ViewRanger has a custom map which can be zoomed and scrolled on the Apple Watch. I didn't find any way to add extra layers to WKMapView. The emphasis is on "custom", so I want to have a topological map with my own tile /vector source. How can I create something similar?
You have to track gestures separately and call setRegion(_ coordinateRegion: MKCoordinateRegion) method on your WKInterfaceMap object to scroll/zoom map.
Related
How can I lazyload map tiles when using Leaflet?
Especially on mobile devices I don't want to load maptiles at the beginning because most of my users never scroll down to the map.
Well, a very simple trick would be to create your map, or at least to add your Tile Layer, only when your map container comes into viewport.
That way, the tiles will not be requested before the map is actually viewable.
As to how to know when this situation happens, you should find plenty resources online and here. Basically you compare the document scroll and the map container position, and listen to scroll event. A more recent solution uses Intersection Observer.
L.tileLayer(this.settings.tiles + '/{z}/{x}/{y}.jpg', {...})
.on('tileloadstart', function(event) {
event.tile.setAttribute('loading', 'lazy');
});
I am interested in adding an option to my GIS Map application, the ability to draw Polygon, circle, polyroutes overlays for the user to search data within.The problem is that I've read and tested codes of how to draw an overlay, but they are always static.I want it to be dynamic, with dynamic center and points (or radius) set by the user on click.A mystery for me.(I'm a beginner in iPhone programming, this is my first app.)And I'm not using and don't want to use things like ArcGIS API for iPhone.I would appreciate any help.
To let the user "draw" an arbitrary polygon on the map, one approach is to use draggable annotations that represent the corners of the polygon. Provide an "Add Corner" button and some kind of Remove Corner button on each annotation.
See my answer to User creating a box on MKMapView for some more details. On that question though, the OP actually ended up using another solution described in the comments which would work well if the polygons are always rectangles.
For implementing a button in an annotation view (if you want a "Remove Corner" button on the annotations), see my answer to How to get click event from a button added over MKAnnotationView.
Once you a have a polygon or other overlay on the map, dragging it by direct touches may only be possible by adding a gesture recognizer to the map (with its own scrolling turned off) and using a custom MKOverlay and MKOverlayView that allow coordinate changes. Adding a gesture recognizer directly to an MKOverlayView doesn't seem to work and the built-in overlay classes don't allow changes to coordinates.
An alternative to moving by direct touches is putting some controls on the side (Up/Down/Left/Right/etc buttons) that modify the custom overlay.
The Apple sample app Breadcrumb gives an example of a custom overlay/view for a path. In WWDC 2010, the sample app LocationReminders gives an example of a custom overlay/view for a circle that can move and resize.
Finally, when you do a search for businesses, you could use the overlay's boundingMapRect (which is always a rectangle regardless of the overlay's shape) as the bounding box for the initial search and then check if the coordinate of each business found is in the overlay's actual shape using the answer to How to determine if an annotation is inside of MKPolygonView (iOS).
I am trying to create an app where the user can mark an area on a map. I want him to be able to move the area he marked.
I found that there is an api for adding overlays on a map, but I cannot get to move those overlays once I put them on the map. I tried to subclass the MKCircleView with my own view and implement the touchesBegan:withEvent: method but it never seems to get called.
Any ideas how this can be implemented and why it doesn't work this way?
Thanks.
Try looking through the apple developer code for sample called Regions.
It has circles which can be dragged and moved around.
I have an image plan of stores of exhibitors hall. So I need to add annotation to each store in the plan, which is a jpg file.
iPhone MapKit looks like supports only world map. Are there any way I can add my own picture and add annotation to it like google map annotation.
Thanks
I don't think you can do that.
What you can do is using a UIScrollView to scroll and zoom in/out your jpg plan and use subviews to simulate annotations. That's what I would do.
MapKit does not support custom tiles, so your only option is to implement your own map using UIScrollView (and potentially CATiledLayer if the map is large / has many zoom levels).
I want to draw a tile-based overlay on top of a MKMapView, but there's no obvious way to do this.
This appears to be tricky since you can zoom to any level with MKMapView (unlike Google Maps).
Has anyone attempted to do this?
Incase this question is still getting views readers should check out the HazardMap and TileMap demo code from WWDC2010.
I'm working on a game where I need to overlay objects on the map and have them scroll and zoom with the map.
Using annotation views I've been able to solve the first problem and partially solve the second problem. Annotations automatically move with the map. For scaling them, I use the mapView:regionDidChangeAnimated: delegate method to resize my annotations after a zoom event. The problem is that the annotations don't rescale until after the zoom gesture is complete.
I can think of two approaches other than filing a bug with Apple requesting that they provide an API for map overlays:
Put a (mostly invisible) view over the top of the MKMapView that intercepts zoom and scroll events, handles them, and passes them on to the map view.
Customize the open-source RouteMe library with tiles from Open Street Map or CloudMade (the former is slow, the latter costs money). But it's fully open source so you should be able to do overlays to your heart's content. You could also run your own tile server that does the tile overlays on the server.
Something I discovered later:
http://www.gisnotes.com/wordpress/2009/10/iphone-devnote-14-drawing-a-point-line-polygon-on-top-of-mkmapview/
Not quite a tile-based solution, but interesting nonetheless.