annotationView didChangeDragState被多次触发

我在IOS4 mapkit中有一个可拖动的注释，我试图在注释被拖动到一个新的位置时调用一个事件。annotationView didChangeDragState被多次触发

我的代码目前的样子：

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)annotationView 
    didChangeDragState:(MKAnnotationViewDragState)newState fromOldState:(MKAnnotationViewDragState)oldState 
{ 
    if (newState == MKAnnotationViewDragStateEnding) 
    { 
     CLLocationCoordinate2D droppedAt = annotationView.annotation.coordinate; 
     NSLog(@"dropped at %f,%f", droppedAt.latitude, droppedAt.longitude); 

     //update the annotation 
     //see if its an information annotation 
     if ([annotationView.annotation isKindOfClass:[InfoAnnotation class]]) { 
      NSLog(@"Info annotation updating.."); 
      InfoAnnotation* userAnnotation = ((InfoAnnotation *)annotationView.annotation); 
      [userAnnotation updateLocationWithServerForConvoy: self.title]; 
     } 

    } 
}

代码只需登录更新，然后告诉标注其更新发送到我的服务器，这是一个自定义的方法。

这种方法似乎越来越开除多次，在这里看到的日志：

2011-06-15 01:12:39.347 Convoy[1699:207] dropped at 37.340206,-122.027550 
2011-06-15 01:12:39.347 Convoy[1699:207] Info annotation updating.. 
2011-06-15 01:12:39.658 Convoy[1699:207] dropped at 37.340206,-122.027550 
2011-06-15 01:12:39.659 Convoy[1699:207] Info annotation updating.. 
2011-06-15 01:12:39.957 Convoy[1699:207] dropped at 37.340206,-122.027550 
2011-06-15 01:12:39.958 Convoy[1699:207] Info annotation updating.. 


2011-06-15 01:12:43.415 Convoy[1699:207] dropped at 37.339251,-122.026691 
2011-06-15 01:12:43.416 Convoy[1699:207] Info annotation updating.. 
2011-06-15 01:12:43.713 Convoy[1699:207] dropped at 37.339251,-122.026691 
2011-06-15 01:12:43.713 Convoy[1699:207] Info annotation updating.. 
2011-06-15 01:12:44.006 Convoy[1699:207] dropped at 37.339251,-122.026691 
2011-06-15 01:12:44.006 Convoy[1699:207] Info annotation updating.. 
2011-06-15 01:12:44.297 Convoy[1699:207] dropped at 37.339251,-122.026691 
2011-06-15 01:12:44.297 Convoy[1699:207] Info annotation updating.. 


2011-06-15 01:12:54.825 Convoy[1699:207] dropped at 37.337135,-122.025833 
2011-06-15 01:12:54.825 Convoy[1699:207] Info annotation updating.. 
2011-06-15 01:12:55.150 Convoy[1699:207] dropped at 37.337135,-122.025833 
2011-06-15 01:12:55.150 Convoy[1699:207] Info annotation updating.. 
2011-06-15 01:12:55.475 Convoy[1699:207] dropped at 37.337135,-122.025833 
2011-06-15 01:12:55.476 Convoy[1699:207] Info annotation updating.. 
2011-06-15 01:12:55.771 Convoy[1699:207] dropped at 37.337135,-122.025833 
2011-06-15 01:12:55.772 Convoy[1699:207] Info annotation updating.. 
2011-06-15 01:12:56.070 Convoy[1699:207] dropped at 37.337135,-122.025833 
2011-06-15 01:12:56.070 Convoy[1699:207] Info annotation updating..

每次我将它拖到（即空白），它似乎加1的时候，它就是所谓的量。任何人都可以给我任何想法可能造成这种情况？

来源

2011-06-14 RodH257

看起来我们是唯一的人这个问题。我的行为和你描述的完全一样。我注意到，当拖动的注释是MKPinAnnotationView时，它工作正常，但如果您的注释是MKAnnotationView，则会出现问题。看起来非常像ios中的错误。我会在苹果公司开一个。也许你会想这样做，以获得更多的压力？ – 2011-06-30 11:15:57

这看起来很奇怪。你有没有想过简单地连接你的注解的setCoordinate方法呢？只要通过拖动移动MKMapAnnotation，MapKit就会调用一次。

来源

2011-07-14 18:40:21 shawkinaw

如果有人还是想知道 - 你必须在MKAnnotationView拖动状态设置为 MKAnnotationViewDragStateNone。

因此，代码是：

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)annotationView didChangeDragState:(MKAnnotationViewDragState)newState fromOldState:(MKAnnotationViewDragState)oldState 
{ 
    if (newState == MKAnnotationViewDragStateEnding) 
    { 
    /* ... */ 
    [annotationView setDragState:MKAnnotationViewDragStateNone]; 
    // If you are animating - move the above into the completion block 
    } 
}

来源

2013-05-29 00:31:55 avioli

你救了我的生活:) – 2013-10-28 18:59:32

这真棒avioli，工作很棒！ – rilar 2014-09-03 11:45:20

annotationView didChangeDragState被多次触发

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