我正在尝试创建一个地图视图,一旦选择了collectionView单元格,它将在地图上显示该类别的注释。
这是我的代码。
import UIKit
import MapKit
//Creating an outline for the different locations of places on the map
struct PlacesOnMap {
var name: String
var latitude: Double
var longitude: Double
init(name: String, latitude: Double, longitude: Double) {
self.name = name
self.latitude = latitude
self.longitude = longitude
}
}
class ContentViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource {
//Properties of collectionView, that determine number of items in the section and allows a single cell to be reused over and over again
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return imageArray.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CustomCell", for: indexPath) as! CustomCell
cell.mapIconImage.image = imageArray[indexPath.row]
cell.mapIconLabel.text! = imageNameArray[indexPath.row]
return cell
}
//creating a constant for variables within the collection view such as the image and the title of the image
let imageArray = [UIImage(named: "1"), UIImage(named: "2"), UIImage(named: "3")]
let imageNameArray = ["image 1", "image 2", "image 3"]
@IBOutlet var mapView: MKMapView!
var places = [PlacesOnMap(name: "place 1", latitude: 28.551700, longitude: -81.374800),
PlacesOnMap(name: "place 2", latitude: 28.553018, longitude: -81.374206),
PlacesOnMap(name: "place 3", latitude: 28.553019, longitude: -81.367839)
]
var buildings = [PlacesOnMap(name: "place 1", latitude: 28.556969, longitude: -81.364319),
PlacesOnMap(name: "place 2", latitude: 28.558126, longitude: -81.364725)
]
var recreation = [PlacesOnMap(name: "place 1", latitude: 28.54693, longitude: -81.393071),
PlacesOnMap(name: "place 2", latitude: 28.538523, longitude: -81.385399),
PlacesOnMap(name: "place 3", latitude: 28.542817, longitude: -81.378117),
PlacesOnMap(name: "place 4", latitude: 28.538985, longitude: -81.404694)
]
override func viewDidLoad() {
super.viewDidLoad()
mapView?.delegate = self
}
func setPlacesAnnotations() {
let places = places.map { placeOnMap -> MKPointAnnotation in
let place = MKPointAnnotation()
place.coordinate = CLLocationCoordinate2D(latitude: placeOnMap.latitude, longitude: placeOnMap.longitude)
place.title = placeOnMap.name
return place
}
mapView.removeAnnotations(mapView.annotations)
mapView.addAnnotations(places)
}
func setBuildingsAnnotations() {
let places = buildings.map { placeOnMap -> MKPointAnnotation in
let place = MKPointAnnotation()
place.coordinate = CLLocationCoordinate2D(latitude: placeOnMap.latitude, longitude: placeOnMap.longitude)
place.title = placeOnMap.name
return place
}
mapView.removeAnnotations(mapView.annotations)
mapView.addAnnotations(places)
}
func setRecreationAnnotations() {
let places = recreation.map { placeOnMap -> MKPointAnnotation in
let place = MKPointAnnotation()
place.coordinate = CLLocationCoordinate2D(latitude: placeOnMap.latitude, longitude: placeOnMap.longitude)
place.title = placeOnMap.name
return place
}
mapView.removeAnnotations(mapView.annotations)
mapView.addAnnotations(places)
}
//calls the functions up above when a cell from the collection view is selected
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
switch (indexPath.item) {
case 0: setBuildingsAnnotations()
case 1: setPlacesAnnotations()
case 2: setRecreationAnnotations()
default:
break
}
}
}
现在,当我单击collectionView单元时,什么都不会显示,但是在运行打印语句时会传递值。如何解决此问题,以便显示注释?
您需要在一个UICollectionView
中创建一个ViewController
,然后将索引值传递给另一个ViewController
,以在MKMapView
上显示它。
创建示例项目here