iOS 使用 CLLocation 和 MapView 一起获取坐标和更新地图

Posted 2023-03-05

【中文标题】iOS 使用 CLLocation 和 MapView 一起获取坐标和更新地图

【英文标题】：iOS Using CLLocation & MapView together to get coordinates and update map

【发布时间】：2014-01-14 14:53:00

【问题描述】：

我有一个应用程序需要做两件事；

获取当前位置 将 Mapview 更新到该位置

我正在使用以下代码；

-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation     *)newLocation fromLocation:(CLLocation *)oldLocation

    CLLocation *currentLocation = newLocation;
    if (currentLocation != nil) 
    NSLog(@"%.8f", currentLocation.coordinate.longitude);
    NSLog(@"%.8f", currentLocation.coordinate.latitude);
    NSLog(@"%f", currentLocation.speed);

    MKCoordinateRegion mapRegion;
    mapRegion.center.longitude = currentLocation.coordinate.longitude;
    mapRegion.center.latitude = currentLocation.coordinate.latitude;
    mapRegion.span.latitudeDelta = 0.03;
    mapRegion.span.longitudeDelta = 0.03;
    [_mapView setRegion:mapRegion animated: YES];

一切都如我所料，除了一件事。当 MapView 区域更新时，MAP 会移动，但 PIN 不会。最终，用户 pin 离开了屏幕，因为地图正在沿着坐标移动。

任何帮助将不胜感激。

【参考方案1】：

在您设置_mapView 区域的位置下方，您还应该使用currentLocation 创建一个新注释并将其添加到_mapView。代码应该是这样的，

-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation     *)newLocation fromLocation:(CLLocation *)oldLocation

    CLLocation *currentLocation = newLocation;
    if (currentLocation != nil) 
    NSLog(@"%.8f", currentLocation.coordinate.longitude);
    NSLog(@"%.8f", currentLocation.coordinate.latitude);
    NSLog(@"%f", currentLocation.speed);

    MKCoordinateRegion mapRegion;
    mapRegion.center.longitude = currentLocation.coordinate.longitude;
    mapRegion.center.latitude = currentLocation.coordinate.latitude;
    mapRegion.span.latitudeDelta = 0.03;
    mapRegion.span.longitudeDelta = 0.03;
    [_mapView setRegion:mapRegion animated: YES];

    MyAnnotation *ant = [[MyAnnotation alloc] initWithCoordinate:currentLocation.coordinate];
    [_mapView addAnnotation:ant];