How do I size a UITextView to its content?

Question

Is there a good way to adjust the size of a UITextView to conform to its content? Say for instance I have a UITextView that contains one line of text:

"Hello world"

I then add another line of text:

"Goodbye world"

Is there a good way in Cocoa Touch to get the rect that will hold all of the lines in the text view so that I can adjust the parent view accordingly?

As another example, look at the notes' field for events in the Calendar application - note how the cell (and the UITextView it contains) expands to hold all lines of text in the notes' string.

Answer 1

Swift :

textView.sizeToFit()

Answer 2

This worked nicely when I needed to make text in a UITextView fit a specific area:

// The text must already be added to the subview, or contentviewsize will be wrong.

- (void) reduceFontToFit: (UITextView *)tv {
    UIFont *font = tv.font;
    double pointSize = font.pointSize;

    while (tv.contentSize.height > tv.frame.size.height && pointSize > 7.0) {
        pointSize -= 1.0;
        UIFont *newFont = [UIFont fontWithName:font.fontName size:pointSize];
        tv.font = newFont;
    }
    if (pointSize != font.pointSize)
        NSLog(@"font down to %.1f from %.1f", pointSize, tv.font.pointSize);
}

Answer 3

here is the swift version of @jhibberd

    let cell:MsgTableViewCell! = self.tableView.dequeueReusableCellWithIdentifier("MsgTableViewCell", forIndexPath: indexPath) as? MsgTableViewCell
    cell.msgText.text = self.items[indexPath.row]
    var fixedWidth:CGFloat = cell.msgText.frame.size.width
    var size:CGSize = CGSize(width: fixedWidth,height: CGFloat.max)
    var newSize:CGSize = cell.msgText.sizeThatFits(size)
    var newFrame:CGRect = cell.msgText.frame;
    newFrame.size = CGSizeMake(CGFloat(fmaxf(Float(newSize.width), Float(fixedWidth))), newSize.height);
    cell.msgText.frame = newFrame
    cell.msgText.frame.size = newSize        
    return cell

Answer 4

Did you try [textView sizeThatFits:textView.bounds] ?

Edit: sizeThatFits returns the size but does not actually resize the component. I'm not sure if that's what you want, or if [textView sizeToFit] is more what you were looking for. In either case, I do not know if it will perfectly fit the content like you want, but it's the first thing to try.

Answer 5

For iOS 7.0, instead of setting the frame.size.height to the contentSize.height (which currently does nothing) use [textView sizeToFit].

See this question.

Answer 6

For those who want the textview to actually move up and maintain the bottom line position

CGRect frame = textView.frame;
frame.size.height = textView.contentSize.height;

if(frame.size.height > textView.frame.size.height){
    CGFloat diff = frame.size.height - textView.frame.size.height;
    textView.frame = CGRectMake(0, textView.frame.origin.y - diff, textView.frame.size.width, frame.size.height);
}
else if(frame.size.height < textView.frame.size.height){
    CGFloat diff = textView.frame.size.height - frame.size.height;
    textView.frame = CGRectMake(0, textView.frame.origin.y + diff, textView.frame.size.width, frame.size.height);
}