encodedOffset deprecation

Question

In my application I have some code to fetch the range of the host in a URL. It looks like this:

private func rangeOfHost(text: String) -> NSRange? {
    let url = URL(string: text)
    if let host: String = url?.host {
        if let range = text.range(of: host) {
            return NSRange(location: range.lowerBound.encodedOffset,
                           length: range.upperBound.encodedOffset - range.lowerBound.encodedOffset)
        }
    }

    return nil
}

Xcode has been warning me that 'encodedOffset' is deprecated: encodedOffset has been deprecated as most common usage is incorrect. Use utf16Offset(in:) to achieve the same behavior.. However, it's not clear to me how I can replace those encodedOffsets with this suggestions. Any ideas?

Answer 1

A simple and correct way to create an NSRange from a Range<String.Index> is to use its initializer:

public init<R, S>(_ region: R, in target: S) where R : RangeExpression, S : StringProtocol, R.Bound == String.Index

In your case:

if let range = text.range(of: host) {
    return NSRange(range, in: text)
}

Answer 2

yourString1.yourIndex.utf16Offset(in: yourString2)