How to underline a UILabel in swift

Question

How to underline a UILabel in Swift  I searched the Objective-C ones but couldn t quite get them to work in Swift

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Just a little fix for the Shlome answer in Swift 4 and Xcode 9   extension UILabel       func underline             if let textString   self text               let attributedString   NSMutableAttributedString string  textString              attributedString addAttribute NSAttributedStringKey underlineStyle                                            value  NSUnderlineStyle styleSingle rawValue                                            range  NSRange location  0  length  attributedString length - 1               attributedText   attributedString                        extension UIButton           func underline                 let attributedString   NSMutableAttributedString string   self titleLabel  text                 attributedString addAttribute NSAttributedStringKey underlineStyle                                            value  NSUnderlineStyle styleSingle rawValue                                            range  NSRange location  0  length   self titleLabel  text  count                 self setAttributedTitle attributedString  for   normal

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If you are looking for a way to do this without inheritance  Swift 5 extension UILabel       func underline             if let textString   self text             let attributedString   NSMutableAttributedString string  textString              attributedString addAttribute NSAttributedString Key underlineStyle                                            value  NSUnderlineStyle single rawValue                                            range  NSRange location  0  length  attributedString length             attributedText   attributedString                    Swift 3 4    in swift 4 - switch NSUnderlineStyleAttributeName with NSAttributedStringKey underlineStyle extension UILabel       func underline             if let textString   self text             let attributedString   NSMutableAttributedString string  textString            attributedString addAttribute NSUnderlineStyleAttributeName  value  NSUnderlineStyle styleSingle rawValue  range  NSRange location  0  length  attributedString length             attributedText   attributedString                     extension UIButton     func underline         let attributedString   NSMutableAttributedString string   self titleLabel  text         attributedString addAttribute NSUnderlineStyleAttributeName  value  NSUnderlineStyle styleSingle rawValue  range  NSRange location  0  length   self titleLabel  text  characters count         self setAttributedTitle attributedString  for   normal

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Swift 5  amp  4 2 one liner   label attributedText   NSAttributedString string   Text   attributes        underlineStyle  NSUnderlineStyle single rawValue     Swift 4 one liner   label attributedText   NSAttributedString string   Text   attributes        underlineStyle  NSUnderlineStyle styleSingle rawValue     Swift 3 one liner   label attributedText   NSAttributedString string   Text   attributes         NSUnderlineStyleAttributeName  NSUnderlineStyle styleSingle rawValue

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Underline to multiple strings in a sentence   extension UILabel       func underlineMyText range1 String  range2 String            if let textString   self text                let str   NSString string  textString              let firstRange   str range of  range1              let secRange   str range of  range2              let attributedString   NSMutableAttributedString string  textString              attributedString addAttribute NSAttributedString Key underlineStyle  value  NSUnderlineStyle single rawValue  range  firstRange              attributedString addAttribute NSAttributedString Key underlineStyle  value  NSUnderlineStyle single rawValue  range  secRange              attributedText   attributedString                     Use by this way       lbl text    By continuing you agree to our Terms of Service and Privacy Policy       lbl underlineMyText range1   Terms of Service   range2   Privacy Policy

