Check if there is an emoji contained in a string

Question

I am getting the text size of a string with this

textSize = [[tempDict valueForKeyPath:@\"caption.text\"] sizeWithFont:[UIFont systemFontOfSize:12] constrain         


        

Answer 1

Simple Swift solution with checking every scalar in unicodeScalars are in the set CharacterSet.symbols

extension String {
    var containsEmoji: Bool {
        for scalar in unicodeScalars {
            if CharacterSet.symbols.contains(scalar) {
                return true
            }
        }

        return false
    }
}

But I found some emoji 1.0 items like ℹ️ is not classify as an emoji. So I create this checker:

extension Unicode.Scalar {
    extension Unicode.Scalar {
        var isEmojiMiscSymbol: Bool {
            switch self.value {
            case 0x2030...0x329F:   // Misc symbols
                return true
            default:
                return false
            }
        }
    }
}

And this is the checker which can detect ℹ️:

extension String {
    var containsEmoji: Bool {
        for scalar in unicodeScalars {
            if CharacterSet.symbols.contains(scalar) {
                return true
            } else if scalar.isEmojiMiscSymbol {
                return true
            }
        }

        return false
    }
}