What is the syntax for “ M_PI_4” and “M_PI_2” in Swift 3?
Question
I know M_PI is now CGFloat.pi but am not sure what M_PI_4 would be. I tried CGFloat.pi*4 but that wasn't correct.
1 answers
solution1
8 ACCPTED 2017-06-08 00:52:52
Swift 3.1： M_PI_4现在是.pi / 4
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