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iOS Build an Interactive Story App with Swift 2 Adding Sound Effects Repositioning the Text Field

Reed Carson
Reed Carson
8,306 Points
Posted by Reed Carson
Reed Carson
8,306 Points

Duration Value in animateWithDuration Method is Irrelevant

UIView.animateWithDuration(0.8) { self.textFieldBottomConstrain.constant = keyboardFrame.size.height + 10

I noticed when we use this method that changing the value for duration has no effect on the show and hid animation. Even setting it to 5 seconds up from 0.8 makes no difference. Whats going on?

1 Answer

Martin Wildfeuer
PLUS
Martin Wildfeuer
Courses Plus Student 11,071 Points
Martin Wildfeuer
Martin Wildfeuer
Courses Plus Student 11,071 Points

You are right, animating constraints with the UIView animation methods does not work this way. Your constraint is not animated whatsoever. The following should work:

// Set the constant value *before* calling the animation method
self.textFieldBottomConstrain.constant = keyboardFrame.size.height + 10

UIView.animateWithDuration(0.8) {
   // Calling layoutIfNeeded on the view containing the view
   // you want to animate will trigger the animation
   self.view.layoutIfNeeded()
}

Useful links on that topic:

Hope that helps :)

P.S. Take care, getting the correct height of the keyboard is a tricky one! Let's google this, I am sure you will find some good explanations on it!

Reed Carson
Reed Carson
8,306 Points
Reed Carson
Reed Carson
8,306 Points

Cool thanks. This should be useful to know. Im wondering however why this way wasn't shown in the video instead? Or did I just mix it up.