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I used to be able to generate NSAttributedStrings and set a UITextView's typingAttributes using the same attribute dictionary (most especially the same keys) of type [String: Any]. Since iOS 11, I've had to change [String: Any] attributes to [NSAttributedStringKey: Any]attributes for generating NSAttributedStrings, yet UITextViews still remain of type [String: Any]. Why?

Aaron
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    FYI - this has nothing to do with Swift 4. The use of `NSAttributedStringKey` is change in the API as of iOS 11, etc. It's the same whether you use Swift 4, Swift 3, or Objective-C. – rmaddy Oct 20 '17 at 00:28
  • Weird, the compile-time warnings only popped up after I converted from Swift 3.2 to Swift 4 in Xcode 9 – Aaron Oct 20 '17 at 01:28
  • Doesn't seem to be unified for me as well. – Jakub Truhlář Feb 21 '18 at 10:27

1 Answers1

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Not sure why it's not [NSAttributedStringKey: Any] as well but nonetheless you can just convert it like so 

func ConvertToTypingAttributes(_ attr: [NSAttributedStringKey: Any]) -> [String: Any] {
    var result = [String: Any]()
    for (k,v) in attr {
        result[k.rawValue] = v
    }
    return result
}

USAGE: 

var txtView = UITextView()
let p: [NSAttributedStringKey: Any] = [NSAttributedStringKey.backgroundColor: UIColor.green]
txtView.typingAttributes = ConvertToTypingAttributes(p)
TNguyen
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  • Thanks, but my question wasn't asking for a way to convert it, rather an explanation. – Aaron Oct 19 '17 at 23:41
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    Since the question isn't asking for a conversion, I won't add this as an answer. Here is another option: `extension Dictionary where Key == NSAttributedStringKey { func asTypingAttributes() -> [String: Any] { var result = [String: Any]() for (key, value) in self { result[key.rawValue] = value } return result } }` – Ben Packard Oct 20 '17 at 16:31