MKMapView缩放到viewDidLoad上的用户位置？

问题描述

我尝试在视图加载后将地图缩放到用户的当前位置，但我收到错误** *由于未捕获异常而终止应用NSInvalidArgumentException，原因：无效的地区'。

I'm trying to zoom a map into the user's current location once the view loads, but I'm getting the error "** * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Invalid Region '" when the view loads. Please can someone help?

干杯！

- (void)viewDidLoad
{
    [super viewDidLoad];

    MKCoordinateRegion mapRegion;
    mapRegion.center.latitude = map.userLocation.coordinate.latitude;
    mapRegion.center.longitude = map.userLocation.coordinate.longitude;
    mapRegion.span.latitudeDelta = 0.2;
    mapRegion.span.longitudeDelta = 0.2;
    [map setRegion:mapRegion animated: YES];
}

推荐答案

$ c> showsUserLocation = YES ？ 如果设置为 NO ，则MKMapView 不会更新位置。因此，请确保这一点。

did you set showsUserLocation = YES? MKMapView won't update the location if it is set to NO. So make sure of that.

这很可能是 MKMapView 对象没有用户位置。要做到正确，你应该采用 MKMapViewDelegate 协议并实现 mapView：didUpdateUserLocation：

It is very likely that the MKMapView object doesn't have the user location yet. To do right, you should adopt MKMapViewDelegate protocol and implement mapView:didUpdateUserLocation:

map.delegate = self;

...
-(void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
{
    MKCoordinateRegion mapRegion;
    mapRegion.center = mapView.userLocation.coordinate;
    mapRegion.span.latitudeDelta = 0.2;
    mapRegion.span.longitudeDelta = 0.2;

    [mapView setRegion:mapRegion animated: YES];
}

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