如何转换Cocoa协调从左上角==原点到左下角==原点 [英] How do I convert Cocoa co-ords from top left == origin to bottom left == origin

问题描述

我使用CGWindowListCopyWindowInfo获取所有窗口的列表。

I use CGWindowListCopyWindowInfo to get a list of all windows. It gives me the co-ordinates of each window based upon the origin being the top-left of the screen.

如果我使用NSWindow的setFrame，它会给出每个窗口的坐标，其基础是屏幕的左上角方法，坐标基于原点是屏幕的左下角。

If I use NSWindow's setFrame method, the co-ordinates on based upon the origin being the bottom-left of the screen.

什么是干净，可靠的方式转换从一个到另一个？

What's a clean, reliable way to convert from one to the other?

添加：通过干净可靠，我的意思是，无论用户是否有多个屏幕或正在使用空间，一定要工作。

Added: By clean and reliable, I mean, something sure to work regardless whether the user has multiple screens or is using Spaces. I figure there must be a known idiom using library APIs.

推荐答案

数学是相当可靠的： - ）

Math is quite reliable :-)

yFromBottom = screenHeight - windowHeight - yFromTop

$ b b

主屏幕高度为

Main screen height is

[[[NSScreen screens] objectAtIndex:0] frame].size.height

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