pyqt5 / qtdesigner 文本框默认标签

Question

我正在尝试为我的 python 程序创建一个 GUI。我需要的工具之一是文本输入框。

现在，我想要这个框的文本标签，上面写着 "Please insert texts." 是否有添加标签的功能，该标签默认显示在输入文本框内，并在用户单击框输入时消失？

我不介意使用qt designer 或pyqt5 coding。

谢谢大家。

Answer 1

placeholderText : QString 此属性包含行编辑的占位符文本

import sys
from PyQt5.QtWidgets import QLineEdit, QVBoxLayout, QApplication, QWidget

class Test(QWidget):
    def __init__(self):
        super().__init__()

        self.lineEdit = QLineEdit(placeholderText="Please insert texts.")  # <---

        vbox = QVBoxLayout(self)
        vbox.addWidget(self.lineEdit)

if __name__ == '__main__':
    app  = QApplication(sys.argv)
    w = Test()
    w.show()
    sys.exit(app.exec_())

Answer 2

我和你一样是初学者，我的英语不是很好。但我建议您使用 Qt Designer。绘制应用程序更容易、更快速。我正在使用 pyside2 项目并建议您阅读要在 PySide2 项目和 Qt 项目中使用的每个小部件的文档。试试下面的代码

enter image description here

import sys
from PySide2.QtWidgets import QApplication
from PySide2.QtWidgets import QDialog
from PySide2.QtWidgets import QTextEdit
from PySide2.QtWidgets import QVBoxLayout
from PySide2.QtCore import Qt


class MainDialog(QDialog):
    def __init__(self, parent=None):
        super(MainDialog, self).__init__(parent)

        # Create Widget TextEdit
        self.text = QTextEdit()

        # I think that you wanna this function in your program
        # https://doc.qt.io/qtforpython/PySide2/QtWidgets/QLineEdit.html?highlight=qlineedit#PySide2.QtWidgets.PySide2.QtWidgets.QLineEdit.setPlaceholderText
        # http://doc.qt.io/qt-5/qlineedit.html#placeholderText-prop
        self.text.setPlaceholderText('''Yes! this is exactly what I want!
        Thank you, what if you have a big text box (more than 10 lines) and
        you want to scale up the place holder and align it in center?? ''')

        # https://doc.qt.io/qtforpython/PySide2/QtWidgets/QLineEdit.html?highlight=qlineedit#PySide2.QtWidgets.PySide2.QtWidgets.QLineEdit.setAlignment
        # http://doc.qt.io/qt-5/qlineedit.html#alignment-prop
        self.text.setAlignment(Qt.AlignCenter)

        # Layout
        layout = QVBoxLayout()
        layout.addWidget(self.text)
        self.setLayout(layout)


def main():

    app = QApplication()
    mainDialog = MainDialog()
    mainDialog.show()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()

pyqt5 / qtdesigner 文本框默认标签

pyqt5 / qtdesigner textbox default label

python

textbox

pyqt5