What characters are allowed in a iOS file name?

Question

I\'m looking for a way to make sure a string can be used as a file name under iOS. I\'m currently in the section of the code that deletes incompatible characters. I\'m wonde

Answer 1

I find this to be cleaner and probably much more performant. This is based on Angel Naydenov's solution, but first constructing Character set with all invalid characters and then calling components(separatedBy:) just once.

Swift 3 & 4

var invalidCharacters = CharacterSet(charactersIn: ":/")
invalidCharacters.formUnion(.newlines)
invalidCharacters.formUnion(.illegalCharacters)
invalidCharacters.formUnion(.controlCharacters)

let newFilename = originalFilename
    .components(separatedBy: invalidCharacters)
    .joined(separator: "")

Swift 2

let invalidCharacters = NSMutableCharacterSet(charactersInString: ":/")
invalidCharacters.formUnionWithCharacterSet(NSCharacterSet.newlineCharacterSet())
invalidCharacters.formUnionWithCharacterSet(NSCharacterSet.illegalCharacterSet())
invalidCharacters.formUnionWithCharacterSet(NSCharacterSet.controlCharacterSet())

let filename = originalFilename
    .componentsSeparatedByCharactersInSet(invalidCharacters)
    .joinWithSeparator("")