Schwifty

gistfile1.txt

class FileWriter {
  func writeDocument(text: String?, completion((Bool, NSError?) -> Void)?) -> NSError? {
       var error: NSError?
       if let cText = text {
           dispatch_async(myQueue) {() -> Void in 
               let error = writeAndSaveFile(cText)
               completion?((error == nil), error)
           }
       } else {
           error = NSError.dataEmptyError()
       }
       return error
  }
}


class Foo {
    func userDidTypeText(text: String?) {
        if let error = FileWriter().writeDocument(text) {(success, writeError) in
            // Stop loading indicator
            // Show alert with writeError
        } {
            // Show alert with error
        } else {
            // Start loading indicator
        }
    }
}