mkmapview

问题 I am loading Mapview with geojson data. It contains 7000 data in that geojson file. Even I loaded that data into Mapview . Its loaded fine, but, the problem is mapview getting freezing/stucking for few seconds while zoomin/zoomou So, its getting very bad user experience. Even, I loaded the data in background thread, still mapview getting freeze. After I read few forums, we can load clusters to avoid this kind freeze UI issue for mapview, but, I did not found for geojson data loading with

问题 I've had some past experience using MKMapView and MKPointAnnotation , which I used to put some pin on a map. This time I am trying to go one step further and use MKPinAnnotationView , to write a label along with some of the pins. Unfortunately, it doesn't all work as I expect. Here is what I want to do: I have a map (an MKMapView object) and when I touch it, I put a pin at the touch point, then some computation is performed and this gives me a second point on the map. I put a second pin on

问题 I try to subclass from MKOverlayPathRenderer and implement -createPath - (void)createPath { MKPolyline *line = (id)self.overlay; MKMapPoint *points = line.points; NSUInteger pointCount = line.pointCount; CGMutablePathRef path = CGPathCreateMutable(); CGPathMoveToPoint(path, NULL, points[0].x, points[0].y); for (int i = 1; i < pointCount; i++) { CGPathAddLineToPoint(path, NULL, points[i].x, points[i].y); } [self setPath:path]; } I create overlay here: CLLocationCoordinate2D coordinates[events

问题 I have a MKMapView (obviously), that shows housing locations around the user. I have a Radius tool that when a selection is made, the annotations should add/remove based on distance around the user. I have it add/removing fine but for some reason the annotations won't show up until I zoom in or out. This is the method that adds/removes the annotations based on distance. I have tried two different variations of the method. Adds the new annotations to an array, then adds to the map by [mapView

问题 I have an array of annotations.I am calculating the distance between each annotation from user location.What I want to know is, how can I find lets say 3 nearest annotations from these distances? Here is how I am calculating distance from user location to annotations. CLLocation *userLocation = self.mapView.userLocation.location; for (Annotation *obj in annotations) { CLLocation *loc = [[CLLocation alloc] initWithLatitude:obj.coordinate.latitude longitude:obj.coordinate.longitude]; //

问题 I've been trying to use a UILongPressGestureRecognizer in a MKAnnotationView subclass. Interestingly the gesture recognizer only triggers when using two ore fingers/touches. What prevents the gesture recognizer to get triggered with only one touch? Implementation UILongPressGestureRecognizer *pressRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)]; pressRecognizer.minimumPressDuration = 0.25; pressRecognizer.numberOfTapsRequired = 0;

问题 I have an array full of longitudes and latitudes. I have two double variables with my users location. I'd like to test the distance between my user's locations against my array to see which location is the closest. How do I do this? This will get the distance between 2 location but stuggeling to understand how I'd test it against an array of locations. CLLocation *startLocation = [[CLLocation alloc] initWithLatitude:userlatitude longitude:userlongitude]; CLLocation *endLocation = [[CLLocation

问题 I have integrated FBAnnotationClustering on mkmapview which works perfectly, but when there is more than one annotation at exactly the same place I cannot display the annotationView with the correct informations. I'm trying to loop through the annotations and display them in the same view (each with a callout button to display more info). So far I managed to make one callout work to display the details at the bottom, but in the annotationView it displays it without the right title, and there

问题 I am working on the map application and as per requirement i need to show a single pin for a single region even if it has multiple user coordinates when its completely zoomed out but when its zoomed in to the map then i should display all the pins as per its coordinates. I have given example below to explain my problem. I have city New York on this city I have 100 pins on my mapview when I am zooming out of my map it should show me only one annotation pin on the place of 100 pins but when I

问题 I have created a custom MKAnnotation class and it has been working - until iOS 6 came out. Since then my pins get added to the apple map but now without a drop animation! Is this how it is set or there maybe an an issue with the way I'm doing things. I have set a delay of 1 sec until the method that adds the annotations to the map is called, so I can see if the drop animations are actually occurring before the view appears - still, the pins just appear out of nowhere without dropping. Here's