UITextField

• 計算字數

  • 在 shouldChangeCharactersIn 內計算

  • func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
    
        let count = (textField.text?.characters.count)! + string.characters.count - range.length
        self.showWords(count: self.maxTitleCount - count)
    
        if (self.maxTitleCount - count) < 0 {
            self.postButton?.isEnabled = false
        } else { self.postButton?.isEnabled = true }
    
        return true
    }
    

• 讓按下return鍵的時候，取消鍵盤

• func textFieldShouldReturn(_ textField: UITextField) -> Bool {
  
      if(text == "\n") {
          textView.endEditing(true)
          return false
      }
      return false
  }