ios - Declaring float value -

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i'm trying set float value variable code below, xcode won't let me go on.

import spritekit  class gamescene: skscene {      let framewidth = cgfloat(self.frame.width) } 

it keeps returning me this:

value of type 'nsobject -> () -> gamescene' has no member 'frame'

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i looked error everywhere, nothing helped me. know can make work?

thanks in advance,
luiz.