iOS:用户位置变为pin

Question

我有一个奇怪的行为mapView:当我打开它,一切正常.将找到用户(蓝色圆圈)并且3个针脚就位.但是(我不知道为什么)一段时间后,蓝点变成了一个引脚 - 但只有当我的连接速度很慢时才会这样.

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;
}

Answer 1

请务必避免为内置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;
}

通过先检查用户位置注释,您可以提前返回nil而不是分配新的MKPinAnnotationView并返回它.

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation各州的文件:

如果annotation参数中的对象是MKUserLocation类的实例,则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.

Answer 2

Swift 3解决方案：

if annotation is MKUserLocation{
    return nil
}