問題描述

我的項目中有一個 QLineEdit.我想在 lineEdit 上使用 QValidation.

I have a QLineEdit in my project. I want to use the QValidation on lineEdit.

#Create lineEdit
itemValue = QtWidgets.QLineEdit()
#Create валидатор
objValidator = QtGui.QDoubleValidator(self)
#setup range
objValidator.setRange(-10.0, 100.0, 5)
#lineEdit with validation
itemValue.setValidator(objValidator)

但效果不好.我可以輸入我想要的，除了符號.而且范圍不起作用！我可以輸入 100500 或 -100500，但我希望，該用戶只能輸入范圍內的數字.

But it doesn't work well.I can type what i want, except symbols. And range doesn't work!I can type 100500 or -100500, but i want, that user can enter numbers only in range.

我應該如何使用范圍?我需要幫助:)

How i should use range? I need help:)

謝謝你們的幫助，伙計們！

Thanks for your help, guys!

推薦答案

默認情況下，驗證器不會阻止輸入超出范圍的值，如果輸入的值也不會阻止用戶離開行編輯是無效或中間.

By default, a validator will not prevent values outside the range from being entered, and it won't prevent the user leaving the line-edit if the entered value is Invalid or Intermediate.

但是，它確實讓您有機會以編程方式拒絕輸入，因為只要當前值不可接受，行編輯就不會發出它的 editingFinished 或 returnPressed 信號，及其 hasAcceptableInput 方法將返回 False.另外，如果你子類化驗證器，你可以重新實現它的 fixup 方法來控制輸入的值.

However, it does give you an opportunity to reject the input programmatically, because whenever the current value is unacceptable, the line-edit won't emit its editingFinished or returnPressed signals, and its hasAcceptableInput method will return False. In addition, if you subclass the validator, you can reimplement its fixup method to control the values that are entered.

然而，正如已經建議的那樣，更好/更簡單的解決方案是使用 QDoubleSpinBox，因為它會自動清理輸入并提供更友好的用戶界面.

However, as has been suggested already, a far better/simpler solution is to use a QDoubleSpinBox, since it cleans up the input automatically and provides a more user-friendly interface.

這篇關于PyQt QLineEdit 與 QValidator的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！