ios swift: Is it possible to change the font style of a certain word in a string?

by

If you already know the longest word you have to get the range of that word in the string. I prefer the NSString method rangeOfString: for this.

You then create a NSMutableAttributedString from the string, with your default attributes. Finally you apply highlighting attributes to the range you figured out earlier. 

let longString = "Lorem ipsum dolor. VeryLongWord ipsum foobar"
let longestWord = "VeryLongWord"

let longestWordRange = (longString as NSString).rangeOfString(longestWord)

let attributedString = NSMutableAttributedString(string: longString, attributes: [NSFontAttributeName : UIFont.systemFontOfSize(20)])

attributedString.setAttributes([NSFontAttributeName : UIFont.boldSystemFontOfSize(20), NSForegroundColorAttributeName : UIColor.redColor()], range: longestWordRange)


label.attributedText = attributedString

Update for Swift 5.0

let longestWordRange = (longString as NSString).range(of: longestWord)

let attributedString = NSMutableAttributedString(string: longString, attributes: [NSAttributedStringKey.font : UIFont.systemFont(ofSize: 20)])

attributedString.setAttributes([NSAttributedStringKey.font : UIFont.boldSystemFont(ofSize: 20), NSAttributedStringKey.foregroundColor : UIColor.red], range: longestWordRange)

Which looks like this in my playground:

enter image description here

More Related Contents:

  1. Cannot convert value of type string to type url in coercion
  2. Upload image with parameters in Swift
  3. Safe Area of Xcode 9
  4. Convert HTML to Plain Text in Swift
  5. DateFormatter’s returns nil for specific date strings without time in Swift
  6. How do I open phone settings when a button is clicked?
  7. Get User’s Current Location / Coordinates
  8. NSRange from Swift Range?
  9. ITMS-90809: Deprecated API Usage — Apple will stop accepting submissions of apps that use UIWebView APIs
  10. appearanceWhenContainedIn in Swift
  11. first and last day of the current month in swift
  12. Send POST parameters with MultipartFormData using Alamofire, in iOS Swift
  13. UIScrollView scroll to bottom programmatically
  14. How to use UIView autoresizingMask property programmatically?
  15. How to create a Scroll View with a page control using swift? [closed]
  16. Store [String] in NSUserDefaults
  17. Getting device orientation in Swift
  18. How to set image for bar button with swift?
  19. How to send a silent Push Notification payload
  20. SwiftUI Hide TabView bar inside NavigationLink views
  21. Unexpected non-void return value in void function Swift3
  22. How to detect Apps first launch in iOS?
  23. Why can’t I invert my image back to original with CIFilter in my Swift iOS app
  24. Comparing NSDates without time component
  25. UIVisualEffectView with mask layer
  26. AudioKit: Using the new AKSequencer with any variety of the callback instruments
  27. null / nil in swift language
  28. NavigationView and NavigationLink on button click in SwiftUI?
  29. How to create negative Firebase timestamp in swift
  30. SwiftUI modal presentation works only once from navigationBarItems

Leave a Comment