objective-c - MkMapView : Get lattitude and longitude when user moves the map

Question

i'am new to iphone MapView,when user moves the Map i need to get latitude and longitude of the visible region in iphone

Answer 1

centerCoordinate.latitude您可以使用 MKMapView :和的属性获取地图中心点的坐标 centerCoordinate.longitude。

例如 ：

CLLocationCoordinate2D coord = CLLocationCoordinate2DMake(
              map.centerCoordinate.latitude, map.centerCoordinate.longitude);

这就是您所说的“用户移动地图时我需要纬度和经度”的纬度和经度？

希望这会有所帮助……</p>

Answer 2

将此添加到您的Appdelegate.h

CLLocationManager *locationManager;

然后将这些行添加到您的Appdelegate.m (didFinishLaunchingWithOptions)

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

当您使用设备移动时，这将调用一个方法，

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
    CLLocation *currentLocation = [locations lastObject];

    NSString *latitude = [NSString stringWithFormat:@"%g", currentLocation.coordinate.latitude];
    NSString *longitude = [NSString stringWithFormat:@"%g", currentLocation.coordinate.longitude];

    NSMutableArray *temp = [[NSMutableArray alloc] initWithCapacity:0];
    [temp addObject:latitude];
    [temp addObject:longitude];

    NSUserDefaults *def = [NSUserDefaults standardUserDefaults];
    [def setObject:temp forKey:@"CLocation"];

    [temp release];
}

从此使用。

Answer 3

使用 MKMapView 的 .region 属性。

MKMapView *myMapView = [[MKMapView alloc] initWithFrame:...];

MKCoordinateRegion region = myMapView.region;

// Center of the screen as lat/long
// region.center.latitude
// region.center.longitude

// width and height of viewing area as lat/long
// region.span.latitudeDelta
// region.span.longitudeDelta

最大限度