Append formatted string to already formatted string from UITextView?

Question

How can a NSAttributedString formatted string be appended to an existing textView.attributedText formatted string from UITextView?

From this answer, I can see that a conversion from and to NSMutableAttributedString / NSAttributedString can be done with appendAttributedString() / append() but this does not work when I'm pulling and updating a textView.attributedText like this:

let string2 = NSAttributedString(string: "success", attributes: [NSAttributedStringKey.foregroundColor: UIColor.green])

let newMutableString = textView.attributedText.copy() as! NSMutableAttributedString
newMutableString.append(string2)

textView.attributedText = newMutableString.copy() as! NSAttributedString

Error message:

Could not cast value of type 'NSConcreteAttributedString' (0x10c7dff30) to 'NSMutableAttributedString' (0x10c7dff80).

@LinusGeffarth I tried to mock this other answer ... No real reason. Will try removing it. — powtac, Oct 11 '17 at 20:32
@LinusGeffarth seems that the answer from @ tnguyen is the solution! :-) — powtac, Oct 11 '17 at 20:36

score 3 · Accepted Answer · edited Oct 11 '17 at 20:36

3

I believe you need to copy it with mutableCopy because you want to get a mutable copy from an immutable one:

let newMutableString = textView.attributedText.mutableCopy() as! NSMutableAttributedString

edited Oct 11 '17 at 20:36

LinusGeffarth

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answered Oct 11 '17 at 20:30

TNguyen

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Wow that's it! Thanks a lot! – powtac Oct 11 '17 at 20:35

Append formatted string to already formatted string from UITextView?

1 Answers1