Display a user's approximate location | Maps SDK v6 | iOS

A newer version of the Maps SDK is available

This page uses v6.4.1 of the Mapbox Maps SDK. A newer version of the SDK is available. Learn about the latest version, v11.7.0, in the Maps SDK documentation.

Displaying approximate user location is only available on iOS 14+. For more information about requesting location data from users, see Apple's location services guide.

Swift

Objective C

ViewController

github View on GitHub

Swift

Objective C


import Mapbox

class ViewController: UIViewController, MGLMapViewDelegate {
    var mapView: MGLMapView?
    var preciseButton: UIButton?

    override func viewDidLoad() {
        super.viewDidLoad()

        let mapView = MGLMapView(frame: view.bounds)
        mapView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        mapView.delegate = self
        mapView.showsUserLocation = true
        self.mapView = mapView

        view.addSubview(mapView)
    }

    /**
        In order to enable the alert that requests temporary precise location,
        please add the following key to your info.plist
        `NSLocationTemporaryUsageDescriptionDictionary`

        You must then add
        `MGLAccuracyAuthorizationDescription`
        as a key in the Privacy - Location Temporary Usage Description Dictionary
     */
    @available(iOS 14, *)
    func mapView(_ mapView: MGLMapView, didChangeLocationManagerAuthorization manager: MGLLocationManager) {
        guard let accuracySetting = manager.accuracyAuthorization?() else { return }

        if accuracySetting == .reducedAccuracy {
            addPreciseButton()
        } else {
            removePreciseButton()
        }
    }

    @available(iOS 14, *)
    func addPreciseButton() {
        let preciseButton = UIButton(frame: CGRect.zero)
        preciseButton.setTitle("Turn Precise On", for: .normal)
        preciseButton.backgroundColor = .gray

        preciseButton.addTarget(self, action: #selector(requestTemporaryAuth), for: .touchDown)
        self.view.addSubview(preciseButton)
        self.preciseButton = preciseButton

        // constraints
        preciseButton.translatesAutoresizingMaskIntoConstraints = false
        preciseButton.widthAnchor.constraint(equalToConstant: 150.0).isActive = true
        preciseButton.heightAnchor.constraint(equalToConstant: 40.0).isActive = true
        preciseButton.topAnchor.constraint(equalTo: view.topAnchor, constant: 100.0).isActive = true
        preciseButton.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
    }

    @available(iOS 14, *)
    @objc private func requestTemporaryAuth() {
        guard let mapView = self.mapView else { return }

        let purposeKey = "MGLAccuracyAuthorizationDescription"
        mapView.locationManager.requestTemporaryFullAccuracyAuthorization!(withPurposeKey: purposeKey)
    }

    private func removePreciseButton() {
        guard let button = self.preciseButton else { return }
        button.removeFromSuperview()
        self.preciseButton = nil
    }
}

ViewController

github View on GitHub

Swift

Objective C


#import "ViewController.h"
@import Mapbox;
@interface ViewController () <MGLMapViewDelegate>
@property (nonatomic) MGLMapView *mapView;
@property (nonatomic) UIButton *preciseButton;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    MGLMapView *mapView = [[MGLMapView alloc] initWithFrame:self.view.bounds];
    mapView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    mapView.delegate = self;
    mapView.showsUserLocation = YES;
    self.mapView = mapView;

    [self.view addSubview:mapView];
}

/**
    In order to enable the alert that requests temporary precise location,
    please add the following key to your info.plist
    @c NSLocationTemporaryUsageDescriptionDictionary

    You must then add
    @c MGLAccuracyAuthorizationDescription
    as a key in the Privacy - Location Temporary Usage Description Dictionary
 */
- (void)mapView:(MGLMapView *)mapView didChangeLocationManagerAuthorization:(id<MGLLocationManager>)manager {
    if (@available(iOS 14, *)) {
        if (manager.accuracyAuthorization == CLAccuracyAuthorizationReducedAccuracy) {
            [self addPreciseButton];
        } else {
            [self removePreciseButton];
        }
    }
}

- (void)addPreciseButton {
    UIButton *preciseButton = [UIButton buttonWithType:UIButtonTypeCustom];
    [preciseButton setTitle:@"Turn Precise On" forState:UIControlStateNormal];
    preciseButton.backgroundColor = UIColor.grayColor;

    [preciseButton addTarget:self action:@selector(requestTemporaryAuth) forControlEvents:UIControlEventTouchDown];
    self.preciseButton = preciseButton;
    [self.view addSubview:preciseButton];

    // constraints
    [preciseButton setTranslatesAutoresizingMaskIntoConstraints:NO];
    [preciseButton.widthAnchor constraintEqualToConstant:150.0].active = YES;
    [preciseButton.heightAnchor constraintEqualToConstant:40.0].active = YES;
    [preciseButton.topAnchor constraintEqualToAnchor:self.view.topAnchor constant:100.0].active = YES;
    [preciseButton.centerXAnchor constraintEqualToAnchor:self.view.centerXAnchor].active = YES;
}

- (void)requestTemporaryAuth {
    if (self.mapView != nil) {
        NSString *purposeKey = @"MGLAccuracyAuthorizationDescription";
        if (@available(iOS 14, *)) {
            [self.mapView.locationManager requestTemporaryFullAccuracyAuthorizationWithPurposeKey:purposeKey];
        }
    }
}

- (void)removePreciseButton {
    if (self.preciseButton != nil) {
        [self.preciseButton removeFromSuperview];
        self.preciseButton = nil;
    }
}

@end

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