Copied from StackOverflow

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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?

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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 {
    realm.add(myObject)
}

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.