如何獲得CALayer內部點的絕對位置

Question

如何獲得CGay在CALayer中的絕對位置。 我需要這個來精確繪制像素

編輯：絕對到屏幕

Answer 1

遞歸地測試超級層，直到您到達根層：

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