[英]What is the syntax for “ M_PI_4” and “M_PI_2” in Swift 3?
I know M_PI
is now CGFloat.pi
but am not sure what M_PI_4
would be. 我知道M_PI
现在是CGFloat.pi
但我不确定M_PI_4
是什么。 I tried CGFloat.pi*4
but that wasn't correct. 我试过CGFloat.pi*4
但这不正确。
Swift 3.1: M_PI_4
现在是.pi / 4
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