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You can do this using NSAttributedString Example  let underlineAttribute    NSAttributedString Key underlineStyle  NSUnderlineStyle thick rawValue  let underlineAttributedString   NSAttributedString string   quot StringWithUnderLine quot   attributes  underlineAttribute  myLabel attributedText   underlineAttributedString  EDIT To have the same attributes for all texts of one UILabel  I suggest you to subclass UILabel and overriding text  like that  Swift 5 Same as Swift 4 2 but  You should prefer the Swift initializer NSRange over the old NSMakeRange  you can shorten to  underlineStyle and linebreaks improve readibility for long method calls  class UnderlinedLabel  UILabel    override var text  String        didSet           guard let text   text else   return           let textRange   NSRange location  0  length  text count          let attributedText   NSMutableAttributedString string  text          attributedText addAttribute  underlineStyle                                      value  NSUnderlineStyle single rawValue                                      range  textRange             Add other attributes if needed         self attributedText   attributedText                    Swift 4 2 class UnderlinedLabel  UILabel    override var text  String        didSet           guard let text   text else   return           let textRange   NSMakeRange 0  text count          let attributedText   NSMutableAttributedString string  text          attributedText addAttribute NSAttributedString Key underlineStyle   value  NSUnderlineStyle single rawValue  range  textRange             Add other attributes if needed         self attributedText   attributedText                    Swift 3 0 class UnderlinedLabel  UILabel            override var text  String            didSet               guard let text   text else   return               let textRange   NSMakeRange 0  text characters count              let attributedText   NSMutableAttributedString string  text              attributedText addAttribute NSUnderlineStyleAttributeName   value  NSUnderlineStyle styleSingle rawValue  range  textRange                 Add other attributes if needed             self attributedText   attributedText                    And you put your text like this    IBOutlet weak var label  UnderlinedLabel           override func viewDidLoad             super viewDidLoad                    label text    quot StringWithUnderLine quot         OLD  Swift  2 0 to 2 3   class UnderlinedLabel  UILabel            override var text  String            didSet               guard let text   text else   return               let textRange   NSMakeRange 0  text characters count              let attributedText   NSMutableAttributedString string  text              attributedText addAttribute NSUnderlineStyleAttributeName  value NSUnderlineStyle StyleSingle rawValue  range  textRange                 Add other attributes if needed                          self attributedText   attributedText                    Swift 1 2  class UnderlinedLabel  UILabel            override var text  String            didSet               let textRange   NSMakeRange 0  count text               let attributedText   NSMutableAttributedString string  text              attributedText addAttribute NSUnderlineStyleAttributeName  value NSUnderlineStyle StyleSingle rawValue  range  textRange                 Add other attributes if needed                          self attributedText   attributedText

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Swift 4 changes   Remeber to use NSUnderlineStyle styleSingle rawValue instead of NSUnderlineStyle styleSingle        let attributedString   NSAttributedString string   Testing       let textRange   NSMakeRange 0  attributedString length      let underlinedMessage   NSMutableAttributedString attributedString  attributedString      underlinedMessage addAttribute NSAttributedStringKey underlineStyle                                     value NSUnderlineStyle styleSingle rawValue                                     range  textRange      label attributedText   underlinedMessage

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You can underline the UILabel text using Interface Builder      Here is the link of my answer   Adding underline attribute to partial text UILabel in storyboard

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I have algorithm that used in my app  In this algorithm you can underline substring even that have space between words extension NSMutableAttributedString       static func  findSubStringAndUnderlineIt subStringToBeFound   String totalString   String - gt   NSMutableAttributedString                    let attributedString   NSMutableAttributedString string  totalString           var spaceCount   0                  if subStringToBeFound contains  quot   quot                spaceCount   subStringToBeFound components separatedBy  quot   quot   count-1                             if  let range   attributedString string range of  subStringToBeFound  options   caseInsensitive                        attributedString addAttribute NSAttributedString Key underlineStyle  value  NSUnderlineStyle single rawValue  range  NSMakeRange  range lowerBound utf16Offset in  subStringToBeFound     range upperBound utf16Offset in  subStringToBeFound                 spaceCount                   return attributedString                   return attributedString                        in used section  lblWarning attributedText   NSMutableAttributedString findSubStringAndUnderlineIt subStringToBeFound  quot Not  Sadece uygulamanin reklamlari kaldirilacaktir  quot   totalString  lblWarning text

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A class to set and remove underline for UIbuttons for Swift 5  I hope this helps import Foundation    import UIKit     class UiUtil           static let underlineThickness   2             class func removeUnderlineFromButton    button UIButton               if let str   button titleLabel  attributedText               let attributedString   NSMutableAttributedString  attributedString  str               attributedString removeAttribute  underlineStyle  range      NSRange init location  0  length  attributedString length               button setAttributedTitle attributedString  for   normal                          class func setUnderlineFromButton    button UIButton             if let str   button titleLabel  attributedText               let attributedStringUnderline   NSMutableAttributedString  attributedString       str                  attributedStringUnderline addAttribute                  NSAttributedString Key underlineStyle                  value  underlineThickness                  range  NSRange init location  0  length  attributedStringUnderline length                                button setAttributedTitle attributedStringUnderline  for   normal

