MKMapView - 撫摸一條路徑

Question

我試圖爲一個MapView的覆蓋視圖添加筆觸和填充路徑。現在填充工程，筆畫不...從任何想法看下面的代碼？

- (void)drawMapRect:(MKMapRect)mapRect 
      zoomScale:(MKZoomScale)zoomScale 
      inContext:(CGContextRef)ctx 
{  
    CGContextSetRGBStrokeColor(ctx, 1.0, 0.0, 0.0, 0.8); 
    CGContextSetRGBFillColor(ctx, 0.0, 0.0, 0.8, 0.4); 

    CGContextSetLineCap(ctx, kCGLineCapRound); 
    CGContextSetLineWidth(ctx, 8.0); 

    CGPoint pt; 
    pt = [self pointForMapPoint:MKMapPointForCoordinate(CLLocationCoordinate2DMake(0, 0))]; 
    CGContextMoveToPoint(ctx, pt.x, pt.y); 

    pt = [self pointForMapPoint:MKMapPointForCoordinate(CLLocationCoordinate2DMake(-2, 3))]; 
    CGContextAddLineToPoint(ctx, pt.x, pt.y); 

    pt = [self pointForMapPoint:MKMapPointForCoordinate(CLLocationCoordinate2DMake(-2, 5))]; 
    CGContextAddLineToPoint(ctx, pt.x, pt.y); 

    pt = [self pointForMapPoint:MKMapPointForCoordinate(CLLocationCoordinate2DMake(-4, 4))]; 
    CGContextAddLineToPoint(ctx, pt.x, pt.y); 

    CGContextDrawPath(ctx, kCGPathFillStroke); 
} 

Answer 1

這使得工作...

CGContextSetLineWidth(ctx, 1 * MKRoadWidthAtZoomScale(zoomScale));