Swift 将数据从MKAnnotationView传递到UICollectionViewController
我有一个UICollectionViewController,它有一个标题单元格,可以在地图上显示注释。每个注释都是一个具有相关信息的企业,我希望在标题下方的单元格中显示该企业信息的列表(其中显示地图) 现在我可以正确地加载注释并将其添加到标题单元格中。但我希望能够做到的是,根据用户在地图标题中单击的注释,使用适当的数据重新加载collectionview 下面是我的标题单元格的代码,我在其中加载MKMapView并添加必要的方法来添加注释Swift 将数据从MKAnnotationView传递到UICollectionViewController,swift,uicollectionview,mkmapview,mkannotation,Swift,Uicollectionview,Mkmapview,Mkannotation,我有一个UICollectionViewController,它有一个标题单元格,可以在地图上显示注释。每个注释都是一个具有相关信息的企业,我希望在标题下方的单元格中显示该企业信息的列表(其中显示地图) 现在我可以正确地加载注释并将其添加到标题单元格中。但我希望能够做到的是,根据用户在地图标题中单击的注释,使用适当的数据重新加载collectionview 下面是我的标题单元格的代码,我在其中加载MKMapView并添加必要的方法来添加注释 class MapHeaderCell: UIColl
class MapHeaderCell: UICollectionViewCell, MKMapViewDelegate {
let mapView: MKMapView = {
let map = MKMapView()
map.mapType = .standard
map.isZoomEnabled = true
map.isScrollEnabled = true
return map
}()
override init(frame: CGRect) {
super.init(frame: frame)
backgroundColor = .green
addSubview(mapView)
mapView.anchor(top: topAnchor, left: leftAnchor, bottom: bottomAnchor, right: rightAnchor, paddingTop: 0, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: 0, height: 0)
guard let latitude = UserDefaultConstants().latitude, let longitude = UserDefaultConstants().longitude else {
return
}
let coordinate = CLLocationCoordinate2D(latitude: latitude, longitude: longitude)
let region = MKCoordinateRegion(center: coordinate, span: MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01))
mapView.setRegion(region, animated: false)
}
func addAnnotations(businesses: [Business]) {
for business in businesses {
let annotation = MKPointAnnotation()
annotation.title = business.name
annotation.coordinate = CLLocationCoordinate2D(latitude: business.latitude, longitude: business.longitude)
mapView.addAnnotation(annotation)
}
}
//adds annotation to view.
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
guard annotation is MKPointAnnotation else { return nil }
var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: annotationId)
if annotationView == nil {
annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: annotationId)
annotationView!.canShowCallout = true
} else {
annotationView!.annotation = annotation
}
return annotationView
}
}
在另一个类中,我实际加载本地业务的数据,然后填充地图
class MapCollectionVewController: ListCollectionViewControllerBase {
var coupons = [Coupon]()
var businesses = [Business]()
override func viewDidLoad() {
super.viewDidLoad()
collectionView?.backgroundColor = .white
collectionView?.register(CouponCell.self, forCellWithReuseIdentifier: listCellId)
collectionView?.register(MapHeaderCell.self, forSupplementaryViewOfKind: UICollectionElementKindSectionHeader, withReuseIdentifier: mapHeaderId)
getLocalBusinesses()
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
return CGSize(width: view.frame.width, height: 200)
}
//THIS IS WHERE I ADD ANNOTATIONS TO MAP
override func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
let header = collectionView.dequeueReusableSupplementaryView(ofKind: UICollectionElementKindSectionHeader, withReuseIdentifier: mapHeaderId, for: indexPath) as! MapHeaderCell
header.addAnnotations(businesses: businesses)
return header
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return coupons.count
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: listCellId, for: indexPath) as! CouponCell
cell.coupon = coupons[indexPath.item]
cell.hideFavoritesButton()
return cell
}
fileprivate func getLocalBusinesses() {
guard let latitude = UserDefaultConstants().latitude, let longitude = UserDefaultConstants().longitude else {
print("No latitude/longitude value stored for user")
return
}
let url = ConfigKeys.apiBaseURI + "business/nearby"
let params = ["latitude": latitude, "longitude": longitude]
let apiController = APIController(email: UserDefaultConstants().userEmail, token: UserDefaultConstants().userToken)
apiController.makeRequest(type: .get, url: url, parameters: params) { (success, error, data) in
if !success {
print("error with request: ", error ?? "in getLocalBusiness")
}
guard let data = data else {return}
guard let resultsArray = data["result"] as? [[String : Any]] else {return}
for result in resultsArray {
let business = Business(data: result)
self.businesses.append(business)
}
self.collectionView?.reloadData()
}
}
}
因此,为了重新迭代:我需要能够根据用户单击的注释在mapview下面的collection视图中加载业务数据。我在这里读到了一些解决方案,这些解决方案让我感到困惑,但却无法解决这个问题 找到了我需要的解决方案。如果有人需要,也可以发布。有点长,但在大多数情况下,这应该可以实现 创建此协议:
protocol MapHeaderCellDelgate {
func didSelectBusiness(id: Int)
}
在MapHeaderCell中创建一个变量,该变量是委托。在MKMapViewDelegate的DidSelect委托方法中,只需在任何视图控制器中传递所需的数据
var delegate: MapHeaderCellDelgate?
func mapView(_ mapView: MKMapView, didSelect view: MKAnnotationView) {
if let annotation = view.annotation as? BusinessAnnotation {
print("Your annotation title: \(annotation.businessId)");
guard let businessId = annotation.businessId else {return}
delegate?.didSelectBusiness(id: businessId)
}
}
在我的视图控制器中,我首先将collectionview与创建的协议(MapHeaderCellDelegate)相一致
在ViewForSupplementalElementOfKind方法中,确保将标题单元格委托设置为self
override func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
let header = collectionView.dequeueReusableSupplementaryView(ofKind: UICollectionElementKindSectionHeader, withReuseIdentifier: mapHeaderId, for: indexPath) as! MapHeaderCell
header.delegate = self
header.addAnnotations(businesses: businesses)
return header
}
最后,在protocol方法中,您现在可以使用刚刚传递的数据来执行任何您想要的操作。使用数据完成后,请确保重新加载collectionView,以便视图更新为您需要显示的任何内容
func didSelectBusiness(id: Int) {
someFunction(id: id)
}
func someFunction(id: Int) {
//DO STUFF
//...
collectionView?.reloadData()
}
func didSelectBusiness(id: Int) {
someFunction(id: id)
}
func someFunction(id: Int) {
//DO STUFF
//...
collectionView?.reloadData()
}