Morphing effect isn't enabled when the label is added programmatically

[dodomarocgenex]

I can't see any morphing effect when there is no storyboard used

[mn288]

clear the text and input the message again programmatically

[dodomarocgenex]

It didn't work. I've done this:

textView.text = ""
textView.text = "Some New String"

Without any luck

[36bydesign]

I got a weirder result, where the morph finally happened, but in super slow-motion (i.e. 15 seconds to complete).