ios - 如何检测物理 body 区域的触摸？

Question

我确实使用此代码创建了 SKSpriteNode，并且物理主体是圆形。我如何检查用户是否触摸了物理主体中的耳朵？

self = [super initWithColor:[SKColor clearColor] size:CGSizeMake(200, 200)];
//...
self.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:self.size.width/2.0f];
self.userInteractionEnabled = YES;

Answer 1

我确实使用这段代码找到了解决问题的方法:

CGMutablePathRef pathRef;
// Fill pathRef with points and create phisycs body using pathRef.

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    CGPoint touchLocation = [touch locationInNode:self.scene];

    if (CGPathContainsPoint(pathRef, nil, touchLocation, NO)) {
        // If we are here it means user did touche physic body.
    }
}