User · Answer

For Swift 2 3   extension UIButton       func underline             let attributedString   NSMutableAttributedString string   self titleLabel  text             attributedString addAttribute NSUnderlineStyleAttributeName  value  NSUnderlineStyle StyleSingle rawValue  range  NSRange location  0  length   self titleLabel  text  characters count             self setAttributedTitle attributedString  forState   Normal            and in ViewController    IBOutlet var yourButton  UIButton    in ViewDidLoad Method or in your function just write   yourButton underline     it will underline the title of your button

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The answer above is causing an error in my build environment   This doesn t work in Swift 4 0   attributedText addAttribute NSUnderlineStyleAttributeName                               value  NSUnderlineStyle styleSingle rawValue                               range  textRange    Try this instead   attributedText addAttribute NSAttributedStringKey underlineStyle                              value  NSUnderlineStyle styleSingle rawValue                              range  textRange    hope this helps someone

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Swift 4  4 2 and 5       IBOutlet weak var lblUnderLine  UILabel    I need to underline particular text in UILabel  So  find range and set attributes       let strSignup    Don t have account  SIGNUP NOW       let rangeSignUp   NSString string  strSignup  range of   SIGNUP NOW    options  String CompareOptions caseInsensitive      let rangeFull   NSString string  strSignup  range of  strSignup  options  String CompareOptions caseInsensitive      let attrStr   NSMutableAttributedString init string strSignup      attrStr addAttributes  NSAttributedString Key foregroundColor   UIColor white                             NSAttributedString Key font   UIFont init name   Helvetica   size  17   as Any  range  rangeFull      attrStr addAttributes  NSAttributedString Key foregroundColor   UIColor white                             NSAttributedString Key font   UIFont init name   Helvetica   size  20                              NSAttributedString Key underlineStyle  NSUnderlineStyle thick rawValue as Any  range  rangeSignUp     for swift 4 - gt  Change thick to styleThick     lblUnderLine attributedText   attrStr   Output

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Swift 4 Version   let attributedString    NSMutableAttributedString string   Your Text Here   attributes   NSAttributedStringKey underlineStyle   true    self yourlabel attributedText   attributedString

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You can use this also if you want to achieve only half part of label as underline -    For Swift 4 0   let attributesForUnderLine   NSAttributedString Key  Any                   font  UIFont name  AppFont sourceSansPro Regular  size  12     UIFont systemFont ofSize  11                foregroundColor  UIColor blue               underlineStyle  NSUnderlineStyle single rawValue           let attributesForNormalText   NSAttributedString Key  Any                   font  UIFont name  AppFont sourceSansPro Regular  size  12     UIFont systemFont ofSize  11                foregroundColor  AppColors ColorText 787878           let textToSet    Want to change your preferences  Edit Now          let rangeOfUnderLine    textToSet as NSString  range of   Edit Now           let rangeOfNormalText    textToSet as NSString  range of   Want to change your preferences             let attributedText   NSMutableAttributedString string  textToSet          attributedText addAttributes attributesForUnderLine  range  rangeOfUnderLine          attributedText addAttributes attributesForNormalText  range  rangeOfNormalText          yourLabel attributedText   attributedText

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Swift 5  1- Create a String extension to get attributedText extension String        var underLined  NSAttributedString           NSMutableAttributedString string  self  attributes    underlineStyle  NSUnderlineStyle single rawValue             2- Use it On buttons  button setAttributedTitle yourButtonTitle underLined  for   normal   On Labels  label attributedText   yourLabelTitle underLined  Or Stoyboard version

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Same Answer in Swift 4 2  For UILable  extension UILabel       func underline             if let textString   self text               let attributedString   NSMutableAttributedString string  textString              attributedString addAttribute NSAttributedString Key underlineStyle                                            value  NSUnderlineStyle single rawValue                                            range  NSRange location  0  length  textString count               self attributedText   attributedString                     Call for UILabel like below  myLable underline     For UIButton  extension UIButton       func underline             if let textString   self titleLabel  text                let attributedString   NSMutableAttributedString string  textString              attributedString addAttribute NSAttributedString Key underlineStyle                                            value  NSUnderlineStyle single rawValue                                            range  NSRange location  0  length  textString count               self setAttributedTitle attributedString  for   normal                       Call for UIButton like below  myButton underline     I looked into above answers and some of them are force unwrapping text value  I will suggest to get value by safely unwrapping  This will avoid crash in case of nil value  Hope This helps

[ios] How to underline a UILabel in swift?

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