CODEWITHSUNDEEP
swiftanimatewithduration
Adam Johnson
Adam Johnson

Reputation: 673

animateWithDuration in Swift - Could not find member 'CurveEaseOut'

I get the following error when attempting to pass a variable in to my animation in Swift:

Could not find member 'CurveEaseOut'

My code seems fine if I type the degrees in manually:

UIView.animateWithDuration(2.0, delay: NSTimeInterval(0.0), options: .CurveEaseOut, animations: {
        self.arrowImage.transform = CGAffineTransformMakeRotation((180.0 * CGFloat(M_PI)) / 180.0)
    }, completion: nil)

But I have the issue if I attempt to use a variable:

var turn = Double()

turn = 180.0

UIView.animateWithDuration(2.0, delay: NSTimeInterval(0.0), options: .CurveEaseOut, animations: {
        self.arrowImage.transform = CGAffineTransformMakeRotation((turn * CGFloat(M_PI)) / turn)
    }, completion: nil)

Perhaps it's my use of Double()? I've tried various different types and can't find a solution.

Upvotes: 1

Views: 1084

Answers (3)

Kelvin Lau
Kelvin Lau

Reputation: 6781

Problem is because you're using the variable turn. You're using turn inside a closure and you must use self.turn because turn is declared outside the scope of the animation closure.

Weird but that's how it is :\

Upvotes: 0

Christos Chadjikyriacou
Christos Chadjikyriacou

Reputation: 3759

There is nothing wrong with .CurveEaseOut. The problem i think is within the closure.

Try this 

var turn:CGFloat = 180.0

If the error remains then arrowImage is optional and you have to use if let to unwrapped it

UIView.animateWithDuration(2.0, delay: NSTimeInterval(0.0), options: .CurveEaseOut, animations: {
        if let ai = self.arrowImage {
             ai.transform = CGAffineTransformMakeRotation((turn * CGFloat(M_PI)) / turn)
       }
    }, completion: nil)

Upvotes: 1

aahrens
aahrens

Reputation: 5590

You could do two things. You could either

let turn: CGFloat = 180.0

or

CGAffineTransformMakeRotation((CGFloat(turn) * CGFloat(M_PI)) / CGFloat(turn))

Since Swift is type safe it's expecting a CGFloat passed to CGAffineTransformMakeRotation

Upvotes: 1

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