UITextView Changing Size Dynamically - ios

Question

I am using the following code to dynamically adjust the height of the containerView which contains my UITextView
func textViewDidChange(textView: UITextView) {
let amountOfLinesToBeShown:CGFloat = 6
let maxHeight:CGFloat = textView.font!.lineHeight * amountOfLinesToBeShown
if ((textView.contentSize.height / textView.font!.lineHeight) < 6) {
topConstraint?.constant = -textView.sizeThatFits(CGSizeMake(textView.frame.size.width, maxHeight)).height - keyboardFrameSize!.height
containerView.layoutIfNeeded()
containerView.updateConstraints()
}
}
The problem is, when I am typing, it appears like this:
and the desired effect is this:

Answer 1

The top answer from this post solves this issue. How do I size a UITextView to its content?
The code below is not mine, it is from the answer linked above (simply posting for other's convenience):
let fixedWidth = textView.frame.size.width
textView.sizeThatFits(CGSize(width: fixedWidth, height: CGFloat.max))
let newSize = textView.sizeThatFits(CGSize(width: fixedWidth, height:CGFloat.max))
var newFrame = textView.frame
newFrame.size = CGSize(width: max(newSize.width, fixedWidth), height: newSize.height)
textView.frame = newFrame;

Answer 2

The code below might be the solution for this problem you got.
func textViewDidChange(textView: UITextView) {
var newFrame = textView.frame
var minHeight = 40 // ENTER THE MIN HEIGHT OR THE INITIAL HEIGHT OF THE TEXTVIEW
var maxHeight = 100 // ENTER THE MAX HEIGHT YOU WANT
newFrame.size = textView.sizeThatFits(CGSizeMake(newFrame.size.width, maxHeight))
if newFrame.size.height > minHeight && newFrame.size.height < maxHeight {
// Change the origin.y value which is 10 to your desired margin for top.
textView.frame = CGRectMake(0, 10, textView.frame.size.width, newFrame.size.height)
}
}

Answer 3

Create a function and add this in your viewDidLoad method, try with:
self.addSubview(containerView)
containerView.addSubview(textView)
containerView.bottomAnchor.constraintEqualToAnchor(self.bottomAnchor).active=true
containerView.leftAnchor.constraintEqualToAnchor(self.leftAnchor).active=true
textView.topAnchor.constraintEqualToAnchor(containerView.topAnchor, constant: 3).active=true
textView.leftAnchor.constraintEqualToAnchor(containerView.leftAnchor, constant: 3).active=true
textView.widthAnchor.constraintEqualToAnchor(containerView.widthAnchor).active=true
textView.heightAnchor.constraintEqualToAnchor(containerView.heightAnchor).active=true

Answer 4

use textview textContainerInset method for achieving what u want
//insets are top, left, bottom, top..
tv.textContainerInset = UIEdgeInsetsMake(0,0,0,0);
after setting this method,when textview line starts, increase height of textview for finding the textview next line start,
use method:- TextViewDidChange