Swift - 用空格替换字符串中的表情符号

extension String {
  func stringByRemovingEmoji() -> String {
    return String(self.filter { !$0.isEmoji() })
  }
}

extension Character {
  fileprivate func isEmoji() -> Bool {
    return Character(UnicodeScalar(UInt32(0x1d000))!) <= self && self <= Character(UnicodeScalar(UInt32(0x1f77f))!)
      || Character(UnicodeScalar(UInt32(0x2100))!) <= self && self <= Character(UnicodeScalar(UInt32(0x26ff))!)
  }
}