目前我们正在使用wms服务而不是苹果地图。我们重写LoadTileAtPath
以从服务器返回切片。
我们的问题是,由于应用程序在偏远地区占用大量时间,我们计划将缩放级别限制在以下级别
水平
1:1,250
1:25,000
1:250,000
在关于zoom levels的文档的帮助下,我将z值限制为19或15或11
这里的方法
nuint ClampedZ(nuint z)
{
//19,15,11
List<nuint> supportedLayers = new List<nuint>(){ 11, 15, 19 };
nuint toRet = z;
nuint min = supportedLayers[0]; //supportedLayers[];
nuint Prevmin = min;
nuint max = supportedLayers[supportedLayers.Count - 1]; //supportedLayers[supportedLayers.Length - 1];
if (z > min && z < max)
{
foreach (nuint ZoomSupported in supportedLayers)
{
if (z < ZoomSupported)
{
toRet = Prevmin;
break;
}
else
{
Prevmin = ZoomSupported;
}
}
}
return toRet;
}
我只是想知道这是否是限制缩放级别的正确方法
答案 0 :(得分:0)
在MKMapViewDelegate
:
func mapView(_ mapView: MKMapView, regionDidChangeAnimated animated: Bool) {
let maxLatitudeDelta: CLLocationDegrees = 1.0 //put in appropriate value for your zoom levels
let maxLongitudeDelta: CLLocationDegrees = 1.0 //put in appropriate value for your zoom levels
let center = mapView.centerCoordinate
let region = MKCoordinateRegionMake(center, MKCoordinateSpan(latitudeDelta: maxLatitudeDelta, longitudeDelta: maxLongitudeDelta))
let adjustedRegion = mapView.regionThatFits(region)
mapView.setRegion(adjustedRegion, animated: true)
}