防止MKPolygon有結

Question

我正在開發一個應用程序，其中用戶可以繪製一個多邊形區域的地圖。

我的問題是什麼可以繪製多邊形結（見圖片）（我不知道是否結是正確的詞）。我沒有找到防止多邊形打結的簡單方法。 對於附加圖像的情況，我想要去掉小卷曲，甚至要平滑輪廓

你知道一種方法嗎？

繪製多邊形當用戶觸摸屏幕的方法，確實使用MKPolyline，MKPolygon和MKOverlay如下：

- (void)touchesBegan:(UITouch*)touch 
{ 
    CGPoint location = [touch locationInView:self.mapView]; 
    CLLocationCoordinate2D coordinate = [self.mapView convertPoint:location toCoordinateFromView:self.mapView]; 
    [self.coordinates addObject:[NSValue valueWithMKCoordinate:coordinate]]; 
} 

- (void)touchesMoved:(UITouch*)touch 
{ 
    CGPoint location = [touch locationInView:self.mapView]; 
    CLLocationCoordinate2D coordinate = [self.mapView convertPoint:location toCoordinateFromView:self.mapView]; 
    [self.coordinates addObject:[NSValue valueWithMKCoordinate:coordinate]]; 
} 

- (void)touchesEnded:(UITouch*)touch 
{ 
    CGPoint location = [touch locationInView:self.mapView]; 
    CLLocationCoordinate2D coordinate = [self.mapView convertPoint:location toCoordinateFromView:self.mapView]; 
    [self.coordinates addObject:[NSValue valueWithMKCoordinate:coordinate]]; 
    [self didTouchUpInsideDrawButton:nil]; 
} 

- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay 
{ 
    MKOverlayPathView *overlayPathView; 

    if ([overlay isKindOfClass:[MKPolygon class]]) 
    { 
     // create a polygonView using polygon_overlay object 
     overlayPathView = [[MKPolygonView alloc] initWithPolygon:overlay]; 
     overlayPathView.fillColor = [UIColor redColor]; 
     overlayPathView.lineWidth = 1.5; 
     return overlayPathView; 
    } 
    else if ([overlay isKindOfClass:[MKPolyline class]]) 
    { 
     overlayPathView = [[MKPolylineView alloc] initWithPolyline:(MKPolyline *)overlay]; 
     overlayPathView.fillColor = [UIColor redColor]; 
     overlayPathView.lineWidth = 3; 
     return overlayPathView; 
    } 
    return nil; 
} 

Answer 1

1. MKOverlayPathView爲deprecated以來的iOS 7.0。您將使用MKOverlayRenderer而不是它以及相關的地圖委託方法。
2. 嘗試玩MKOverlayRenderer的miterLimit屬性。

例子：

-(MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay { 
    if ([overlay isKindOfClass:[MKPolygon class]]) { 
     MKPolygonRenderer *polygonRenederer = [[MKPolygonRenderer alloc] initWithPolygon:overlay]; 
     polygonRenederer.fillColor = [UIColor redColor]; 
     polygonRenederer.lineWidth = 1.5; 
     polygonRenederer.miterLimit = 10; 
     return polygonRenederer; 
    } else if ([overlay isKindOfClass:[MKPolyline class]]) { 
     MKPolylineRenderer *lineRenderer = [[MKPolylineRenderer alloc] initWithPolyline:overlay]; 
     lineRenderer.strokeColor = [UIColor redColor]; 
     lineRenderer.lineWidth = 3; 
     return lineRenderer; 
    } 
    return nil; 
}