Question

我的视图控制器中有一个函数，它有一个mapkit，当位置发生变化时会调用它。我想设置为地图视图，以便以当前位置为中心，并在更新时随之移动。

它在某种意义上起作用，即它跟踪，但它总是缩放。如果我缩小，快照会返回到获取新位置后再次调用更新时的位置。

in from params CLLocation *loc
bool first = TRUE;
if(first){
        first=FALSE; // bit of a bodge...if i set this to false it will track the update possition but not at the desired "zoom" its look far to close.
        CLLocation *loc = [[CLLocation alloc] initWithLatitude:54.976619 longitude:-1.613118];//newcastle city center.
        CLLocationDegrees spanLat = 1000;
        CLLocationDegrees spanLng = 1000;  
        userLocation = MKCoordinateRegionMakeWithDistance(loc.coordinate, spanLat, spanLng);
        [mapview setRegion:userLocation animated:TRUE];
    }else {
        CLLocationDegrees spanLat = [mapview region].span.latitudeDelta;//  keep the originals? DOESN'T WORK!!
        CLLocationDegrees spanLng = [mapview region].span.longitudeDelta;//  
        userLocation = MKCoordinateRegionMakeWithDistance(loc.coordinate, spanLat, spanLng);
        [mapview setRegion:userLocation animated:TRUE];
    }

Answer 1

只需保持设置中心坐标，不要设置区域。

顺便说一下，你确实知道你不需要任何代码，对吧？您可以告诉mapview跟踪设备的当前位置。请参阅我的书中的示例：

http://www.apeth.com/iOSBook/ch34.html#_map_kit_and_current_location

更新位置时，地图视图范围会发生变化

1 个答案: