【发布时间】：2023-01-25 02:39:17
【问题描述】：
我正在构建一个类似 uber 的应用程序，它会在用户输入时显示推荐地址。最初，当我开始构建应用程序时，它会提示用户的位置，并且自动完成功能很智能，因为它会首先搜索本地地址。我意识到拥有用户的位置是不必要的，因为这更像是一种乘车请求服务，而不是实时服务。删除用户的位置后，自动完成变得非常差（预期）。这个应用程序将在一个非常特定的地区使用，我希望自动完成是智能的。有没有办法在不知道用户位置的情况下为 MKLocalSearch 设置区域？
这是检索自动完成地址的类...
import Foundation
import MapKit
class LocationSearchViewModel: NSObject, ObservableObject{
@Published var totalPrice:String = "Loading..."
@Published var results = [MKLocalSearchCompletion]()
@Published var fromResult = MKLocalSearchCompletion()
@Published var toResult = MKLocalSearchCompletion()
@Published var fromAveLocation : AveLocation?
@Published var toAveLocation : AveLocation?
private let searchCompleter = MKLocalSearchCompleter()
@Published var fromQueryFragment: String = ""{
didSet{
searchCompleter.queryFragment = fromQueryFragment
}
}
@Published var toQueryFragment: String = ""{
didSet{
searchCompleter.queryFragment = toQueryFragment
}
}
override init() {
super.init()
searchCompleter.delegate = self
searchCompleter.queryFragment = fromQueryFragment
}
func selectLocation(_ localSearch: MKLocalSearchCompletion,_ localSearch2: MKLocalSearchCompletion){
locationSearch(forLocalSearchCompletion: localSearch){response, error in
self.locationSearch(forLocalSearchCompletion: localSearch2){response2, error2 in
if let error = error{
print("DEBUG: Location search failed with error \(error.localizedDescription)")
return
}
if let error2 = error2{
print("DEBUG: Location search failed with error \(error2.localizedDescription)")
return
}
guard let item = response?.mapItems.first else{return}
guard let item2 = response2?.mapItems.first else{return}
let coordinate = item.placemark.coordinate
let coordinate2 = item2.placemark.coordinate
self.fromAveLocation = AveLocation(title: localSearch.title, subtitle: localSearch.subtitle, coordinate: coordinate)
self.toAveLocation = AveLocation(title: localSearch2.title, subtitle: localSearch2.subtitle, coordinate: coordinate2)
}
}
}
func locationSearch(forLocalSearchCompletion localSearch: MKLocalSearchCompletion,
completion: @escaping MKLocalSearch.CompletionHandler){
let searchRequest = MKLocalSearch.Request()
searchRequest.naturalLanguageQuery = localSearch.title.appending(localSearch.subtitle)
let search = MKLocalSearch(request: searchRequest)
search.start(completionHandler: completion)
}
}
extension LocationSearchViewModel: MKLocalSearchCompleterDelegate{
func completerDidUpdateResults(_ completer: MKLocalSearchCompleter) {
self.results = completer.results
}
}
这是它被调用的地方......
ScrollView{
VStack(alignment: .leading){
ForEach(viewModel.results, id: \.self){ result in
LocationSearchResultCell(title: result.title, subtitle: result.subtitle)
.onTapGesture {
switch whereIsUser {
case .from:
viewModel.fromQueryFragment = result.title
viewModel.fromResult = result
whereIsUser = .to
focusedField = .to
break
case .lookingFrom:
viewModel.fromQueryFragment = result.title
viewModel.fromResult = result
whereIsUser = .to
focusedField = .to
break
case .to:
viewModel.toQueryFragment = result.title
viewModel.toResult = result
whereIsUser = .done
withAnimation(.spring()){
mapState = .locationSelected
viewModel.selectLocation(viewModel.fromResult, viewModel.toResult)
}
break
case .lookingTo:
viewModel.toQueryFragment = result.title
viewModel.toResult = result
whereIsUser = .done
withAnimation(.spring()){
mapState = .locationSelected
viewModel.selectLocation(viewModel.fromResult, viewModel.toResult)
}
break
default:
break
}
}
}
}
}
检查以确保模拟器位置设置在正确的位置。以防 MKLocalSearch 在没有获取用户位置的情况下工作。
【问题讨论】：
标签： ios swift mapkit mkmapview