如何检查触摸点是否在UIBezierPath（iOS）上 [英] How to check if touch point is on UIBezierPath (iOS)

问题描述

我怎么知道触摸点（touchesBegan）是否在隐藏的UIBezierPath上？

How could I know if a touch point (touchesBegan) is on a hidden UIBezierPath?

推荐答案

[bezierPath containsPoint:touchPoint];

只需确保您的触摸点与bezierPaths点位于同一坐标系中并确保点数在屏幕空间中都在相同的上下文中。

Just make sure that your touch point is in the same coordinate system as the bezierPaths points and that the points are within the same context i.e. both in screen space.

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    CGPoint touchPoint = [touch locationInView:self.view];
    if ([self.bezierPath containsPoint:touchPoint])
    {
        // do stuff
    }
}

另请注意：如果您在某些CoreGraphics绘图中使用UIBezierPath，则需要在touchPoint上翻转y轴，例如......

Also note: If you are using your UIBezierPath in some CoreGraphics drawing you will want to flip the y-axis on the touchPoint for example...

touchPoint.y = self.view.bounds.size.height - touchPoint.y;

touchPoint.y = self.view.bounds.size.height - touchPoint.y;

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