAnnotation:annotation];
}
[self PinDropwithlatitude:SetLat longitude:SetLong
droptitle:NSLocalizedString(#"Title", nil)];
}
the log for the array is showing me the
last annotations you can see below::
last annotation array=(
"<+40.43963100,-3.69827300> +/- 0.00m",
"<+40.43923187,-3.68722200> +/- 0.00m",
"<+40.43792343,-3.67670774> +/- 0.00m",
"<+40.43772888,-3.66711617> +/- 0.00m"
)
2)UNDOButton: which removes the currently placed annotation and redrop the previous annotation, for that i have removed the annotaion from mapview, and redrop the annotation last annotation from array which i have maintained previously,using the code:
-(IBAction)undoPressed:(id)sender
{
if ([lastAnnotation count]>0)
{
int countAnn = [lastAnnotation count];
[MapView removeAnnotation:[lastAnnotation objectAtIndex:countAnn-1]];
//[MapView delete:[lastAnnotation objectAtIndex:countAnn-1]];
[lastAnnotation removeObjectAtIndex:countAnn-1];
double latitude = [[[lastAnnotation objectAtIndex:[lastAnnotation count]-1] annotation]coordinate].latitude;
double longitude = [[[lastAnnotation objectAtIndex:[lastAnnotation count]-1]annotation]coordinate].longitude;
NSLog(#"count = %d",[lastAnnotation count]);
[self PinDropwithlatitude:latitude longitude:longitude droptitle:NSLocalizedString(#"Title", nil)];
}
}
but when i press the undo button it crashes with the following error
-[DDAnnotation annotation]: unrecognized selector sent to instance 0x79b8f40
I don't get to know, where exactly the problem arises. can any one please help me to point out my mistake in the above code.
thanks
can you try
[lastAnnotation lastObject]
instead of
[[lastAnnotation objectAtIndex:[lastAnnotation count]-1]
like
[MapView removeAnnotation:[lastAnnotation lastObject]];
[lastAnnotation removeObject:[lastAnnotation lastObject]];
I have loaded the custom annotation image for user current location.I am updating the current user location after every 1 sec in background.
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
[self performSelectorOnMainThread:#selector(tempupdate) withObject:nil waitUntilDone:NO];
[pool release];
-(void)tempupdate
{
NSLog(#"callToLocationManager");
mylocationManager = [[CLLocationManager alloc]init];
NSLog(#"locationManagerM = %#",mylocationManager);
mylocationManager.delegate = self;
mylocationManager.desiredAccuracy = kCLLocationAccuracyBest;
mylocationManager.distanceFilter = 500;
[mylocationManager startUpdatingLocation];
}
After updating the current latutude and longitude i am refreshing the map using following code
MKCoordinateRegion region;
MKCoordinateSpan span;
span.latitudeDelta=0.002;
span.longitudeDelta=0.002;
CLLocationCoordinate2D location;
location.latitude=[lat doubleValue];
location.longitude=[longt doubleValue];
region.span=span;
region.center=location;
addAnnotation=[[AddressAnnotation alloc]initWithCoordinate:location];
addAnnotation.mTitle=#"You are here";
[self.mapView removeAnnotations:self.mapView.annotations];
[self.mapView addAnnotation:addAnnotation];
[self.mapView setRegion:region animated:TRUE];
[self.mapView regionThatFits:region];
But every time custom annotation image blinks before adding to the map.How to avoid this flicker effect?
I haven't tested this yet, but based on a quick glance at your code, I would guess the issue lies in your removal of the annotation and then adding a new one.
Have you tried just editing the already attached annotation's properties?
NSArray* curAnnotations = [mapView annotations];
AddressAnnotation* aa = [curAnnotations lastObject]; // I am assuming you only have 1 annotation
aa.mTitle = #"You are here"; // or don't do this if it never changes
[aa setCoordinate:location];
Note: Apple Docs specifically call out the 'setCoordinate' method as something that should be used to support dragging or frequent updates.
you mustn't remove annotation from map. Instead change the annotation coordinate in the UIView beginAnimations-commitAnimations block;
It will look something like this:
[UIView beginAnimations:#"yourAnimationName" context:nil];
[UIView setAnimationDuration:1.0];
[yourAnnotation setCoordinate:yourNewCoordinate];
[UIView commitAnimations];
It will move smoothly the annotation.
