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

In Swift 4 or later, I use this code - if the string is not 4 characters in size, it will return an OSType(0):

extension String {
    public func osType() -> OSType {
       var result:UInt = 0

       if let data = self.data(using: .macOSRoman), data.count == 4
       {
            data.withUnsafeBytes { (ptr:UnsafePointer) in
                for i in 0.. "APPL" in ASCII