使用Google的方法如MapKit的struct MKCoordinateRegion

Question

我为Google为本教程重新设计了iOS。我想通过提供一个中心点和一个定义水平和垂直范围的跨度来定义它。我读过本教程介绍用于iOS的Google，我认为应该使用zoomAtCoordinate:forMeters:perPoints: --在我的观点中，这是不完全正确的

    func mapRegion() -> MKCoordinateRegion {
        var region: MKCoordinateRegion = MKCoordinateRegion(center: CLLocationCoordinate2DMake(0, 0), span: MKCoordinateSpanMake(0, 0))
        var initialLoc: Location = self.trek.locations.firstObject as! Location
var minLat = (initialLoc as Location).latitude.doubleValue
        var minLng = (initialLoc as Location).longitude.doubleValue
        var maxLat = (initialLoc as Location).latitude.doubleValue
        var maxLng = (initialLoc as Location).longitude.doubleValue

        for location in self.trek.locations.array {
            if (location as! Location).latitude.doubleValue < minLat {
                minLat = (location as! Location).latitude.doubleValue;
            }
            if (location as! Location).longitude.doubleValue < minLng {
                minLng = (location as! Location).longitude.doubleValue;
            }
            if (location as! Location).latitude.doubleValue > maxLat {
                maxLat = (location as! Location).latitude.doubleValue;
            }
            if (location as! Location).longitude.doubleValue > maxLng {
                maxLng = (location as! Location).longitude.doubleValue;
            }
        }

        region.center.latitude = (minLat + maxLat) / 2.0;
        region.center.longitude = (minLng + maxLng) / 2.0;

        region.span.latitudeDelta = (maxLat - minLat) * 1.1; // 10% padding
        region.span.longitudeDelta = (maxLng - minLng) * 1.1; // 10% padding

        return region;

    }

Answer 1

您必须使用GMSCoordinateBounds

func mapRegion() -> GMSCoordinateBounds {
        var path = GMSMutablePath()
        var bounds = GMSCoordinateBounds(path: path)
        var initialLoc: Location = self.trek.locations.firstObject as! Location    
        var minLat = (initialLoc as Location).latitude.doubleValue
        var minLng = (initialLoc as Location).longitude.doubleValue
        var maxLat = (initialLoc as Location).latitude.doubleValue
        var maxLng = (initialLoc as Location).longitude.doubleValue      
        for location in self.trek.locations.array {
            if (location as! Location).latitude.doubleValue < minLat {
                minLat = (location as! Location).latitude.doubleValue;
            }
            if (location as! Location).longitude.doubleValue < minLng {
                minLng = (location as! Location).longitude.doubleValue;
            }
            if (location as! Location).latitude.doubleValue > maxLat {
                maxLat = (location as! Location).latitude.doubleValue;
            }
            if (location as! Location).longitude.doubleValue > maxLng {
                maxLng = (location as! Location).longitude.doubleValue;
            }
        }       
        path.addCoordinate(CLLocationCoordinate2DMake(minLat, minLng))
        path.addCoordinate(CLLocationCoordinate2DMake(maxLat, maxLng)) 
        return bounds;
    }   
self.viewMap?.animateWithCameraUpdate(GMSCameraUpdate.fitBounds(mapRegion(), withPadding: 15.0))