有人可以帮助我了解如何按距离组织我的表格视图,该距离已经在拉动并显示有关 mapItems 距用户位置多远的数据。还没有看到有人对实际的tableview给出答案。谢谢你。
import UIKit
import MapKit
class ListedMapTableViewController: UITableViewController, CLLocationManagerDelegate {
var mapItems: [MKMapItem]!
var userLocation = CLLocationManager()
let distanceFormatter = MKDistanceFormatter()
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return mapItems.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "resultCell", for: indexPath) as! ListedTableViewCell
// Configure the cell...
let row = indexPath.row
let item = mapItems[row]
cell.nameLabel.text = item.name
cell.detailLabel.text = item.phoneNumber
let distanceInMeters : Double = self.userLocation.location!.distance(from: mapItems[row].placemark.location!)
let distanceInMiles : Double = ((distanceInMeters.description as String).doubleValue * 0.00062137)
cell.distanceLabel.text = "\(distanceInMiles.string(2)) miles away"
return cell
}
}
//get string value of double without casting
extension String {
var doubleValue: Double {
return (self as NSString).doubleValue
}
}
//formats a double's decimal places
extension Double {
func string(_ fractionDigits:Int) -> String {
let formatter = NumberFormatter()
formatter.minimumFractionDigits = fractionDigits
formatter.maximumFractionDigits = fractionDigits
return formatter.string(from: NSNumber(value: self))!
}
}
编辑
import UIKit
import MapKit
class ListedMapTableViewController: UITableViewController, CLLocationManagerDelegate {
var mapItems: [MKMapItem]!
var userLocation = CLLocationManager()
let distanceFormatter = MKDistanceFormatter()
func sortedMapItems() -> [MKMapItem]! {
return self.mapItems.sorted(by: { (a, b) -> Bool in
return self.userLocation.location!.distance(from: a.placemark.location!) > self.userLocation.location!.distance(from: b.placemark.location!)
})
}
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return sortedMapItems().count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "resultCell", for: indexPath) as! ListedTableViewCell
// Configure the cell...
let row = indexPath.row
let item = sortedMapItems()[row]
cell.nameLabel.text = item.name
cell.detailLabel.text = item.phoneNumber
let distanceInMeters : Double = self.userLocation.location!.distance(from: sortedMapItems()[row].placemark.location!)
let distanceInMiles : Double = ((distanceInMeters.description as String).doubleValue * 0.00062137)
cell.distanceLabel.text = "\(distanceInMiles.string(2)) miles away"
return cell
}
}
//get string value of double without casting
extension String {
var doubleValue: Double {
return (self as NSString).doubleValue
}
}
//formats a double's decimal places
extension Double {
func string(_ fractionDigits:Int) -> String {
let formatter = NumberFormatter()
formatter.minimumFractionDigits = fractionDigits
formatter.maximumFractionDigits = fractionDigits
return formatter.string(from: NSNumber(value: self))!
}
}
第二次编辑
import UIKit
import MapKit
class ListedMapTableViewController: UITableViewController, CLLocationManagerDelegate {
var mapItems: [MKMapItem]!
var userLocation = CLLocationManager()
let distanceFormatter = MKDistanceFormatter()
override func viewDidLoad() {
super.viewDidLoad()
func sortMapItems() {
self.mapItems = self.mapItems.sorted(by: { (a, b) -> Bool in
return self.userLocation.location!.distance(from: a.placemark.location!) > self.userLocation.location!.distance(from: b.placemark.location!)
})
}
}
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return mapItems.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "resultCell", for: indexPath) as! ListedTableViewCell
// Configure the cell...
let row = indexPath.row
let item = mapItems[row]
cell.nameLabel.text = item.name
cell.detailLabel.text = item.phoneNumber
let distanceInMeters : Double = self.userLocation.location!.distance(from: mapItems[row].placemark.location!)
let distanceInMiles : Double = ((distanceInMeters.description as String).doubleValue * 0.00062137)
cell.distanceLabel.text = "\(distanceInMiles.string(2)) miles away"
return cell
}
}
//get string value of double without casting
extension String {
var doubleValue: Double {
return (self as NSString).doubleValue
}
}
//formats a double's decimal places
extension Double {
func string(_ fractionDigits:Int) -> String {
let formatter = NumberFormatter()
formatter.minimumFractionDigits = fractionDigits
formatter.maximumFractionDigits = fractionDigits
return formatter.string(from: NSNumber(value: self))!
}
}