iOS的Mapkit - 注解消失在地图上滚动/缩放

问题描述

在初始加载，注释显示就好了。但是，如果我滚动地图，它们都将消失，code仅要求用户位置，而不是在viewForAnnotation委托方法的其他注释。

剧情销

   - （无效）viewDidLoad中{
     ......从网络下载坐标和数据在这里...
     [self.mapView addAnnotation：密码];
}
 

委托方法

   - （MKAnnotationView *）的MapView：（*的MKMapView）的MapView viewForAnnotation：（ID＆LT; MKAnnotation＆GT;）注释
{
    //播放器的引脚
    如果（[注解类] == MKUserLocation.class）{
        回零;
    }    //集群针
    如果（[注解isKindOfClass：[REVClusterPin类]）{
        REVClusterPin *销=（REVClusterPin *）注释;
        如果（[销nodeCount]＆0）{
            pin.title = @___;            MKAnnotationView * annotationView =（REVClusterAnnotationView *）[图形页面dequeueReusableAnnotationViewWithIdentifier：@集群];            如果（！annotationView）{
                annotationView =（REVClusterAnnotationView *）
                [REVClusterAnnotationView页头] initWithAnnotation：注释reuseIdentifier：@集群];
            }            annotationView.image = [UIImage的imageNamed：@cluster.png];            [（REVClusterAnnotationView *）annotationView setClusterText：
             [的NSString stringWithFormat：@％i的，[针nodeCount]]];            annotationView.canShowCallout = NO;
            返回annotationView;
        }
    }
    //播放器引脚
    如果（[注解isKindOfClass：[ZEPointAnnotation类]）{
        ZEPointAnnotation *销=（ZEPointAnnotation *）注释;
        MKAnnotationView * annotationView = [图形页面dequeueReusableAnnotationViewWithIdentifier：@针];
        如果（！annotationView）{
            annotationView = [[MKAnnotationView页头] initWithAnnotation：注释reuseIdentifier：@针];
        }
        annotationView.canShowCallout = YES;
        annotationView.draggable = NO;        ...创建PIN数据在这里...        返回annotationView;
    }
    回零;
}
 

解决方案

删除动画。这将解决您的问题。

On initial load, the annotations show just fine. But if I scroll the map, they all disappear and the code is only called for the user location, not the other annotations in the viewForAnnotation delegate method.

Plot Pins

-(void)viewDidLoad{
     ...Download Coordinates and Data from Web here...
     [self.mapView addAnnotation:pin];
}

Delegate Method

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
    //Player's Pin
    if([annotation class] == MKUserLocation.class) {
        return nil;
    }

    //Cluster Pin
    if([annotation isKindOfClass:[REVClusterPin class]]){
        REVClusterPin *pin = (REVClusterPin *)annotation;
        if( [pin nodeCount] > 0 ){
            pin.title = @"___";

            MKAnnotationView *annotationView  = (REVClusterAnnotationView*)[mapView dequeueReusableAnnotationViewWithIdentifier:@"cluster"];

            if( !annotationView ){
                annotationView = (REVClusterAnnotationView*)
                [[REVClusterAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"cluster"];
            }

            annotationView.image = [UIImage imageNamed:@"cluster.png"];

            [(REVClusterAnnotationView*)annotationView setClusterText:
             [NSString stringWithFormat:@"%i",[pin nodeCount]]];

            annotationView.canShowCallout = NO;
            return annotationView;
        }
    }
    //Player Pin
    if([annotation isKindOfClass:[ZEPointAnnotation class]]){
        ZEPointAnnotation *pin = (ZEPointAnnotation *)annotation;
        MKAnnotationView *annotationView = [mapView dequeueReusableAnnotationViewWithIdentifier:@"pin"];
        if(!annotationView){
            annotationView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"pin"];
        }
        annotationView.canShowCallout = YES;
        annotationView.draggable = NO;

        ...Create Pin Data Here...

        return annotationView;
    }
    return nil;
}

解决方案

remove animations. that will solve your problem

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