Reputation: 566

Underline text in a UITextView

How can I underline text in a UITextView. I understand that I would need to create a subclass of UITextView, but what would go under drawRect:?

Thanks.

Upvotes: 11

Answers (14)

Dmytro Volokhovskyi

Reputation: 1

       let someString = NSMutableAttributedString(string: "Your String", attributes: [NSAttributedString.Key.font : UIFont.boldSystemFont(ofSize: 20), NSAttributedString.Key.underlineStyle : NSUnderlineStyle.single.rawValue])
        someStringTextView.attributedText = titleAT

U can just give your string a bunch of attributes like bold, underlined etc.

Upvotes: 0

Kivia Martins Brito

Reputation: 281

Swift 5. As my UITextView if for inserting text, I created an extension function as bellow.

extension UITextView {

  func underlined() {
    let border = CALayer()
    let width = CGFloat(1.0)
    border.borderColor = UIColor.lightGray.cgColor
    border.frame = CGRect(x: 0, y: self.frame.size.height - 5, width:  self.frame.size.width, height: 1)
    border.borderWidth = width
    self.layer.addSublayer(border)
    self.layer.masksToBounds = true
    let style = NSMutableParagraphStyle()
    style.lineSpacing = 15
    let attributes = [NSAttributedString.Key.paragraphStyle : style, NSAttributedString.Key.foregroundColor : UIColor.darkGray, NSAttributedString.Key.font :  UIFont.systemFont(ofSize: 13)]
    self.attributedText = NSAttributedString(string: self.text, attributes: attributes)
  }

}

The border is drawling the line and the style is adding the spacing between the lines. Usage in your UIView custom layout:

override func layoutSubviews() {
    super.layoutSubviews()
    self.dateAndTimeInput.underlined()
  }

Image with the result

Upvotes: 0

jaytrixz

Reputation: 4079

This is how I did it using Swift 5:

let attributedString = NSMutableAttributedString(string: myTextView.text ?? "")
myTextView.linkTextAttributes = [NSAttributedString.Key(rawValue: NSAttributedString.Key.underlineStyle.rawValue): NSUnderlineStyle.single.rawValue] as [NSAttributedString.Key: Any]?
myTextView.attributedText = attributedString

Upvotes: 0

Tayo119

Reputation: 341

You can't use "kCTUnderlineStyleAttributeName" or "kCTUnderlineStyleSingle" Now you must do it like this:

    NSMutableAttributedString *attString = [[NSMutableAttributedString alloc] initWithString:@"Text"];
[attString addAttribute:NSUnderlineStyleAttributeName
                  value:@(NSUnderlineStyleSingle)
                  range:(NSRange){0,[attString length]}];

Upvotes: 1

user3651677

Reputation: 69

-(IBAction)underline:(id)sender
{
    NSDictionary *underlineAttribute = @{NSUnderlineStyleAttributeName: @(NSUnderlineStyleSingle)};
    texts.attributedText = [[NSAttributedString alloc] initWithString:texts.text
                                                           attributes:underlineAttribute];
}

Upvotes: 1

jose920405

Reputation: 8057

textViewMessage.linkTextAttributes = @{NSForegroundColorAttributeName: [UIColor blueColor], NSUnderlineStyleAttributeName: [NSNumber numberWithInt:NSUnderlineStyleSingle]};

Upvotes: 2

Adam Johns

Reputation: 36373

If this is static text, you can underline it in Interface Builder. Make sure to make the text 'Attributed' first by selecting 'Attributed' in the drop down menu:

enter image description here

Upvotes: 8

Ray Fix

Reputation: 5655

If you want to avoid having to include CoreText, you can utilize an attributed string with this attribute:

@{NSUnderlineStyleAttributeName: @(NSUnderlineStyleSingle)}

Upvotes: 8

Anjali soni

Reputation: 1

To underline a text, you have to go where you can select copy, cut , delete options there are now more options like B/I/U( bold, italic, underline). Choose this option and this is it. And to unable it, choose underline option again.

Upvotes: -3

yebw

Reputation: 247

I recommend you to use MFUnderlinedTextView, it will be helpful.

Upvotes: 0

iDev

Reputation: 23278

Try to use NSAttributedString as follows and set in UITextView. This works for iOS6.

NSMutableAttributedString *attString = [[NSMutableAttributedString alloc] initWithString:@"Some String"];
[attString addAttribute:(NSString*)kCTUnderlineStyleAttributeName 
                   value:[NSNumber numberWithInt:kCTUnderlineStyleSingle] 
                   range:(NSRange){0,[attString length]}];

For more info on NSAttributedString check this How do you use NSAttributedString?

For eg:-

textView.attributedText = attString;

From apple documentation on UITextView,

In iOS 6 and later, this class supports multiple text styles through use of the attributedText property. (Styled text is not supported in earlier versions of iOS.) Setting a value for this property causes the text view to use the style information provided in the attributed string. You can still use the font, textColor, and textAlignment properties to set style attributes, but those properties apply to all of the text in the text view.

attributedText:

The styled text displayed by the text view.

@property(nonatomic,copy) NSAttributedString *attributedText

Discussion: This property is nil by default. Assigning a new value to this property also replaces the value of the text property with the same string data, albeit without any formatting information. In addition, assigning a new a value updates the values in the font, textColor, and textAlignment properties so that they reflect the style information starting at location 0 in the attributed string.

Upvotes: 23

Mathew Varghese

Reputation: 4527

I recommend you to use CoreText. A Basic tutorial is here on raywenderlich.

Upvotes: 0

Solidus

Reputation: 251

If you want to format your text (with underlined words, links, colored words...) I suggest you to use FTCoreText

Upvotes: 1

rmaddy

Reputation: 318934

If you are using iOS 6 then you can use the attributedText attribute of UITextView. Apply underline formatting to the text. You can also set the typingAttributes property to ensure the text that the user types has a specific set of formatting if you wish.

Upvotes: 0

Underline text in a UITextView

Answers (14)

attributedText:

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