【发布时间】:2012-02-27 08:29:11
【问题描述】:
我一直在尝试让多个地图图钉显示在地图上,但它不起作用。谁能帮我吗?我正在使用下面的代码:
- (void)viewDidLoad
{
// Set some coordinates for our position (Buckingham Palace!)
CLLocationCoordinate2D location;
location.latitude = (double) 51.501468;
location.longitude = (double) -0.141596;
// Add the annotation to our map view
MapViewAnnotation *newAnnotation = [[MapViewAnnotation alloc] initWithTitle:@"Buckingham Palace" andCoordinate:location];
[self.mapView addAnnotation:newAnnotation];
}
- (void)mapView:(MKMapView *)mv didAddAnnotationViews:(NSArray *)views
{
MKAnnotationView *annotationView = [views objectAtIndex:0];
id <MKAnnotation> mp = [annotationView annotation];
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance([mp coordinate], 1500, 1500);
[mv setRegion:region animated:YES];
[mv selectAnnotation:mp animated:YES];
}
【问题讨论】:
-
在 viewDidLoad 中,检查 mapView 是否为 nil。是否调用了 didAddAnnotationViews(将 NSLog 放入其中进行检查)?
标签: iphone xcode xcode4 ios4 mapkit