WWDC22 SALE: Save 50% on all my Swift books and bundles! >>

SOLVED: I want to store formatted text in Realm Swift database

Forums > Swift

noob swift guy here. I have this UITextView where the user writes something. I need to store his "note" to the database with all the formated text in it. That means if it has bold, I need to display it as bold later. This text should be stored in local Realm Swift Database. Any solutions how can I achieve that? I head about "Markdown", but I didn't understand how it works.

Much thanks! Have a great day!


Copied from StackOverflow

Note to everyone. This question is a copy/ paste from StackOverflow. He even copied the spelling error "head". It was answered in StackOverflow. StackOverflow contributor "Jay" provided this excellent answer.

Question for the forum contributors and @twostraws: Do we want this forum to become a copy / paste factory?

Realm only stores ascii text and cannot directly store any formatting properties like BOLD, and that's true for most databases.

If you want to store formatted strings, one option is to archive it to a Data type, which Realm fully supports. Then, when reading data back in, unarchive it from Data back to a formatted string. (formatted strings are often called Rich Text or in code: attributedStrings)

The below code is macOS but iOS will be similar

A quick example - here's a class to hold a some attributed string data

class MyAttrStringClass: Object {
   @Persisted var attrStringData: Data!

Suppose we have a (rich) text field with the following text

Hello, World

To store the class with the attributed string in Realm:

let s = self.myRichTextField.attributedStringValue
let data = try! NSKeyedArchiver.archivedData(withRootObject: s, requiringSecureCoding: false)

let myObject = MyAttrStringClass()
myObject.attrStringData = data

try! realm.write {

then when reading back from Realm and displaying the attributed string in that same field

let myObject = realm.objects(MyAttrStringClass.self).first!

let data = myObject.attrStringData!
let s = try! NSKeyedUnarchiver.unarchivedObject(ofClass: NSAttributedString.self, from: data)

self.myRichTextField.attributedStringValue = s!

Note: there's no error checking in the above. Please protect your code by safely unwrapping optionals.


Hacking with Swift is sponsored by Emerge

SPONSORED Why are Swift reference types bad for app startup time, and what’s the performance cost of protocol conformances? That’s just a couple of the topics you can learn about on the Emerge blog — written by the app performance experts behind Emerge’s advanced app optimization and monitoring tools, based on their experience of working at companies like Apple, Airbnb, Snap, and Spotify.

Find out more

Sponsor Hacking with Swift and reach the world's largest Swift community!

Reply to this topic…

You need to create an account or log in to reply.

All interactions here are governed by our code of conduct.

Unknown user

You are not logged in

Log in or create account

Link copied to your pasteboard.