                 let swiftRange = Range(nsRange, in: textField.text!)
                 let allowedText = textField.text!.qmui_substringAvoidBreakingUpCharacterSequencesWithRange(range: swiftRange!, lessValue: true, countingNonASCIICharacterAsTwo: shouldCountingNonASCIICharacterAsTwo)
                 textField.text = allowedText
-                
+
                 if originalDelegate?.responds(to: #selector(QMUITextFieldDelegate.textField(_:didPreventTextChangeInRange:replacementString:))) ?? false && textField.qmui_selectedRange() != nil {
                     originalDelegate!.textField!(textField, didPreventTextChangeInRange: textField.qmui_selectedRange()!, replacementString: nil)
                 }
             }
         }
     }
-    
+
     func fireTextDidChangeEvent(forTextField textField: QMUITextField) {
-        textField .sendActions(for: .editingChanged)
+        textField.sendActions(for: .editingChanged)
         NotificationCenter.default.post(name: NSNotification.Name.UITextFieldTextDidChange, object: textField)
     }
-    
+
     private func lengthWithString(_ string: String) -> UInt {
         return UInt(shouldCountingNonASCIICharacterAsTwo ? string.qmui_lengthWhenCountingNonASCIICharacterAsTwo : string.length)
     }
-    
+
     // MARK: QMUITextFieldDelegate
+
     func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
-        
+
         if let textField = textField as? QMUITextField {
             if textField.maximumTextLength < UInt.max {
                 // 如果是中文输入法正在输入拼音的过程中（markedTextRange 不为 nil），是不应该限制字数的（例如输入“huang”这5个字符，其实只是为了输入“黄”这一个字符），所以在 shouldChange 这里不会限制，而是放在 didChange 那里限制。
-                
+
                 let isDeleting = range.length > 0 && string.length <= 0
                 if isDeleting || (textField.markedTextRange != nil) {
                     if textField.originalDelegate?.responds(to: #function) ?? false {

            //            }
        }
    }
    
    /**
     *  在使用 maximumTextLength 功能的时候，是否应该把文字长度按照 NSString (QMUI) qmui_lengthWhenCountingNonASCIICharacterAsTwo(_:) 的方法来计算。
     *  默认为 false。

            }
        }
    }

    public override var placeholder: String? {
        didSet {
            updateAttributedPlaceholderIfNeeded()
        }
    }

    override var text: String? {
        get {
            return super.text
