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Swift 3中“M_PI_4”和“M_PI_2”的语法是什么?

[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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