6

我有一个奇怪行为的 mapView：当我打开它时，一切正常。用户（带圆圈的蓝色）将被定位并且 3 个引脚就位。但是（我不知道为什么）一段时间后，蓝点变成了一个针 - 但只有当我的连接速度很慢时。

这是我得到的：

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
    MKPinAnnotationView *pinView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:@"pinView"];

    if (!pinView && ![annotation isKindOfClass:[MKUserLocation class]])
    {
        pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"pinView"];
        pinView.pinColor = MKPinAnnotationColorRed;
        pinView.animatesDrop = YES;
        pinView.canShowCallout = YES;

        UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
        pinView.rightCalloutAccessoryView = rightButton;

        if (annotation == self.locationZH1)
        {
            [pinView setTag:1];
        }
        else if (annotation == self.locationZH2)
        {
            [pinView setTag:2];
        }
        else if (annotation == self.locationZH3)
        {
            [pinView setTag:3];
        }
        else if (annotation == self.locationLU1)
        {
            [pinView setTag:4];
        }
    }
    else
    {
        pinView.annotation = annotation;
    }

    return pinView;
}
4

3 回答 3

11

请务必避免为内置的用户位置标记提供注释视图。

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
{
    //check annotation is not user location
    if([annotation isEqual:[mapView userLocation]])
    {
        //bail
        return nil;
    }

    static NSString *annotationViewReuseIdentifer = @"map_view_annotation";

    //dequeue annotation view
    MKPinAnnotationView *annotationView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:annotationViewReuseIdentifer];

    if(!annotationView)
    {
        annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:annotationViewReuseIdentifer];
    }

    //set annotation view properties
    [annotationView setAnnotation:annotation];

    return annotationView;
}

通过更早地检查用户位置注释，您可以为返回提供提前退出，nil而不是分配一个新的MKPinAnnotationView并返回它。

状态的文档- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation：

如果 annotation 参数中的对象是 MKUserLocation 类的实例，您可以提供自定义视图来表示用户的位置。要使用默认系统视图显示用户的位置，请返回 nil。

于 2013-07-03T09:00:48.770 回答
6

斯威夫特 3 解决方案：

if annotation is MKUserLocation{
    return nil
}
于 2017-04-28T14:30:50.577 回答
0

您需要在 annotation == mapView.userLocation 时返回 nil 以显示用户位置的蓝点及其周围的圆圈

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id      <MKAnnotation>)annotation

    MKPinAnnotationView *pinView = (MKPinAnnotationView *)[mapView  dequeueReusableAnnotationViewWithIdentifier:@"pinView"];

    if (!pinView && ![annotation isKindOfClass:[MKUserLocation class]])
    {
        pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"pinView"];
        pinView.pinColor = MKPinAnnotationColorRed;
        pinView.animatesDrop = YES;
        pinView.canShowCallout = YES;

        UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
        pinView.rightCalloutAccessoryView = rightButton;

        if (annotation == self.locationZH1)
        {
            [pinView setTag:1];
        }
        else if (annotation == self.locationZH2)
        {
            [pinView setTag:2];
        }
        else if (annotation == self.locationZH3)
        {
            [pinView setTag:3];
        }
        else if (annotation == self.locationLU1)
        {
            [pinView setTag:4];
        }
        return pinView;
    }
    else
    {
        pinView.annotation = annotation;
        return Nil;
    }
}
于 2014-03-05T06:56:10.020 回答