Swift equivalent to Objective-C FourCharCode single quote literals (e.g. 'TEXT')

Question

I am trying replicate some Objective C cocoa in Swift. All is good until I come across the following:

// Set a new type and creator:
unsigned long type = \'TEXT\         


        

Answer 1

Extend ExpressibleByStringLiteral to use four-character string literals directly:

extension FourCharCode: ExpressibleByStringLiteral {

    public init(stringLiteral value: StringLiteralType) {
        if let data = value.data(using: .macOSRoman), data.count == 4 {
            self = data.reduce(0, {$0 << 8 + Self($1)})
        } else {
            self = 0
        }
    }

}

Now you can just pass a string literal as the FourCharCode / OSType / UInt32 parameter:

let record = NSAppleEventDescriptor.record()
record.setDescriptor(NSAppleEventDescriptor(boolean: true), forKeyword: "test")