如何获得CALayer内部点的绝对位置

Question

如何获得CGay在CALayer中的绝对位置。 我需要这个来精确绘制像素

编辑：绝对到屏幕

Answer 1

递归地测试超级层，直到您到达根层：

CGPoint originalPoint = // wherever from you obtain your original point
CALayer *layer = self;
CGPoint point = originalPoint;
while (layer.superlayer)
{
    point = [layer convertPoint:point toLayer:layer.superlayer];
    layer = layer.superlayer;
}

// here `point' will contain the exact position