Figure out size of UILabel based on String in Swift

Question

I am trying to calculate the height of a UILabel based on different String lengths   func calculateContentHeight   - gt  CGFloat      var maxLabelSize  CGSize   CGSizeMake frame size width - 48  CGFloat 9999       var contentNSString   contentText as NSString     var expectedLabelSize   contentNSString boundingRectWithSize maxLabelSize  options  NSStringDrawingOptions UsesLineFragmentOrigin  attributes   NSFontAttributeName  UIFont systemFontOfSize 16 0    context  nil      print    expectedLabelSize        return expectedLabelSize size height      Above is the current function I use to determine the height but it is not working  I would greatly appreciate any help I can get   I would perfer the answer in Swift and not Objective C

User · Answer

This is my answer in Swift 4 1 and Xcode 9 4 1    This is your label let proNameLbl   UILabel frame  CGRect x  0  y  20  width  300  height  height   proNameLbl text    This is your text  proNameLbl font   UIFont systemFont ofSize  17  proNameLbl numberOfLines   0 proNameLbl lineBreakMode    byWordWrapping infoView addSubview proNameLbl     Function to calculate height for label based on text func heightForView text String  font UIFont  width CGFloat  - gt  CGFloat       let label UILabel   UILabel frame  CGRect x  0  y  0  width  width  height  CGFloat greatestFiniteMagnitude       label numberOfLines   0     label lineBreakMode   NSLineBreakMode byWordWrapping     label font   font     label text   text      label sizeToFit       return label frame height     Now you call this function    Call this function let height   heightForView text   This is your text   font  UIFont systemFont ofSize  17   width  300  print height   Output   41 0

User · Answer

IBOutlet weak var constraintTxtV  NSLayoutConstraint  func TextViewDynamicallyIncreaseSize         let contentSize   self txtVDetails sizeThatFits self txtVDetails bounds size      let higntcons   contentSize height     constraintTxtV constant   higntcons

User · Answer

extension String       func widthWithConstrainedHeight   height  CGFloat  font  UIFont  - gt  CGFloat           let constraintRect   CGSize width  CGFloat greatestFiniteMagnitude  height  height           let boundingBox   self boundingRect with  constraintRect  options  NSStringDrawingOptions usesLineFragmentOrigin  attributes   NSFontAttributeName  font   context  nil           return ceil boundingBox width             func heightWithConstrainedWidth   width  CGFloat  font  UIFont  - gt  CGFloat            let constraintRect   CGSize width  width  height  CGFloat greatestFiniteMagnitude          let boundingBox   self boundingRect with  constraintRect  options  NSStringDrawingOptions usesLineFragmentOrigin  attributes   NSFontAttributeName  font   context  nil           return ceil boundingBox height

User · Answer

Swift 5   If you have UILabel and someway boundingRect isn t working for you  I faced this problem  It always returned 1 line height   there is an extension to easily calculate label size   extension UILabel       func getSize constrainedWidth  CGFloat  - gt  CGSize           return systemLayoutSizeFitting CGSize width  constrainedWidth  height  UIView layoutFittingCompressedSize height   withHorizontalFittingPriority   required  verticalFittingPriority   fittingSizeLevel            You can use it like this   let label   UILabel   label text    My text nIs nAwesome  let labelSize   label getSize constrainedWidth 200 0    Works for me

User · Answer

Use an extension on String Swift 3 extension String       func height withConstrainedWidth width  CGFloat  font  UIFont  - gt  CGFloat           let constraintRect   CGSize width  width  height   greatestFiniteMagnitude          let boundingBox   self boundingRect with  constraintRect  options   usesLineFragmentOrigin  attributes   NSFontAttributeName  font   context  nil               return ceil boundingBox height             func width withConstrainedHeight height  CGFloat  font  UIFont  - gt  CGFloat           let constraintRect   CGSize width   greatestFiniteMagnitude  height  height          let boundingBox   self boundingRect with  constraintRect  options   usesLineFragmentOrigin  attributes   NSFontAttributeName  font   context  nil           return ceil boundingBox width           and also on NSAttributedString  which is very useful at times  extension NSAttributedString       func height withConstrainedWidth width  CGFloat  - gt  CGFloat           let constraintRect   CGSize width  width  height   greatestFiniteMagnitude          let boundingBox   boundingRect with  constraintRect  options   usesLineFragmentOrigin  context  nil               return ceil boundingBox height             func width withConstrainedHeight height  CGFloat  - gt  CGFloat           let constraintRect   CGSize width   greatestFiniteMagnitude  height  height          let boundingBox   boundingRect with  constraintRect  options   usesLineFragmentOrigin  context  nil               return ceil boundingBox width           Swift 4  amp  5 Just change the value for attributes in the extension String methods from  NSFontAttributeName  font   to   font   font

