迅捷动画不起作用

Question

I am trying to move a UILabel and a UIButton onto the screen of my app once something happens, however, when I use an animation to do this, it doesn't work and when the animation is supposed to happen, the components don't move onto the screen. Here is the code for the animation:

UIView.animateWithDuration(2) { () -> Void in
                    self.label.center = CGPointMake(self.view.center.x, self.label.center.y)
                    self.again.center = CGPointMake(self.view.center.x, self.again.center.y)
                }

Any help with this problem will be greatly appreciated!

Answer 1

You should try this. Using layoutIfNeeded() will reposition everything.

UIView.animateWithDuration(2) { () -> Void in

                 self.label.center = CGPointMake(self.view.center.x, self.label.center.y)
                 self.again.center = CGPointMake(self.view.center.x, self.again.center.y)
                 self.view.layoutIfNeeded()
            }

Answer 2

Try this!

UIView.animateWithDuration(1.0,
delay: 2.0,
options: .CurveEaseInOut ,
animations: {
self.label.center = CGPointMake(self.view.center.x, self.label.center.y)
self.again.center = CGPointMake(self.view.center.x, self.again.center.y)    },
completion: { finished in
  println("Bug moved left!")
  self.faceBugRight()
})
}