Resize font size to fill UITextView?

Question

How would I set the font size of text in a UITextView such that it fills the entire UITextView? I\'d like the user to type in their text, then have the text fill the entire

Answer 1

In viewDidLoad:

textView.textContainer.lineFragmentPadding = 0;
textView.textContainerInset = UIEdgeInsetsMake(0, 0, 0, 0);

You need to add UITextViewDelegate:

- (void)updateTextFont:(UITextView *)textView {

    CGSize textViewSize = textView.frame.size;
    CGSize sizeOfText = [textView.text sizeWithAttributes:@{NSFontAttributeName: textView.font}];

    CGFloat fontOfWidth = floorf(textView.font.pointSize / sizeOfText.height * textViewSize.height);
    CGFloat fontOfHeight = floorf(textView.font.pointSize / sizeOfText.width * textViewSize.width);

    textView.font = [textView.font fontWithSize:MIN(fontOfHeight, fontOfWidth)];
}

Answer 2

Here is my sample code. Basically, I check the expect size to know if font size need to increase or decrease. You need to add UITextViewDelegate to your class to make sure it workings

- (void)updateTextFont:(UITextView *)textView
{
    // Only run if has text, otherwise it will make infinity loop
    if (textView.text.length == 0 || CGSizeEqualToSize(textView.bounds.size, CGSizeZero)) return;

    /*
     - Update textView font size
     If expectHeight > textViewHeight => descrease font size n point until it reach textViewHeight
     If expectHeight < textViewHeight => inscrease font size n point until it reach textViewHeight
     */
    CGSize textViewSize = textView.frame.size;
    CGFloat fixedWidth = textViewSize.width;
    CGSize expectSize = [textView sizeThatFits:CGSizeMake(fixedWidth, MAXFLOAT)];

    UIFont *expectFont = textView.font;
    if (expectSize.height > textViewSize.height) {
        while ([textView sizeThatFits:CGSizeMake(fixedWidth, MAXFLOAT)].height > textViewSize.height) {
            expectFont = [textView.font fontWithSize:(textView.font.pointSize-1)];
            textView.font = expectFont;
        }
    } else {
        while ([textView sizeThatFits:CGSizeMake(fixedWidth, MAXFLOAT)].height < textViewSize.height) {
            expectFont = textView.font;
            textView.font = [textView.font fontWithSize:(textView.font.pointSize+1)];
        }
        textView.font = expectFont;
    }
}

Answer 3

U can easily do this by using

• self.textview.font =

self.textview.font = UIFont(name: self.textview.font!.fontName,
size: self.textview.frame.size.height / 10)!

divide textview.frame.size.height upon some constant based on your requirement..