我有 8 个假用户，包括我在内，在 Parse 上有不同的位置。如果用户按下我的 map 上的注释，我想获取一个包含其 user.username 的数组，以打开与其中选择的用户的直接聊天，并将 user.username 发送到我的下一个 NewChatVC receiver var 通过 prepareForSegue。为了实现这一目标，我尝试创建一个数组 closeUsersArray，首先从较接近的人中选择 10 个人。以 km 为单位的距离过滤器似乎没问题，但是当我尝试填充数组时，在控制台中我得到了很多重复，而不是只有 8 个名称:
self.closeUsersArray.append(user.username!) //MARK: Test
或一个组/数组或充满这 8 个名称的重复，发生这种情况:
println("this is the array of users * \(self.closeUsersArray) *") //MARK: Test
更新
我发现在 locationManager 代码中使用 println("evaluates") 进行多次计算，调用 displayLocationInfo 并调用 createAnnotations 多次。我觉得我应该尽量明确条件，也许太多了
在我的文件下面，提前致谢
import UIKit
import MapKit
import CoreLocation
import Parse
class MapViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate, UIActionSheetDelegate {
@IBOutlet weak var mapView: MKMapView!
@IBOutlet weak var segmentedControl: UISegmentedControl!
let locationManager = CLLocationManager()
let kDefaultKmForUserOnMap = 50.0 //default value
var limitNumberForQueryResults = 10
var closeUsersArray:[String] = [] //MARK: Test
let defaults = NSUserDefaults.standardUserDefaults()
var withinKms : Double!
override func viewDidLoad()
{
super.viewDidLoad()
//MARK: checks if the variable is nil, if yes, attributes a value
if defaults.doubleForKey("withinKms") <= 0 {
defaults.setDouble(kDefaultKmForUserOnMap, forKey: "withinKms")
defaults.synchronize()
withinKms = defaults.doubleForKey("withinKms")
println("MapViewController - viewDidLoad - var kKmRadiusForUsersOnMap was never set before, so now is set to \(withinKms) ")
} else {
withinKms = defaults.doubleForKey("withinKms")
println("MapViewController - viewDidLoad - else occurred and var test is \(withinKms)")
}
self.locationManager.delegate = self
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
self.locationManager.requestWhenInUseAuthorization()
self.locationManager.startUpdatingLocation()
self.mapView.showsUserLocation = true
}
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
}
override func viewDidAppear(animated: Bool)
{
super.viewDidAppear(animated)
self.segmentedControl.selectedSegmentIndex = 0
withinKms = self.defaults.doubleForKey("withinKms")
println("MapViewController - viewDidAppear - radius shown on map is * \(withinKms) * ")
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "fromMapToNewChats" {
//MARK: Hint - this is the standard way to pass data to a NOT embedded VC
var nextVC : NewChatsFromHomeVC = segue.destinationViewController as! NewChatsFromHomeVC
nextVC.calledFromVC = "MapViewController"
nextVC.receivedReceiver = "Specific User"
// // nextVC.filterToParse = self.channleKeywordReceived
}
}
//************************************************
//MARK: send message by touching an annotation
func mapView(mapView: MKMapView!, didSelectAnnotationView view: MKAnnotationView!) {
println("anotation pressed: \(view.annotation.title)")
self.performSegueWithIdentifier("fromMapToNewChats", sender: self)
}
//************************************************
// MARK: - Location Delegate Methods
func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!)
{
let point = PFGeoPoint(latitude:manager.location.coordinate.latitude, longitude:manager.location.coordinate.longitude)
let location = locations.last as! CLLocation
let center = CLLocationCoordinate2D(latitude: location.coordinate.latitude, longitude: location.coordinate.longitude)
let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 1, longitudeDelta: 1))
self.mapView.setRegion(region, animated: true)
CLGeocoder().reverseGeocodeLocation(manager.location, completionHandler: {(placemarks, error)->Void in
if (error != nil)
{
println("Error: " + error.localizedDescription)
return
}
if placemarks.count > 0
{
let pm = placemarks[0] as! CLPlacemark
self.displayLocationInfo(pm, point: point)
println("evaluates 3")
}
else
{
println("Error with the data.")
}
})
}
func displayLocationInfo(placemark: CLPlacemark, point: PFGeoPoint)
{
self.locationManager.stopUpdatingLocation()
self.createAnnotations(point, address: "\(placemark.locality) \(placemark.administrativeArea) \(placemark.postalCode) \(placemark.country)")
}
func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!)
