viewForOverlay 从未被调用

Question

我可以查看分段的按钮。单击索引为“1”的按钮时，它应该显示带有一些叠加层的地图视图。因此，我有以下代码：

    {
        [_routeMap setHidden:NO];
        [self drawTheMap];
        [_routeMap setRegion:_region animated:YES];
        [_routeMap regionThatFits:_region];
        [_navBar setHidden:NO];
        NSLog(@"overlays: %@", _routeMap.overlays);
    }
    -(void)drawTheMap
    {
        [_routeMap setFrame:CGRectMake(0, 44, 320, 416)];
        for (int i=0; i<[_arrayOfPoints count]; i++) {
            CLLocation* location = [[CLLocation alloc] initWithLatitude:[[_arrayOfPoints objectAtIndex:i] latitude] 
                                                          longitude:[[_arrayOfPoints objectAtIndex:i] longitude]];

    ... 
        MKCircle * dot = [MKCircle circleWithCenterCoordinate:location.coordinate radius:radius];
            [_routeMap addOverlay:dot];

    ...  
    }
    ...
    }
    - (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
{
    MKCircleView *circleView = [[MKCircleView alloc] initWithCircle:overlay];
    circleView.lineWidth = 1.0;
    circleView.strokeColor = [UIColor orangeColor];
    [circleView setFillColor:[UIColor orangeColor]];

    return [circleView autorelease];
}

但 viewForOverlay 方法永远不会被调用=(。 NSLog 向我显示 mkmapview 包含一些叠加层。 有人可以帮助我吗？

Answer 1

在方法 -(void)drawTheMap 中，而不是 [_routeMap addOverlay:dot]; 尝试 [self addOverlay:dot];