Type of expression is ambiguous without more conte

问题:

i am implementing pod 'Socket.IO-Client-Swift'

but in SocketEngine.swift file i'm getting this error.

 private func handleBase64(message: String) {
            // binary in base64 string
            let noPrefix = message[message.index(message.startIndex, offsetBy: 2)..<message.endIndex]

            if let data = Data(base64Encoded: noPrefix, options: .ignoreUnknownCharacters) {
                client?.parseEngineBinaryData(data)
            }
        }

thanks in advance!!

回答1:

noPrefix is of type Substring, just coerce it to String:

if let data: Data = Data(base64Encoded: String(noPrefix), options: .ignoreUnknownCharacters) {
    ...
}