On mkuserlocation, how do I show my own custom mes

问题:

I want to show a custom message instead of "My Location" in viewForAnnotation. How do I do this?

Thanks Deshawn

回答1:

In the delegate of your MKMapView, implement the method mapView:viewForAnnotation and check if the annotation is of type MKUserLocation. If yes, change the title and subtitle properties of the annotation. The callout will automatically pull the new values. Or you can create a totally new view and return it here.

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {
    if ([annotation isKindOfClass:[MKUserLocation class]]) {
        annotation.title = @"I am here";
        return nil;
    }
    return nil;
}

Disclaimer: I haven't tested this code.

回答2:

It can be done by updating Title property of MKUserLocation.

As MKAnnotation protocol doesn't require making Title a property, cast annotation passed as an argument to MKUserLocation and set the property

- (MKAnnotationView*)mapView:(MKMapView *)mapView viewForAnnotation:    (id<MKAnnotation>)annotation {
    if ([annotation isKindOfClass:[MKUserLocation class]]) {
        [(MKUserLocation*)annotation setTitle: @"I am here"];
        return nil;
    }
    return nil;
}

回答3:

Simply referring directly to it works too, like this...

mapView.userLocation.title = @"I am here";

This can be done from anywhere you have a reference to the map view.