Size-to-Fit Text in UITextView

UITextView.m

#define kDefaultFontSize 24.0

myTextView.text = @"Some long string that will be in the UITextView";
myTextView.font = [UIFont systemFontOfSize:kDefaultFontSize];

//setup text resizing check here
if (myTextView.contentSize.height > myTextView.frame.size.height) {
    int fontIncrement = 1;
    while (myTextView.contentSize.height > myTextView.frame.size.height) {
        myTextView.font = [UIFont systemFontOfSize:kDefaultFontSize-fontIncrement];
        fontIncrement++;
    }
}

Hi! I'm struggling with this right now. I've seen similar solutions on SO, but I don't know where to put the check and while loop. I tried in textViewShouldChange() and textViewDidChange() logging out the content size and the frame size. But they are always the same. Any suggestions? Thanks.

This is next level

how to set width of uitext view

Swift 5:

var fontSize = 24
let family = UIFont.systemFont(ofSize: fontSize).familyName
if (myTextView.contentSize.height > myTextView.frame.size.height) {
                var fontIncrement = 1.0;
                while (myTextView.contentSize.height > myTextView.frame.size.height) {
                    fontSize = CGFloat(fontSize - fontIncrement)
                    myTextView.font = UIFont(name: family, size: fontSize)
                    fontIncrement+=1;
                }
            }