[英]How to get absolute position of point inside CALayer
how can I obtain the absolute position of a CGPoint inside a CALayer. 如何获得CGay在CALayer中的绝对位置。 I need this for exact pixel drawing
我需要这个来精确绘制像素
Edit: Absolute to the screen 编辑:绝对到屏幕
Hit test the superlayers recursively, until you arrive at the root layer: 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
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