Exécution de segue après que l'animation prenne du temps

Question

J'essaie d'effectuer une séquence dans le bloc d'achèvement d'une animation dans Swift. Cependant, le segue prend beaucoup de temps (environ 10 secondes) à faire et je ne sais pas pourquoi. Voici le code:

override func viewDidAppear(animated: Bool) { 
     super.viewDidAppear(animated) 

     imageViewAnimated.startAnimating() 


     if label.center != CGPoint(x:50, y:10) { 

      UIView.animateWithDuration(2.0, delay: 0.0, usingSpringWithDamping: 0.0, initialSpringVelocity: 0.0, options: .CurveEaseOut, animations: {() -> Void in 
       self.label.center = self.view.center 

       }, completion: nil) 

      UIView.animateWithDuration(0.5, delay: 0.0, usingSpringWithDamping: 0.0, initialSpringVelocity: 0.0, options: .CurveEaseOut, animations: {() -> Void in 
       self.label.alpha = 0.0 

       }, completion: { finished in 

        self.poof.alpha = 1.0 
        self.performSegueWithIdentifier("backSegue", sender: nil) 
      }) 
     } 
    } 

Answer 1

override func viewDidAppear(animated: Bool) { 
      super.viewDidAppear(animated) 

      imageViewAnimated.startAnimating() 


      if label.center != CGPoint(x:50, y:10) { 

       UIView.animateWithDuration(2.0, delay: 0.0, usingSpringWithDamping: 0.0, initialSpringVelocity: 0.0, options: .CurveEaseOut, animations: {() -> Void in 
        self.label.center = self.view.center 

        }, completion: nil) 

       UIView.animateWithDuration(0.5, delay: 0.0, usingSpringWithDamping: 0.0, initialSpringVelocity: 0.0, options: .CurveEaseOut, animations: {() -> Void in 
        self.label.alpha = 0.0 

        }, completion: { finished in 

         self.poof.alpha = 1.0 
         dispatch_async(dispatch_get_main_queue(),{ 
          self.performSegueWithIdentifier("backSegue", sender: nil) 
         }) 
       }) 
      } 
     }