Can't get UITextField to autoshrink text

Question

I have a UITextField on a table view cell, and when it\'s text becomes too long I would like the font size to decrease. I want to make it very clear that I am t

Answer 1

Swift 3.0 way to resize the font to fit:

let startFontSize = 14.0
let minFontSize = 7.0

func resizeFont() {
    guard let font = self.font, let text = self.text else {
        return
    }

    let textBounds = self.textRect(forBounds: self.bounds)
    let maxWidth = textBounds.size.width

    for fontSize in stride(from: startFontSize, through: minFontSize, by: -0.5) {
        let size = (text as NSString).size(attributes: [NSFontAttributeName: font.withSize(CGFloat(fontSize))])
        self.font = font.withSize(CGFloat(fontSize))
        if size.width <= maxWidth {
            break
        }
    }
}

Answer 2

Try this its working for me (swift 3.0)

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        // bla bla ... anything inside method you want to do
        // reset font size of textfield
        textField.font = UIFont.systemFont(ofSize: CGFloat(15.0))
        var widthOfText: CGFloat = textField.text!.size(attributes: [NSFontAttributeName: textField.font!]).width
        var widthOfFrame: CGFloat = textField.frame.size.width
        // decrease font size until it fits (25 is constant that works for me)
        while (widthOfFrame - 25) < widthOfText {
            let fontSize: CGFloat = textField.font!.pointSize
            textField.font = textField.font?.withSize(CGFloat(fontSize - 0.5))
            widthOfText = (textField.text?.size(attributes: [NSFontAttributeName: textField.font!]).width)!
            widthOfFrame = textField.frame.size.width
        }
        return true
    }

Answer 3

I had the same problem. The UITextField stoped shrinking the text when it was too long, but instead it resized itself and grew outside its 'bounds'.

The solution that helped me was to set width constraint on given UITextField. After that it did not grew anymore, instead the text inside got smaller as intended. (Of course you have to set minFontSize and check the "adjust to fit" box in storyboard.)

I know it's kind of a late, but if anyone else will find this question via google as I did...it might just help.

Answer 4

-(BOOL)sizeFontToFit:(NSString*)aString minSize:(float)aMinFontSize maxSize:(float)aMaxFontSize 
{   
float fudgeFactor = 16.0;
float fontSize = aMaxFontSize;

self.font = [self.font fontWithSize:fontSize];

CGSize tallerSize = CGSizeMake(self.frame.size.width-fudgeFactor,kMaxFieldHeight);
CGSize stringSize = [aString sizeWithFont:self.font constrainedToSize:tallerSize lineBreakMode:UILineBreakModeWordWrap];

while (stringSize.height >= self.frame.size.height)
       {
       if (fontSize <= aMinFontSize) // it just won't fit
           return NO;

       fontSize -= 1.0;
       self.font = [self.font fontWithSize:fontSize];
       tallerSize = CGSizeMake(self.frame.size.width-fudgeFactor,kMaxFieldHeight);
       stringSize = [aString sizeWithFont:self.font constrainedToSize:tallerSize lineBreakMode:UILineBreakModeWordWrap];
       }

return YES; 
}

Answer 5

My humble solution for this problem was this.... (find the proper size of font on my own - to fit the size of frame) I made it inside delegate method of shouldChangeCharactersInRange:replacementString:

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string

 {

    // bla bla ... anything inside method you want to do

    // reset font size of textfield
    textField.font = [FONT_PROXY fontNormalOfSizeNormal];

    CGFloat widthOfText = [textField.text sizeWithAttributes:@{NSFontAttributeName:textField.font}].width;
    CGFloat widthOfFrame = textField.frame.size.width;

    // decrease font size until it fits (25 is constant that works for me)
    while((widthOfFrame - 25) < widthOfText){
        CGFloat fontSize = textField.font.pointSize;
        textField.font = [textField.font fontWithSize:fontSize - 0.5f];
         widthOfText = [textField.text sizeWithAttributes:@{NSFontAttributeName:textField.font}].width;
         widthOfFrame = textField.frame.size.width;
    }


  }

Answer 6

Can be solved by selecting Line Breaks = Clip in IB