{
println("Error: " + error.localizedDescription)
}
// timelineMessageDataArray.removeAll(keepCapacity: true) //erase previus contents
// println("timelineData cleared")
// MARK: - Create Annotation
func createAnnotations(point: PFGeoPoint, address: String)
{
var query = PFUser.query()
query?.whereKey("location", nearGeoPoint: point, withinKilometers: withinKms)
query?.orderByAscending("location") //MARK: Put list in order
query?.limit = self.limitNumberForQueryResults
query?.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in
if error == nil
{
for(var i = 0; i < objects!.count; i++)
{
let user = objects![i] as! PFUser
var myHomePin = MKPointAnnotation()
let userPoint = user["location"] as! PFGeoPoint
myHomePin.coordinate = CLLocationCoordinate2DMake(userPoint.latitude, userPoint.longitude)
myHomePin.title = user.username
myHomePin.subtitle = address
self.mapView.addAnnotation(myHomePin)
// self.closeUsersArray.append(user.username!) //MARK: Test
}
// println("this is the array of users * \(self.closeUsersArray) *") //MARK: Test
}
else
{
println("Error: " + error!.localizedDescription)
}
})
}
// MARK: - Action Delegate
func actionSheet(actionSheet: UIActionSheet, clickedButtonAtIndex buttonIndex: Int)
{
switch(buttonIndex)
{
case 0: //Destructive button
break
case 1: // 25.0 Km
// NSUserDefaults.standardUserDefaults().setDouble(25.0, forKey: "withinKms")
self.defaults.setDouble(50.0, forKey: "withinKms")
self.defaults.synchronize()
self.locationManager.startUpdatingLocation()
break;
case 2: // 50.0 Km
self.defaults.setDouble(100.0, forKey: "withinKms")
self.defaults.synchronize()
self.locationManager.startUpdatingLocation()
break;
case 3: // 100.0 Km
self.defaults.setDouble(200.0, forKey: "withinKms")
self.defaults.synchronize()
self.locationManager.startUpdatingLocation()
break;
case 4: // 200.0 Km
self.defaults.setDouble(300.0, forKey: "withinKms")
self.defaults.synchronize()
self.locationManager.startUpdatingLocation()
break;
default:
break;
}
}
// MARK: - Actions
@IBAction func homeAction(sender: AnyObject)
{
self.dismissViewControllerAnimated(true, completion: nil)
}
@IBAction func indexChanged(sender: UISegmentedControl)
{
switch segmentedControl.selectedSegmentIndex
{
case 0:
println("map clicked") //MARK: this one never evaluates!
case 1:
self.performSegueWithIdentifier("showListView", sender: self)
println("showListView clicked")
default:
break;
}
}
@IBAction func radiusAction(sender: UIButton)
{
// UIActionSheet(title: nil, delegate: self, cancelButtonTitle: "cancel", destructiveButtonTitle: nil, otherButtonTitles: "25.0 Miles", "50.0 Miles", "100.0 Miles", "200.0 Miles").showInView(self.view)
UIActionSheet(title: nil, delegate: self, cancelButtonTitle: "cancel", destructiveButtonTitle: nil, otherButtonTitles: "50 Km", "100 Km", "200 Km", "300 Km").showInView(self.view)
}
@IBAction func profileButton(sender: UIBarButtonItem) {
// let vc = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("ProfileNavControllerID") as? UIViewController
//
// self.presentViewController(vc!, animated: true, completion: nil)
let vc = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("ProfileNavControllerID") as! UIViewController
self.presentViewController(vc, animated: true, completion: nil)
}
}
最佳答案
不确定这是否可以解决问题，但更改您的 for 循环可能会有所帮助。试试这个:
for nearbyUser in objects {
let user = nearbyUser.objectForKey("username")
var myHomePin = MKPointAnnotation()
let userPoint = nearbyUser.objectForKey("location") as! PFGeoPoint
myHomePin.coordinate = CLLocationCoordinate2DMake(userPoint.latitude, userPoint.longitude)
myHomePin.title = ("\(user)")
myHomePin.subtitle = address
self.mapView.addAnnotation(myHomePin)
self.closeUsersArray.append(user) //MARK: Test
}
也许可以尝试类似的事情
关于ios - 如何限制Parse上查询的结果在 `query.limit`后面，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32967993/