从iOS的键盘输入的String值的编码是什么？

Question

I have the following code:

let range = NSRange(location: 0, length: mutableAttributedString.string.lengthOfBytes(using: String.Encoding))
mutableAttributedString.addAttribute(NSAttributedString.Key.font, value: UIFont.preferredFont(forTextStyle: UIFont.TextStyle.body), range: range)

I need to know what string encoding to use where it says "String.Encoding" for the parameter "using" in the first line of the code above. The String object would always originate from the iOS keyboard.

Answer 1

If you are looking to create an NSRange to be used to add attributes, I don't believe lengthOfBytes is what you're looking for. Here a range represents a substring within your original mutableAttributedString , if you are simply looking to add an attribute to the whole string, your range should be defined as:

let range = NSRange(location: 0, length: mutableAttributedString.string.count)

I'm otherwise not sure what you'd be using lengthOfBytes for, but I don't think that'll work for adding attributes as you seem to be doing here.