didAddAnnotationViews 不总是被调用
我将 MKAnnotation 委托处理程序类添加到 MKMapView 中，如下所示。
MapAnnotation *anAnnotation = [[[MapAnnotation alloc] initWithCoordinate:coord] autorelease];
[myMapView addAnnotation:anAnnotation];
MapAnnotation 实现了 MKAnnotation。
然而 didAddAnnotationViews 并不总是被调用。有时（很少）会，有时则不会。我检查了几个地方并且我已经正确使用了这个。它也取决于跨度属性吗？
MKCoordinateRegion 区域； MKCoordinateSpan 跨度； span.latitudeDelta=0.005f; span.longitudeDelta=0.005f;
CLLocationCoordinate2D location;
location.latitude = searchLocation.coordinate.latitude;
location.longitude = searchLocation.coordinate.longitude;
region.span=span;
region.center=location;
[myMapView setRegion:region animated:TRUE];
[myMapView regionThatFits:region];
这段代码有什么问题吗？
I added a MKAnnotation delegate handler class into a MKMapView like this.
MapAnnotation *anAnnotation = [[[MapAnnotation alloc] initWithCoordinate:coord] autorelease];
[myMapView addAnnotation:anAnnotation];
The MapAnnotation implements the MKAnnotation.
However didAddAnnotationViews doesnt get called always. Sometimes (rarely) it does and sometimes its not. I checked few places and I have used this correctly. Does it depends on span attributes as well?
MKCoordinateRegion region;
MKCoordinateSpan span;
span.latitudeDelta=0.005f;
span.longitudeDelta=0.005f;
CLLocationCoordinate2D location;
location.latitude = searchLocation.coordinate.latitude;
location.longitude = searchLocation.coordinate.longitude;
region.span=span;
region.center=location;
[myMapView setRegion:region animated:TRUE];
[myMapView regionThatFits:region];
Whats wrong with this code?
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该委托方法是为当前可见的注释（即当前显示在屏幕上的地图区域内的注释）调用的。
This delegate method is called for annotations that are currently visible i.e. those that are within the map region that is currently displayed on the screen.