IOS uitextview Adaptive Height uitextcontainerview jitter problem

When creating a comment input box similar to a friend's circle, you need to dynamically adjust the height of the input box,

However, after adjusting the height of the Uitextview, the continuation of the input will cause the content (text in the Uitextcontainerview) to wobble.

The scrollrangetovisible method solves my Problem (Swift 3):

Textview.scrollrangetovisible (Nsrange.init (location:0, length:0))

　　

How to get the text height and number of lines in Uitextview (Swift 3):

Let height = textview.sizethatfits (cgsize.init (width:textView.frame.size.width, Height: cgfloat.greatestfinitemagnitude). Heightlet line = Int (height/(Textview.font?). lineheight)!)

　　

Reprint Please specify source:http://www.cnblogs.com/ficow/p/7225465.html

IOS uitextview Adaptive Height uitextcontainerview jitter problem