User · Answer

Check label text height and it is working on it     let labelTextSize     labelDescription text   as NSString  boundingRect                  with  CGSize width  labelDescription frame width  height   greatestFiniteMagnitude                   options   usesLineFragmentOrigin                  attributes    font  labelDescription font                   context  nil  size             if labelTextSize height  gt  labelDescription bounds height                   viewMoreOrLess hide byHeight  false                  viewLess hide byHeight  false                            else                   viewMoreOrLess hide byHeight  true                  viewLess hide byHeight  true

User · Answer

Heres a simple solution thats working for me    similar to some of the others posted  but it doesn t not include the need for calling sizeToFit  Note this is written in Swift 5  let lbl   UILabel   lbl numberOfLines   0 lbl font   UIFont systemFont ofSize  12     make sure you set this correctly  lbl text    My text that may or may not wrap lines      let width   100 0    the width of the view you are constraint to  keep in mind any applied margins here  let height   lbl systemLayoutSizeFitting CGSize width  width  height  UIView layoutFittingCompressedSize height   withHorizontalFittingPriority   required  verticalFittingPriority   fittingSizeLevel  height   This handles line wrapping and such  Not the most elegant code  but it gets the job done

User · Answer

In Swift 5  label textRect forBounds  label bounds  limitedToNumberOfLines  1   btw  the value of limitedToNumberOfLines depends on your label s text lines you want

User · Answer

This solution will help to calculate the height and width at runtime           let messageText    Your Text String      let size   CGSize init width  250  height  1000      let options   NSStringDrawingOptions usesFontLeading union  usesLineFragmentOrigin      let estimateFrame   NSString string  messageText  boundingRect with   size  options  options  attributes   NSAttributedString Key font  UIFont name   HelveticaNeue   size  17     context  nil    Here you can calculate the estimated height that your string would take and pass it to the UILabel frame   estimateFrame Width estimateFrame Height

User · Answer

For multiline text this answer is not working correctly   You can build a different String extension by using UILabel   extension String   func height constraintedWidth width  CGFloat  font  UIFont  - gt  CGFloat       let label    UILabel frame  CGRect x  0  y  0  width  width  height   greatestFiniteMagnitude       label numberOfLines   0     label text   self     label font   font     label sizeToFit        return label frame height        The UILabel gets a fixed width and the  numberOfLines is set to 0  By adding the text and calling  sizeToFit   it automatically adjusts to the correct height    Code is written in Swift 3

User · Answer

I found that the accepted answer worked for a fixed width  but not a fixed height   For a fixed height  it would just increase the width to fit everything on one line  unless there was a line break in the text   The width function calls the height function multiple times  but it is a quick calculation and I didn t notice performance issues using the function in the rows of a UITable   extension String        public func height withConstrainedWidth width  CGFloat  font  UIFont  - gt  CGFloat           let constraintRect   CGSize width  width  height   greatestFiniteMagnitude          let boundingBox   self boundingRect with  constraintRect  options   usesLineFragmentOrigin  attributes    font   font   context  nil           return ceil boundingBox height             public func width withConstrainedHeight height  CGFloat  font  UIFont  minimumTextWrapWidth CGFloat  - gt  CGFloat            var textWidth CGFloat   minimumTextWrapWidth         let incrementWidth CGFloat   minimumTextWrapWidth   0 1         var textHeight CGFloat   self height withConstrainedWidth  textWidth  font  font             Increase width by 10  of minimumTextWrapWidth until minimum width found that makes the text fit within the specified height         while textHeight  gt  height               textWidth    incrementWidth             textHeight   self height withConstrainedWidth  textWidth  font  font                    return ceil textWidth

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