iOS Swift3 TextView line at wrong position

Question

I have a textView which i use as an input field for chatMessages. I want it to expand if there is more text than could fit in one row.

func textViewDidChange(_ textView: UITextView) {
    self.textViewHeight.constant = textView.contentSize.height
}

I set a height constraint programmatically if the user enters something inside the textView.

<- For one liners it looks fine.

<- After you press enter it gets hidden.

<- The second enter shows it up again.

What am i doing wrong here? I try to recreate the look of whatsapp / imessage, where this hiding does not happen.

The Mach System · Accepted Answer · 2017-03-16 02:20:34Z

2

This is because you are changing the size in the wrong delegate function. The delegate textViewDidChange is called after you finished editing (resignFirstResponder gets called).

You should put your code to change the height in this function instead:

optional func textView(_ textView: UITextView, 
    shouldChangeTextIn range: NSRange, 
       replacementText text: String) -> Bool

So this will change the height of the UITextView as you type not after you finished typing.

answered Mar 16, 2017 at 2:20

The Mach System

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2 Comments

Jochen Österreicher Over a year ago

This works fine except for pressing return, where it still gets hidden. It looks like one line breakage is not recognized. Do you know a way to fix this too?

The Mach System Over a year ago

Can you try putting some margins like self.textViewHeight.constant = textView.contentSize.height + 10

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