UIView Animation in Swift not working, wrong arguments error

问题

I'm trying to do an animation and used the below code. I'm getting "Cannot invoke 'animateWithDuration' with an argument list of type '(FloatLiteralConvertible, delay: FloatLiteralConvertible, options: UIViewAnimationOptions, animations: () -> () -> $T4, completion: (Bool) -> (Bool) -> $T5)'" Error.

This means I'm using wrong arguments. I could be wrong. Please help in this. I couldn't really resolve it.

var basketTopFrame = CGRect()
basketTopFrame = dropPlace.frame
var mytimer : NSTimer = NSTimer .scheduledTimerWithTimeInterval(2.0, target: self, selector: "restart", userInfo: nil, repeats: false)

UIView.animateWithDuration(1.0, delay: 0.1, options: UIViewAnimationOptions.CurveEaseIn , animations: {  var pickPlace = basketTopFrame }, completion:  {(finished: Bool) in mytimer })

Thanks in advance.

回答1:

Closures have auto return if there is only one statement. Due to that in your case it is returning NSTimer and not Void. Your provided closure doesn't match signature closure. You have to call method on myTimer, for example, to fix this issue:

UIView.animateWithDuration(1.0, delay: 0.1, options: UIViewAnimationOptions.CurveEaseIn,
    animations: {
        var pickPlace = basketTopFrame
    },
    completion:  { (finished: Bool) in
        mytimer.fire()
    }
)

来源：https://stackoverflow.com/questions/26397164/uiview-animation-in-swift-not-working-wrong-arguments-error