MKOverlay有時消失

我在我的映射表疊加選項：一個MKCircleOverlay和MKPolygonOverlay.The第一是可變半徑，通過UISlider.The最後控制是根據定製我非常改變corners.If的數量和位置快速的圓的半徑（減少UISlider的值），有時我覆蓋消失（圓圈），之後的多邊形不能再被繪製（當然圓太）。沒有崩潰的app.What的會是什麼？MKOverlay有時消失

下面是一些代碼，我用：

- (IBAction) addCircle:(id)sender 
{ 
slider.hidden = NO; 
slider.transform = CGAffineTransformMakeRotation(M_PI*(-0.5)); 

_longPressRecognizer= [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)]; 
_longPressRecognizer.minimumPressDuration = 1.0; 

[mapview addGestureRecognizer:_longPressRecognizer]; 
[_longPressRecognizer release]; 
} 

- (void)handleLongPress:(UIGestureRecognizer *)gestureRecognizer 
{ 
if (gestureRecognizer.state != UIGestureRecognizerStateBegan) 
    return; 
CGPoint touchPoint = [gestureRecognizer locationInView:mapview];  
CLLocationCoordinate2D touchMapCoordinate = [mapview convertPoint:touchPoint toCoordinateFromView:mapview]; 

MKPointAnnotation *pa = [[MKPointAnnotation alloc] init]; 
pa.coordinate = touchMapCoordinate; 
pa.title = @"Circle Based Search"; 

[mapview addAnnotation:pa]; 
[pa release]; 

tmC = touchMapCoordinate; 
double radius = 1000.0; 

self.circleOverlay = [MKCircle circleWithCenterCoordinate:tmC radius:radius]; 
[mapview removeOverlays:[mapview overlays]]; 
[mapview addOverlay:circleOverlay]; 
[mapview removeAnnotations:[mapview annotations]]; 
} 


-(MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id)overlay 
{ 
if ([overlay isKindOfClass:[MKCircle class]]) 
{ 
    MKCircleView* circleView = [[MKCircleView alloc] initWithOverlay:overlay] ; 
    circleView.fillColor = [UIColor blueColor]; 
    circleView.strokeColor = [UIColor blueColor]; 
    circleView.lineWidth = 5.0; 
    circleView.alpha = 0.20; 
     return circleView; 
} 
else 
    if ([overlay isKindOfClass:[MKPolygon class]]) 
{ 
    MKPolygonView *polygonView = [[MKPolygonView alloc] initWithOverlay:overlay ]; 
    polygonView.fillColor = [UIColor blueColor]; 
    polygonView.strokeColor = [UIColor blueColor]; 
    polygonView.lineWidth = 5.0; 
    polygonView.alpha = 0.20; 
    return polygonView; 
} 
return [kml viewForOverlay:overlay]; 
} 

- (void)addCircleWithRadius:(double)radius 
{ 
self.circleOverlay = [MKCircle circleWithCenterCoordinate:tmC radius:radius]; 
[mapview removeOverlays:[mapview overlays]]; 
[mapview addOverlay:circleOverlay]; 
[mapview removeAnnotations:[mapview annotations]]; 
} 

- (IBAction)sliderChanged:(UISlider *)sender 
{ 
    double radius = (sender.value); 
[self addCircleWithRadius:radius]; 
[mapview removeAnnotations:[mapview annotations]]; 
}

來源

2012-04-05 Hari

請告訴我們您所使用的調整圈子中的代碼。直到我們看到我們只能猜測可能發生的事情。 – sosborn 2012-04-06 05:15:20

剛剛完成，對不起，我完全忘了添加代碼。 – Hari 2012-04-06 13:08:42

你應該NSLog半徑在你的sliderChanged看看它是否正在返回你所期望的。同時記錄tmc值以確保中心保持在您期望的位置。不確定代碼結構，但是當您緩慢移動滑塊時，您可能正在激活長觸摸識別器。 – sosborn 2012-04-06 13:43:10

問題solved.It是一些與UISlider，在筆尖，在滑塊的檢查Values下的財產Continuous是checked.After我未選中的是，問題解決了。

來源

2012-04-11 13:28:07 Hari

MKOverlay有時消失

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