我是使用 Swift 3 和 Xcode 8 开发 IOS 应用程序的新手。在我的应用程序中,我使用 regionDidChangeAnimated 委托方法通过 mapView.region.span.latitudeDelta * 111.000 以米为单位保持缩放级别。
当新的位置数据可用时,我使用 MKMapCamera 显示用户位置,其中 fromDistance 参数 = mapView.region.span.latitudeDelta * 111.000 先前计算并保存在实例变量中。
问题是当我捏合和捏合缩放级别无法正常工作
下面贴一点代码:
func mapView(_ mapView: MKMapView, regionDidChangeAnimated animated: Bool) {
mapChangedFromUserInteraction = mapViewRegionDidChangeFromUserInteraction()
if (mapChangedFromUserInteraction) {
self.latitudineDelta = Float(mapView.region.span.latitudeDelta)
}
}
func mapViewRegionDidChangeFromUserInteraction() -> Bool {
let view = self.mapView.subviews[0]
if let gestureRecognizers = view.gestureRecognizers {
for recognizer in gestureRecognizers {
if(recognizer.state == UIGestureRecognizerState.ended)
{
return true
}
}
}
return false
}
fileprivate func centerMapOnLocation()
{
let coordinate = CLLocationCoordinate2D(latitude: self.latitude!,longitude: self.longitude!)
if (mapChangedFromUserInteraction == false)
{
let distance: CLLocationDistance = CLLocationDistance(Int(self.latitudineDelta * 111000))
self.camera = MKMapCamera(lookingAtCenter: coordinate,
fromDistance: distance,
pitch: pitch,
heading: self.heading)
self.mapView.setCamera(self.camera!, animated: isAnimated)
}
}