CGPathContainsPoint在iOS 12中损坏了吗？有解决方法吗？

Question

我会尽量简短。

接受以下测试代码：

CGPath* path =  CGPathCreateMutable();
CGPathMoveToPoint(path, nil, 318.43, 183.47);
CGPathAddCurveToPoint(path, nil, 322.98, 189.32, 327, 194.93, 329.81, 201.62);
CGPathAddLineToPoint(path, nil, 339.36, 182.58);
CGPathCloseSubpath(path);
CGPathMoveToPoint(path, nil, 327.8, 193.04);
CGPathAddCurveToPoint(path, nil, 323.06, 193.04, 323.06, 185.5, 327.8, 185.5);
CGPathAddCurveToPoint(path, nil, 332.54, 185.5, 332.54, 193.04, 327.8, 193.04);
CGPathCloseSubpath(path);
CGRect boundingBox = CGPathGetBoundingBox(path);

CGPoint testPoint = CGPointMake(200,185);

NSLog(@"path contains point=%d | bounding box contains point=%d",CGPathContainsPoint(path, nil,  testPoint, NO), CGRectContainsPoint(boundingBox, testPoint) );

此代码在iOS 10上正确返回：

  

路径包含点= 0 |边界框包含point = 0

iOS 12上的相同代码返回：

  

路径包含point = 1 |边界框包含point = 0

如您所见，在iOS 12上CGPathContainsPoint表示我的testPoint在该形状内，即使该形状的边界框没有显示。

在CGPathContainsPoint中将填充规则更改为NO不会更改任何内容。

有解决方案吗？ 我之前尝试过苹果论坛，但似乎没人回答。

谢谢您的帮助！

Answer 1

在与iOS 10.3和12.1相同的模拟器上确认了此问题

我不明白为什么会这样，唯一的线索是如果我们删除此行，问题就会消失

CGPathMoveToPoint(path, nil, 327.8, 193.04);
CGPathAddCurveToPoint(path, nil, 323.06, 193.04, 323.06, 185.5, 327.8, 185.5);
CGPathAddCurveToPoint(path, nil, 332.54, 185.5, 332.54, 193.04, 327.8, 193.04);
CGPathCloseSubpath(path);

这可能是由于填充规则或其他原因（例如，由于路径重叠）引起的，无论如何，解决方法是创建单独的路径，然后按如下方式合并其边界框（添加了一些绘图代码以使事物可视化）

- (void)drawRect:(CGRect)rect
{
    CGContextRef context = UIGraphicsGetCurrentContext();

    CGPoint testPoint = CGPointMake(200,185);
    [[UIColor blueColor] setStroke];
    CGContextStrokeEllipseInRect(context, CGRectMake(testPoint.x - 5, testPoint.y - 5, 10, 10));

    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path, nil, 318.43, 183.47);
    CGPathAddCurveToPoint(path, nil, 322.98, 189.32, 327, 194.93, 329.81, 201.62);
    CGPathAddLineToPoint(path, nil, 339.36, 182.58);

    CGRect box1 = CGPathGetBoundingBox(path);

    NSLog(@"path 1 contains point=%d | bounding box contains point=%d", CGPathContainsPoint(path, nil,  testPoint, NO), CGRectContainsPoint(box1, testPoint));

    [[UIColor grayColor] setFill];
    [[UIColor redColor] setStroke];
    CGContextAddPath(context, path);
    CGContextClosePath(context);
    CGContextDrawPath(context, kCGPathFillStroke);
    CGPathRelease(path);

    path = CGPathCreateMutable();
    CGPathMoveToPoint(path, nil, 327.8, 193.04);
    CGPathAddCurveToPoint(path, nil, 323.06, 193.04, 323.06, 185.5, 327.8, 185.5);
    CGPathAddCurveToPoint(path, nil, 332.54, 185.5, 332.54, 193.04, 327.8, 193.04);

    CGRect box2 = CGPathGetBoundingBox(path);

    NSLog(@"path 2 contains point=%d | bounding box contains point=%d", CGPathContainsPoint(path, nil,  testPoint, NO), CGRectContainsPoint(box2, testPoint));

    [[UIColor yellowColor] setFill];
    [[UIColor greenColor] setStroke];
    CGContextAddPath(context, path);
    CGContextClosePath(context);
    CGContextDrawPath(context, kCGPathFillStroke);
    CGPathRelease(path);

    CGRect boundingBox = CGRectUnion(box1, box2);
    [[UIColor magentaColor] setStroke];
    CGContextStrokeRect(context, boundingBox);

    NSLog(@"bounding box contains point=%d", CGRectContainsPoint(boundingBox, testPoint));
}

Answer 2

我看到了您描述的相同行为。有趣的是，如果您手动关闭路径，它似乎可以工作。例如，除了添加带有注释的行之外，这与您的路径相同：

CGMutablePathRef path = CGPathCreateMutable();
CGPathMoveToPoint(path, nil, 318.43, 183.47);
CGPathAddCurveToPoint(path, nil, 322.98, 189.32, 327, 194.93, 329.81, 201.62);
CGPathAddLineToPoint(path, nil, 339.36, 182.58);
CGPathAddLineToPoint(path, nil, 318.43, 183.47);  // manually add line back to starting point
CGPathCloseSubpath(path);

CGPathMoveToPoint(path, nil, 327.8, 193.04);
CGPathAddCurveToPoint(path, nil, 323.06, 193.04, 323.06, 185.5, 327.8, 185.5);
CGPathAddCurveToPoint(path, nil, 332.54, 185.5, 332.54, 193.04, 327.8, 193.04);
CGPathCloseSubpath(path);

我可能建议尝试自己跟踪起点，并在关闭子路径的任何地方添加一条回线，看看是否能解决该问题。

---

更莫名其妙的是，两次CGPathMoveToPoint（大声笑）似乎也可以解决。

CGMutablePathRef path = CGPathCreateMutable();
CGPathMoveToPoint(path, nil, 318.43, 183.47);
CGPathMoveToPoint(path, nil, 318.43, 183.47);   // move the the starting point twice?!?
CGPathAddCurveToPoint(path, nil, 322.98, 189.32, 327, 194.93, 329.81, 201.62);
CGPathAddLineToPoint(path, nil, 339.36, 182.58);
CGPathCloseSubpath(path);

CGPathMoveToPoint(path, nil, 327.8, 193.04);
CGPathAddCurveToPoint(path, nil, 323.06, 193.04, 323.06, 185.5, 327.8, 185.5);
CGPathAddCurveToPoint(path, nil, 332.54, 185.5, 332.54, 193.04, 327.8, 193.04);
CGPathCloseSubpath(path);