如何修复 SWIFT 中的"无效区域<中心：-180.00000000、-180.00000000 span：nan、nan>"错误

Question

我想获得该区域，以便我可以安装在其中的注释。但是我被徒劳的例外" nsinvalidargumentException"，原因："无效地区"。那么我如何解决这个问题？

var topLeftCoordinate = CLLocationCoordinate2D(latitude: -90, longitude: 180)
var bottomRightCoordinate = CLLocationCoordinate2D(latitude: 90, longitude: -180)
for annotation in mapView.annotations where !annotation.isKind(of: DriverAnnotation.self){
            topLeftCoordinate.longitude = fmin(topLeftCoordinate.longitude, annotation.coordinate.longitude)
            topLeftCoordinate.latitude = fmax(topLeftCoordinate.latitude, annotation.coordinate.latitude)
            bottomRightCoordinate.longitude = fmin(bottomRightCoordinate.longitude, annotation.coordinate.longitude)
            bottomRightCoordinate.latitude = fmax(bottomRightCoordinate.latitude, annotation.coordinate.latitude)
        }

var region = mkcoordinateregion(中心： cllocationCoortion2dmake(topleftCoorcory.Latitude- (topleftCoorcorion.latitude -dottomrightcoorceartion.latitude( * 0.5， topleftCoorcorion.longitude (bottomRightCoorceartion.longitude- topleftCoorcorion.longitude( * 0.5(，跨度： mkcoordinatespan(latitudedelta：fabs(topleflftCoorication.Latitude-( bottomRightCoorceartion.Latitude( * 2.0，纵向甲列为： Fabs(底部右坐标。 2.0((

region = mapView.RegionThatFits(region(mapview.setRegion(region， 动画：true(

Answer 1

这是计算符合所有注释范围的矩形的错误方法。

使用此功能，将注释映射到其坐标，然后映射到MKMapRect实例。reduce/union功能计算RECT

的大小

let coordinates = mapView.annotations.lazy.filter{!($0 is DriverAnnotation)}.map{ $0.coordinate }
let rects = coordinates.map { MKMapRect(origin: MKMapPoint($0), size: MKMapSize()) }
let mapRect = rects.reduce(MKMapRect.null) { $0.union($1) }
mapView.setVisibleMapRect(mapRect, animated: true)

或更简单(感谢苏尔坦(

let annotations = mapView.annotations.filter{!($0 is DriverAnnotation)}
mapView.showAnnotations(annotations, animated: true)