BR,
Marcin Szulc
//SWIFT 3
UIView.beginAnimations("yourname", context: nil)
UIView.setAnimationDuration(1.0)
yourpin.coordinate = MKCoordinateForMapPoint(mycoordinate)
UIView.commitAnimations()
When I load 500 annotations on map, app becomes laggy when moving a map, is there a way to solve this problem?
It's good when the map is zoomed and show 50 annotations, but when zoomed out to show all annotations, app is slow and it laggs when moving within a map.
Current code:
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.annotations = [[NSMutableArray alloc] init];
// Create location manager object
locationManager = [[CLLocationManager alloc] init];
// All results from the location manager
[locationManager setDistanceFilter:kCLDistanceFilterNone];
// Set accuracy
[locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
// Start updating current location
[mapView setShowsUserLocation:YES];
self.mapView.mapType = MKMapTypeStandard; // also MKMapTypeSatellite or MKMapTypeHybrid
// Start off by default in some city
MKCoordinateRegion newRegion;
newRegion.center.latitude = value1;
newRegion.center.longitude = value2;
newRegion.span.latitudeDelta = value3;
newRegion.span.longitudeDelta = value4;
[self.mapView setRegion:newRegion animated:YES];
[self.mapView addAnnotations:self.annotations]; // --> self.annotations is array with 500 annotations
}
The below code is what I have used so far, and it loops through every object in the array correctly, but when I try to make them all display on one map it only adds the last obeject in the array to the map, not all 20 or so I want to display.
self.clientTable = [ClientDatabase database].clientTable;
ClientTable *info = nil;
[_nameLabel setText:info.name];
[_stateLabel setText:info.state];
//change the string to doubles for the map GPS co-ordinates
double latDouble = [info.latMap doubleValue];
double longDouble = [info.longMap doubleValue];
NSLog(#"%d",[self.clientTable count]);
int countArray = [self.clientTable count];
for (int i=0;i<countArray;i++) {
info = [self.clientTable objectAtIndex:i];
info.uniqueId=i;
NSLog(#" i = %d ; id = %d %#",i, info.uniqueId, info.name);
//set up the map
[super viewDidLoad];
[mapView setMapType:MKMapTypeStandard];
[mapView setZoomEnabled:YES];
[mapView setScrollEnabled:YES];
MKCoordinateRegion region = {{0.0,0.0},{0.0,0.0}};
region.center.latitude = latDouble;
region.center.longitude = longDouble;
region.span.longitudeDelta =0.02; //degrees of acuracy, most precise best for this time
region.span.latitudeDelta =0.02; //degrees of accuracy
[mapView setRegion:region animated:YES];
// set up the annotation point
AllMap *annotationPoint = [[AllMap alloc] init];
annotationPoint.title = info.name;
annotationPoint.subtitle = info.state;
annotationPoint.coordinate = region.center;
[mapView addAnnotation:annotationPoint];
annotationPoint.isAccessibilityElement=YES;
//show annotation by default
[mapView selectAnnotation:annotationPoint animated:YES];
[mapView setDelegate:self];
}
Sorry if the code is rubbishy, i'm new to iPhone programming.
Thanks in advance :D
It looks like you're calling [super viewDidLoad] inside your for loop, which is probably resetting the mapView's annotations array. This method should only be called once, so if you move it before the for statement you may get better results.
why are you setting up the map inside of the loop where you are creating the annotations?
here is an old blog posting, but it covers the basics and should get you back on track
I use a MapView and I set annotations on it (purple pins) and my user location (which is a blue circle).
Because the purple pin annotations will move, I have to remove and set them new to the map.
I set it with:
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};
MyMapAnnotation* annotation = [[MyMapAnnotation alloc] initWithCoordinate:newCoord andID:count++];
[mapView addAnnotation:annotation];
[annotation release];
}
Before that, I do a
[mapView removeAnnotations:mapView.annotations];
but this line also remove my location with the blue point!
How could I do this without removing my location.
Thanks a lot in advance & Best Regards.
A very easy way to do this is to include this line before the loop where you remove the annotations:
self.mapView.showsUserLocation = NO;
and then after the loop, put the user location back in
self.mapView.showsUserLocation = YES;
EDIT: I just saw that you didn't loop through the locations to remove them. I'm not sure if this will work with the way you do it.