NSMutableAttributedString: How to delete last character programmatically on iOS?

Question

I have a custom keyboard and I have to perform backspace action on textview having nsmutableattributed string as a text (combination of character and nstextattachments)

Answer 1

As per Moxy: if your last character is large enough not to fit within a single UTF-16 unit then Dave's method will just truncate the description of that character. Emojis are an example but there are a bunch more.

So you'll more likely want:

[string deleteCharactersInRange:
    [string.string rangeOfComposedCharacterSequenceAtIndex:string.length - 1]]