標記不會在拖動時添加 - Google Maps iOS應用程序

Question

我正在開發iOS Google Map。除了當用戶拖動一個標記時，我有以下工作，標記不會在釋放後在那裏繪製。我在哪裏犯了一個錯誤？

- (void)clearAllOverlay 
{ 
[_mapView clear]; 
[self drawPolygon]; 
[self addMarker]; 
} 

- (void)addMarker 
{ 
CLLocationCoordinate2D position; 
for (int i = 0; i <= [tappedCoordinates count]-1; i++) { 
    position.latitude = [[[tappedCoordinates objectAtIndex:i] objectAtIndex:0] floatValue]; 
    position.longitude = [[[tappedCoordinates objectAtIndex:i] objectAtIndex:1] floatValue]; 
    GMSMarker *marker = [[GMSMarker alloc] init]; 
    marker.position = position; 
    marker.map = _mapView; 
    marker.icon = [GMSMarker markerImageWithColor:[UIColor blueColor]]; 
    [marker setDraggable: YES]; 
} 
} 
//runs everytime user taps on marker 
- (bool)mapView:(GMSMapView *)mapView didTapMarker:(GMSMarker *) marker 
{ 
[latitudeTappedCoordinates removeObject:[NSNumber numberWithFloat:marker.position.latitude]]; 
[longitudeTappedCoordinates removeObject:[NSNumber numberWithFloat:marker.position.longitude]]; 
[self clearAllOverlay]; 
return 0; 
} 
//called while marker is dragged 
- (void)mapView:(GMSMapView *)mapView didDragMarker:(GMSMarker *) marker 
{ 
[latitudeTappedCoordinates addObject:[NSNumber numberWithFloat:marker.position.latitude]]; 
[longitudeTappedCoordinates addObject:[NSNumber numberWithFloat:marker.position.longitude]]; 

[self clearAllOverlay]; 
} 
//runs everytime user taps on any coordinate, except marker 
- (void)mapView:(GMSMapView *)mapView didTapAtCoordinate:(CLLocationCoordinate2D)coordinate 
{ 
// store tapped coordinates in multi-dimensional array 
NSArray *array = @[[NSNumber numberWithFloat:coordinate.latitude], [NSNumber numberWithFloat:coordinate.longitude]]; 
[tappedCoordinates addObject:array]; 
[latitudeTappedCoordinates addObject:[NSNumber numberWithFloat:coordinate.latitude]]; 
[longitudeTappedCoordinates addObject:[NSNumber numberWithFloat:coordinate.longitude]]; 
[self clearAllOverlay]; 
} 

Answer 1

試試這個：

- (void) mapView:(GMSMapView *) mapViewdidEndDraggingMarker:(GMSMarker *) marker { 
    // store tapped coordinates in multi-dimensional array 
    NSArray *array = @[[NSNumber numberWithFloat:marker.position.latitude], [NSNumber numberWithFloat:marker.position.longitude]]; 
    [tappedCoordinates addObject:array]; 
    [latitudeTappedCoordinates addObject:[NSNumber numberWithFloat:marker.position.latitude]]; 
    [longitudeTappedCoordinates addObject:[NSNumber numberWithFloat:marker.position.longitude]]; 
    [self clearAllOverlay]; 

}