annotationView didChangeDragState被多次觸發

我在IOS4 mapkit中有一個可拖動的註釋，我試圖在註釋被拖動到一個新的位置時調用一個事件。annotationView didChangeDragState被多次觸發

我的代碼目前的樣子：

- (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]; 
     } 

    } 
}

代碼只需登錄更新，然後告訴標註其更新發送到我的服務器，這是一個自定義的方法。

這種方法似乎越來越開除多次，在這裏看到的日誌：

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..

每次我將它拖到（即空白），它似乎加1的時候，它就是所謂的量。任何人都可以給我任何想法可能造成這種情況？

來源

2011-06-14 RodH257

看起來我們是唯一的人這個問題。我的行爲和你描述的完全一樣。我注意到，當拖動的註釋是MKPinAnnotationView時，它工作正常，但如果您的註釋是MKAnnotationView，則會出現問題。看起來非常像ios中的錯誤。我會在蘋果公司開一個。也許你會想這樣做，以獲得更多的壓力？ – 2011-06-30 11:15:57

這看起來很奇怪。你有沒有想過簡單地連接你的註解的setCoordinate方法呢？只要通過拖動移動MKMapAnnotation，MapKit就會調用一次。

來源

2011-07-14 18:40:21 shawkinaw

如果有人還是想知道 - 你必須在MKAnnotationView拖動狀態設置爲 MKAnnotationViewDragStateNone。

因此，代碼是：

- (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 
    } 
}

來源

2013-05-29 00:31:55 avioli

你救了我的生活:) – 2013-10-28 18:59:32

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

annotationView didChangeDragState被多次觸發

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