应该如何设置下面的数组.我试图在我的地图上添加多个注释.我能够在stackoverflow上找到下面的代码,但是他们没有展示如何设置数组.
var objects = [
//how should the array be setup here
]
for objecters in objects!{
if let latit = objecters["Coordinates"]["Latitude"]{
self.latitudepoint = latit as! String
self.map.reloadInputViews()
}
else {
continue
}
if let longi = objecters["Coordinates"]["Longitude"]{
self.longitudepoint = longi as! String
self.map.reloadInputViews()
}
else {
continue
}
var annotation = MKPointAnnotation()
var coord = CLLocationCoordinate2D(latitude: Double(self.latitudepoint)!,longitude: Double(self.longitudepoint)!)
mapView.addAnnotation(annotation)
}
解决方法
你可以做,例如：
let locations = [
["title": "New York,NY","latitude": 40.713054,"longitude": -74.007228],["title": "Los Angeles,CA","latitude": 34.052238,"longitude": -118.243344],["title": "Chicago,IL","latitude": 41.883229,"longitude": -87.632398]
]
for location in locations {
let annotation = MKPointAnnotation()
annotation.title = location["title"] as? String
annotation.coordinate = CLLocationCoordinate2D(latitude: location["latitude"] as! Double,longitude: location["longitude"] as! Double)
mapView.addAnnotation(annotation)
}
或者,或者,使用自定义类型,例如：
struct Location {
let title: String
let latitude: Double
let longitude: Double
}
let locations = [
Location(title: "New York,latitude: 40.713054,longitude: -74.007228),Location(title: "Los Angeles,latitude: 34.052238,longitude: -118.243344),Location(title: "Chicago,latitude: 41.883229,longitude: -87.632398)
]
for location in locations {
let annotation = MKPointAnnotation()
annotation.title = location.title
annotation.coordinate = CLLocationCoordinate2D(latitude: location.latitude,longitude: location.longitude)
mapView.addAnnotation(annotation)
}
或者您可以使用map替换for循环：
let annotations = locations.map { location -> MKAnnotation in
let annotation = MKPointAnnotation()
annotation.title = location.title
annotation.coordinate = CLLocationCoordinate2D(latitude: location.latitude,longitude: location.longitude)
return annotation
}
mapView.addAnnotations(annotations)
