xcode Swift 中“我的位置”按钮的实现
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Implementation of 'My Location' button in Swift
提问by DP27
I am currently stuck while attempting to figure out how to add a button on my map that will redisplay a user's current location if they stray away from it on the map. At the moment I have the code written below that displays the user's current location.
我目前在试图弄清楚如何在我的地图上添加一个按钮时被卡住，如果用户在地图上偏离它，该按钮将重新显示用户的当前位置。目前，我在下面编写了显示用户当前位置的代码。
import UIKit
import MapKit
import CoreLocation
class GameViewController: UIViewController,CLLocationManagerDelegate
{
var lastUserLocation: MKUserLocation?
@IBOutlet weak var Map: MKMapView!
let manager = CLLocationManager()
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let location = locations[0]
let span:MKCoordinateSpan = MKCoordinateSpanMake(0.00775, 0.00775)
let myLocation: CLLocationCoordinate2D = CLLocationCoordinate2DMake(location.coordinate.latitude,location.coordinate.longitude)
let region: MKCoordinateRegion = MKCoordinateRegionMake(myLocation, span)
Map.setRegion(region, animated: true)
self.Map.showsUserLocation = true
manager.stopUpdatingLocation()
}
override func viewDidLoad() {
super.viewDidLoad()
manager.delegate = self
manager.desiredAccuracy = kCLLocationAccuracyBest
manager.requestAlwaysAuthorization()
manager.startUpdatingLocation()
}
@IBAction func refLocation(_ sender: Any) {
print("click")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
}
What I am unsure of, is what code to put inside of the @IBAction function that will allow the map to re-center to the user's current location if they stray from it while looking elsewhere.
我不确定的是，在@IBAction 函数中放置什么代码，如果他们在寻找其他地方时偏离它，它将允许地图重新居中到用户的当前位置。
回答by Nirav D
For that you can call again startUpdatingLocationmethod of CLLocationManageron your Buttonaction.
为此，您可以在您的操作上再次调用startUpdatingLocation方法。CLLocationManagerButton
To get the the correct current location of user you need to access the lastobject from the locationarray in didUpdateLocationsmethod.
要获取用户的正确当前位置，您需要last从方法中的location数组访问对象didUpdateLocations。
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
//Access the last object from locations to get perfect current location
if let location = locations.last {
let span = MKCoordinateSpanMake(0.00775, 0.00775)
let myLocation = CLLocationCoordinate2DMake(location.coordinate.latitude,location.coordinate.longitude)
let region = MKCoordinateRegionMake(myLocation, span)
Map.setRegion(region, animated: true)
}
self.Map.showsUserLocation = true
manager.stopUpdatingLocation()
}
Now simply call startUpdatingLocationon your button action.
现在只需调用startUpdatingLocation您的按钮操作。
@IBAction func refLocation(_ sender: Any) {
manager.startUpdatingLocation()
}
