CODEWITHSUNDEEP
iosmappinggoogle-maps-api-2mapbox
Elliott D'Alvarez
Elliott D'Alvarez

Reputation: 1237

Mapbox - zoomWithLatitudeLongitudeBoundsSouthWest not zooming to correct location

I am trying to use the following function zoomWithLatitudeLongitudeBoundsSouthWest to zoom to the extent of the uk. I have the following latlongs:

SouthWest = (latitude = 49.724355000000003, longitude = -8.7919210000000003)
NorthEast =  (latitude = 59.556961999999999, longitude = 2.102922)

So use the following:

[rmMapView zoomWithLatitudeLongitudeBoundsSouthWest:self.southWest northEast:self.northEast animated:YES];

When this is passed in to the function it returns the following projected bounds:

origin: (185130.482481, 6398696.510918) size: (48919.698096, 66653.088655)

However, this is not the extent of the UK as expected, it actually zooms in to France. During the process I also set the constraints of the map using the following:

[rmMapView setConstraintsSouthWest:self.southWest northEast:self.northEast];

When I pan around the map and zoom out, the constraints of the map are correct i.e. I can't move outside of the UK. This means that the southWest and northEast are set correctly, however, the zoomWithLatitudeLongitude function is not moving to the correct area. I use this function on smaller areas (subsections of the uk) and it seems to work correctly. Can anyone tell me if they have had similar issues or what I am doing wrong?

Thanks

Upvotes: 1

Views: 720

Answers (2)

Wayne Shelley
Wayne Shelley

Reputation: 1032

For some reason there is a problem with the MapView frame during initialisation. Updating the frame based on another view in the ViewDidLoad seemed to fix the problem.

[self.mapView setFrame:self.view.frame];

Not investigated this fully but seemed to be a good workaround.

Upvotes: 0

user3014190
user3014190

Reputation: 31

Maybe this is little late, but this issue lost me a whole day of work. You are probably testing on 64 bit devices. Try your code on 32 bit devices and it should probably be working fine.

Mapbox had a problem of centering the zoom on 64 bit devices (the zoom level is ok, but the map offset is not).

I worked around this solution by setting the new center of the map after setting the zoom. Try adding this line:

[rmMapView setCenterCoordinate:CLLocationCoordinate2DMake(lat,lng)];
just after zoomWithLatitudeLongitudeBoundsSouthWest
where lat = (latMin + latMax)/2 and lng = (lngMin + lngMax)/2)

NOTE: I was passing animated:NO so this worked in my case. Try somehow animating seCenterCoordinate in your case.

Upvotes: 3

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