ios - Best way to animate scaling and sizing of buttons in Swift? -

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i'm using code below animate intro-animation buttons in ios swift game. code inside of update function , same lot of buttons.

    if self.creditsbutton.size.width < 40 {         self.creditsbutton.size.width += 1         self.creditsbutton.size.height += 1     }

my question is; there better (more clean) way animate scaling/sizes of buttons/menu's?

if button subclass of skspritenode skaction enables schedule animation without needing regularly update, e.g. (apologies objective-c):

skaction *scale = [skaction resizetowidth:40.0 duration:0.4]; [spritenode runaction:scale];

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