Swift version: 5.2
Swift has a dedicated
Substring type (
String.SubSequence) that is designed to hold slices of strings, which is a performance optimization: when you store part of a string in a different variable, Swift can simply point the substring at the parent string rather than copy all the data.
However, while substrings can be used in many of the same ways as regular strings, they aren’t the same – if you have a function that accepts a
String as a parameter, you simply cannot send it a
To fix this, you can wrap your substring in a
String initializer like this:
let quote = "The revolution will be Swift" let substring = quote.dropFirst(23) let realString = String(substring)
SPONSORED Would you describe yourself as knowledgeable, but struggling when you have to come up with your own code? Fernando Olivares has a new book containing iOS rules you can immediately apply to your coding habits to see dramatic improvements, while also teaching applied programming fundamentals seen in refactored code from published apps.
Available from iOS 8.0
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
Link copied to your pasteboard.