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++;
    }
}

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;
                }
            }