[英]Swift 2 MapKit Annotations - How to group annotations?
我已经知道了
var zoomLevel = Double()
var iphoneScaleFactorLatitude = Double()
var iphoneScaleFactorLongitude = Double()
var CanUpdateMap: Bool = false
static func getLatitudeLongitudeLimitsFromMap(mapView: MKMapView) -> [String: Double] {
var coord = [String: Double]()
let MinLat: Double = mapView.region.center.latitude - (mapView.region.span.latitudeDelta / 2)
let MaxLat: Double = mapView.region.center.latitude + (mapView.region.span.latitudeDelta / 2)
let MinLon: Double = mapView.region.center.longitude - (mapView.region.span.longitudeDelta / 2)
let MaxLon: Double = mapView.region.center.longitude + (mapView.region.span.longitudeDelta / 2)
coord["MinLat"] = MinLat
coord["MaxLat"] = MaxLat
coord["MinLon"] = MinLon
coord["MaxLon"] = MaxLon
return coord
}
func LoadMap(mapView: MKMapView) {
// Get the limits after move or resize the map
let coord: [String: Double] = getLatitudeLongitudeLimitsFromMap(mapView)
let MinLat: Double = coord["MinLat"]! as Double
let MaxLat: Double = coord["MaxLat"]! as Double
let MinLon: Double = coord["MinLon"]! as Double
let MaxLon: Double = coord["MaxLon"]! as Double
var arrAnnotations = [MKAnnotation]()
let FilterMinLat = arrDicListPinsWithLatitudeLongitude.filter({
if let item = $0["Latitude"] as? Double {
return item > MinLat
} else {
return false
}
})
let FilterMaxLat = FilterMinLat.filter({
if let item = $0["Latitude"] as? Double {
return item < MaxLat
} else {
return false
}
})
let FilterMinLon = FilterMaxLat.filter({
if let item = $0["Longitude"] as? Double {
return item > MinLon
} else {
return false
}
})
let FilterMaxLon = FilterMinLon.filter({
if let item = $0["Longitude"] as? Double {
return item < MaxLon
} else {
return false
}
})
for Item in FilterMaxLon {
let dic:[String:AnyObject] = Item
var Name = String()
var Address = String()
var IconPNG = String()
if let Latitude = dic["Latitude"] as? Double {
if let Longitude = dic["Longitude"] as? Double {
if let item = dic["Name"] {
Name = item as! String
}
if let item = dic["Address"] {
Address = item as! String
}
if let item = dic["TypeID"] as? Int {
if item == 11 {
IconPNG = "icon-cross.png"
} else {
IconPNG = "icon-heart.png"
}
}
arrAnnotations.append(CreateAnnotation(Address, Title: Name, Latitude: Latitude, Longitude: Longitude, IconPNG: IconPNG))
}
}
}
}
// Show in the map only the annotations from that specific region
iphoneScaleFactorLatitude = mapView.region.center.latitude
iphoneScaleFactorLongitude = mapView.region.center.longitude
if zoomLevel != mapView.region.span.longitudeDelta {
filterAnnotations(arrAnnotations)
zoomLevel = mapView.region.span.longitudeDelta
CanUpdateMap = true
}
}
func filterAnnotations(arrAnnotations: [MKAnnotation]) {
let latDelta: Double = 0.04 / iphoneScaleFactorLatitude
let lonDelta: Double = 0.04 / iphoneScaleFactorLongitude
var shopsToShow = [AnyObject]()
var arrAnnotationsNew = [MKAnnotation]()
for var i = 0; i < arrAnnotations.count; i++ {
let checkingLocation: MKAnnotation = arrAnnotations[i]
let latitude: Double = checkingLocation.coordinate.latitude
let longitude: Double = checkingLocation.coordinate.longitude
var found: Bool = false
for tempPlacemark: MKAnnotation in shopsToShow as! [MKAnnotation] {
if fabs(tempPlacemark.coordinate.latitude - latitude) < fabs(latDelta) && fabs(tempPlacemark.coordinate.longitude - longitude) < fabs(lonDelta) {
found = true
}
}
if !found {
shopsToShow.append(checkingLocation)
arrAnnotationsNew.append(checkingLocation)
}
}
// Clean the map
for item: MKAnnotation in self.mapRedes.annotations {
myMap.removeAnnotation(item)
}
// Add new annotations to the map
for item: MKAnnotation in arrAnnotationsNew {
myMap.addAnnotation(item)
}
}
func mapView(mapView: MKMapView, regionDidChangeAnimated animated: Bool) {
// This validation should be added, because it will find all the annotations before the map resize
if CanUpdateMap == true {
LoadMap(mapView)
}
}
只是我的代码的更正:
//....
func LoadMap(mapView: MKMapView) {
//....
// Show in the map only the annotations from that specific region
iphoneScaleFactorLatitude = Double(mapView.bounds.size.width / 30) // 30 = width of the annotation
iphoneScaleFactorLongitude = Double(mapView.bounds.size.height / 30) // 30 = height of the annotation
//....
}
func filterAnnotations(mapView: MKMapView, arrAnnotations: [MKAnnotation]) {
let latDelta: Double = mapView.region.span.longitudeDelta / iphoneScaleFactorLatitude
let lonDelta: Double = mapView.region.span.longitudeDelta / iphoneScaleFactorLongitude
//....
}
//....
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