我已经在地图中渲染了近 1000 个多边形。我得到多边形的路径使用
- (CGPathRef)polyPath:(MKPolygon *)polygon
{
MKMapPoint *points = [polygon points];
NSUInteger pointCount = [polygon pointCount];
NSUInteger i;
if (pointCount < 3)
return NULL;
CGMutablePathRef path = CGPathCreateMutable();
if([polygon isKindOfClass:[MKPolygon class]])
{
for (MKPolygon *interiorPolygon in polygon.interiorPolygons)
{
CGPathRef interiorPath = [self polyPath:interiorPolygon];
CGPathAddPath(path, NULL, interiorPath);
CGPathRelease(interiorPath);
}
}
CGPoint relativePoint = [self pointForMapPoint:points[0]];
CGPathMoveToPoint(path, NULL, relativePoint.x, relativePoint.y);
for (i = 1; i < pointCount; i++)
{
relativePoint = [self pointForMapPoint:points[i]];
CGPathAddLineToPoint(path, NULL, relativePoint.x, relativePoint.y);
}
return path;
}
- (void)drawMapRect:(MKMapRect)mapRect
zoomScale:(MKZoomScale)zoomScale
inContext:(CGContextRef)context
{
MultiPolygon *multiPolygon = (MultiPolygon *)self.overlay;
for (MKPolygon *polygon in multiPolygon.polygons)
{
if([polygon isKindOfClass:[MKPolygon class]])
{
CGPathRef path = [self polyPath:polygon];
if (path)
{
[self applyFillPropertiesToContext:context atZoomScale:zoomScale];
CGContextBeginPath(context);
CGContextAddPath(context, path);
CGContextDrawPath(context, kCGPathEOFill);
[self applyStrokePropertiesToContext:context atZoomScale:zoomScale];
CGContextBeginPath(context);
CGContextAddPath(context, path);
CGContextSetAlpha(context,1.0);
CGContextStrokePath(context);
}
CGPathRelease(path);
}
}
}
我漏水了
CGPathRelease(interiorPath);
和
return path;
我知道我必须使用 CGPathRelease 释放路径,但是当我必须返回时在哪里释放它。
两者都泄漏了巨大的内存。我已经为此工作了几天,请帮助。
提前致谢