ios - Can't invoke 'animationWithDuration' error message for a simple fade out on UILabel in swift -


i'm trying make simple fade in-out animation on uilabel in swift 'can't invoke...' error message.

@iboutlet weak var sendbuttonlabel: uilabel?  uiview.animatewithduration(1.5, animations: {             self.sendbuttonlabel?.alpha = 1.0         })

enter image description here

thanks in advance :)

try this:

uiview.animatewithduration(1.5, animations: {             self.sendbuttonlabel?.alpha = 1             }, completion: nil)

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