Swift 4 Conversion error – NSAttributedStringKey: Any

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Why you got this error

Previously, your attributes is defined as [String: Any], where the key comes from NSAttributedStringKey as a string or NSAttributedString.Key in Swift 4.2

During the migration, the compiler tries to keep the [String: Any] type. However, NSAttributedStringKey becomes a struct in swift 4. So the compiler tries to change that to string by getting its raw value.

In this case, setTitleTextAttributes is looking for [NSAttributedStringKey: Any] but you provided [String: Any]

To fix this error:

Remove .rawValue and cast your attributes as [NSAttributedStringKey: Any]

Namely, change this following line

let attributes = [NSAttributedStringKey.font.rawValue:
    UIFont(name: "Helvetica-Bold", size: 15.0)!, 
    NSAttributedStringKey.foregroundColor: UIColor.white] as! [String : Any]

to

let attributes = [NSAttributedStringKey.font:
    UIFont(name: "Helvetica-Bold", size: 15.0)!, 
    NSAttributedStringKey.foregroundColor: UIColor.white] as! [NSAttributedStringKey: Any]

And in Swift 4.2,

 let attributes = [NSAttributedString.Key.font:
    UIFont(name: "Helvetica-Bold", size: 15.0)!, 
    NSAttributedString.Key.foregroundColor: UIColor.white] as! [NSAttributedStringKey: Any]

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