更改CLLocation的坐标

Question

我刚接触Objective C，所以这可能是一个微不足道的问题：

初始化位置后：

CLLocation *currentPoint = [[CLLocation alloc] initWithLatitude:0 longitude:0]:

稍后如何更改纬度和经度？

Answer 1

CLLocation对象是不可变的(您不能更改它们)。根据文档：

通常，您使用CLLocationManager对象根据用户设备的最后已知位置创建此类的实例。但是，如果您想缓存自定义位置数据或获取两个不同坐标点之间的距离，则可以自己创建实例。

Answer 2

以下是如何修改CLLocation的示例：

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


    newLocation = [[[CLLocation alloc] initWithCoordinate:CLLocationCoordinate2DMake(newLocation.coordinate.latitude, -1.1874988592864875)
                                                 altitude:newLocation.altitude
                                       horizontalAccuracy:newLocation.horizontalAccuracy
                                         verticalAccuracy:newLocation.verticalAccuracy
                                            timestamp:newLocation.timestamp] autorelease];

下面是如何创建新CLLotation的另一个示例：

CLLocation *newLocation = [[[CLLocation alloc] initWithCoordinate:CLLocationCoordinate2DMake(41.44994138650804, -1.1874988592864875)
                                                   altitude:0
                                         horizontalAccuracy:0
                                           verticalAccuracy:0
                                                  timestamp:[NSDate date]] autorelease];