标签: showuserlocation

如果我想在地图上显示用户位置,并在同一时间记录用户的位置,它是一个好主意,添加一个观察者userLocation.location并记录位置,或者我应该仍然使用CLLocationManager用于记录用户位置和使用方法mapView.showUserLocation显示用户的当前位置(蓝色指示灯)？我想显示MapKit API支持的默认蓝色指示器.

另外,这是一个粗略的示例代码:

- (void)viewDidLoad {
    ...

    locationManager = [[CLLocationManager alloc] init]; 
    locationManager.desiredAccuracy = kCLLocationAccuracyBest; 
    locationManager.distanceFilter = DISTANCE_FILTER_VALUE;
    locationManager.delegate = self; 
    [locationManager startUpdatingLocation];

    myMapView.showUserLocation = YES;
    [myMapView addObserver:self forKeyPath:@"userLocation.location" options:0 context:nil];

    ...
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    // Record the location information
    // ...
}

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { 
    NSLog(@"%s begins.", __FUNCTION__);

    // Make sure that the location returned has the desired accuracy
    if (newLocation.horizontalAccuracy <= manager.desiredAccuracy)
        return;

    // Record the …

我创建了一个地图，右上角有一个用户跟踪按钮。我想知道如何在加载时默认将状态设置为“followWithHeadlights”，以便它跟随用户当前位置，就像在 GPS 上一样？

负载时的当前行为： 按钮当前行为

加载时所需的行为： 按钮所需的行为

代码片段：

func setUserTrackingButton() {

    // Mapkit tracking button
    let trackingButton: MKUserTrackingBarButtonItem = MKUserTrackingBarButtonItem.init(mapView: mapView)
    trackingButton.customView?.tintColor = UIColor(red:0.01, green:0.81, blue:0.37, alpha:1.0)
    trackingButton.customView?.frame.size = CGSize(width: 50, height: 50)

    let toolBarFrame = CGRect(origin: CGPoint(x: 0, y: 0) , size: CGSize(width: 50, height: 50))
    let toolbar = UIToolbar.init(frame: toolBarFrame)
    toolbar.barTintColor = UIColor.white
    toolbar.isTranslucent = true
    let flex: UIBarButtonItem = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: self, action: nil)
    toolbar.items = [flex, trackingButton, flex]

    let origin = CGPoint(x: self.view.frame.size.width - 85, …