这里我正在计算用户和司机的长途距离(以公里为单位)。现在我想在 TableView 中列出当前用户的驱动程序。目前我可以从驱动程序和用户端检索经纬度并计算它们之间的距离。
这里是使用的代码:
var requestArray = [requestModel]()
var bookRequestArray = [String]()
var DriverArray = [String]()
var subLoaclityArray = [String]()
var LocationArray = [String]()
var doc_ID : String = ""
var Start_Lat : String = ""
var Start_Long : String = ""
var Driver_Lat : String = ""
var Driver_Long : String = ""
var DriverLocation : CLLocation?
var userLocation : CLLocation?
var nearestLoaction : CLLocationDistance?
在这里获取数组中 firestore 的驱动程序
func loadDriverDoc(){
self.db.collection("Driver_details").getDocuments() { (querySnapshot, err) in
if let err = err {
print("Error getting documents: \(err)")
} else {
for document in querySnapshot!.documents {
print("driverdocument::::::::::\(document.documentID) => \(document.data())")
self.DriverArray.append(document.documentID)
let Driver_lat = document.data()["Driver_Lat"] as? String
print("Driver_lat:::::\(String(describing: Driver_lat))")
self.Driver_Lat = Driver_lat!
let Driver_long = document.data()["Driver_Long"] as? String
print("Driver_long:::::\(String(describing: Driver_long))")
self.Driver_Long = Driver_long!
self.DistanceCal()
}
DispatchQueue.main.async {
}
}
}
}
此处计算用户与司机之间的距离
func DistanceCal() {
DriverLocation = CLLocation(latitude: Double(Driver_Lat)!, longitude: Double(Driver_Long)!)
userLocation = CLLocation(latitude: Double(Start_Lat)!, longitude: Double(Start_Long)!)
//this is the distance between driverLocation and startLocation (in km)
let distance = (DriverLocation?.distance(from: userLocation!))!/1000
//Display the result in km
print(String(format: "The distance to driver is %.01fkm", distance))
if (distance <= 1000) {
} else if (distance <= 2000) {
} else if (distance <= 3000) {
} else {
}
}//DistanceCal
这里从firestore获取用户数据
func loadDoc() {
getFireBaseToken { token in
self.db.collection("Current_booking").getDocuments() { (querySnapshot, err) in
if let err = err {
print("Error getting documents: \(err)")
} else {
for document in querySnapshot!.documents {
print("document::::::::::\(document.documentID) => \(document.data())")
self.bookRequestArray.append(document.documentID)
print("doc::::\(self.bookRequestArray)")
let Start_lat = document.data()["Start_Lat"] as? String
print("Start_lat::::::\(String(describing: Start_lat))")
self.Start_Lat = Start_lat!
let Start_long = document.data()["Start_Long"] as? String
print("Start_long::::::\(String(describing: Start_long))")
self.Start_Long = Start_long!
self.loadDriverDoc()
}
DispatchQueue.main.async {
self.requestTableView.reloadData()
}
}
}
}//get firebase token
}//loadDoc
最佳答案
我建议创建一个新对象
struct Driver {
var docID: String!
var location: CLLocation!
var distanceFromUser: CLLocationDistance?
}
同样在变量声明的类之上创建一个驱动程序数组:
var drivers = [Driver]()
您下载所有驱动程序并初始化驱动程序的结构，之后为每个驱动程序计算与当前用户之间的距离，并将 distanceFromUser 分配给每个驱动程序。这样做之后你应该排序
drivers.sort(by: {($0.distanceFromUser ?? 999999.9) < ($1.distanceFromUser ?? 999999.9)})
tableView.reloadData()
我给了 999999.9，因为 distanceFromUser 是可选的，如果没有计算，驱动程序将留在列表的底部。在 tableView(_:cellForRowAt:) 中，您应该访问 drivers[indexPath.row] 或 drivers[indexPath.section]，具体取决于您使用哪种方式使用 TableView 。
关于ios - 如何在表格 View 中列出距离当前用户位置最近的用户 - iOS swift？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/49894896/