Apple is an American multinational corporation headquartered in Cupertino, California that designs, develops, and sells consumer electronics, computer software, and personal computers.

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In iOS, y-axis starts from the top and grows downward. It is the opposite to OSX. What is the rationale and technical advantage behind this change?

In iOS, the coordinate (0, 0) means the top left corner. In OSX it is the bottom left corner. What is the Apple's rationale or technical advantage of this coordinate system?