viewForOverlay從未被稱爲

我有段的按鈕視圖。點擊索引爲「1」的按鈕時，它應該顯示帶有一些疊加層的mapview。出於這個原因，我有以下代碼：viewForOverlay從未被稱爲

{ 
     [_routeMap setHidden:NO]; 
     [self drawTheMap]; 
     [_routeMap setRegion:_region animated:YES]; 
     [_routeMap regionThatFits:_region]; 
     [_navBar setHidden:NO]; 
     NSLog(@"overlays: %@", _routeMap.overlays); 
    } 
    -(void)drawTheMap 
    { 
     [_routeMap setFrame:CGRectMake(0, 44, 320, 416)]; 
     for (int i=0; i<[_arrayOfPoints count]; i++) { 
      CLLocation* location = [[CLLocation alloc] initWithLatitude:[[_arrayOfPoints objectAtIndex:i] latitude] 
                  longitude:[[_arrayOfPoints objectAtIndex:i] longitude]]; 

    ... 
     MKCircle * dot = [MKCircle circleWithCenterCoordinate:location.coordinate radius:radius]; 
      [_routeMap addOverlay:dot]; 

    ... 
    } 
    ... 
    } 
    - (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay 
{ 
    MKCircleView *circleView = [[MKCircleView alloc] initWithCircle:overlay]; 
    circleView.lineWidth = 1.0; 
    circleView.strokeColor = [UIColor orangeColor]; 
    [circleView setFillColor:[UIColor orangeColor]]; 

    return [circleView autorelease]; 
}

但viewForOverlay方法不會被調用=（的NSLog表明我的MKMapView包含一些覆蓋任何人可以幫助我

來源

2011-09-19 Vov4yk

是否設置了地圖視圖的委託屬性？另外，在調用addOverlay時，記錄座標和半徑值。 – Anna

在方法？ -(void)drawTheMap，而不是[_routeMap addOverlay:dot];嘗試[self addOverlay:dot];

來源

2011-09-19 15:53:12

viewForOverlay從未被稱爲

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