主页 / 问题 / 1599967
Accepted
Nevskiy
Asked:2024-11-16 22:30:38 +0000 UTC2024-11-16 22:30:38 +0000 UTC

如何使用 QLineEdit 中的数据更新 QLabel？

  • 772

如何在 中输入数字后QLineEdit，将该数字插入到 中QLabel，并在输出之前QLabel将该数字与值相加10？
例如输入QLineEdit- 5，QLabel输出 - 15。

主要.py：

import sys
from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import (QApplication, QWidget, QPushButton, QLabel, QVBoxLayout, QLineEdit)

class MyWidget(QWidget):
    def __init__(self):
        QWidget.__init__(self)
        self.my_label = QLabel()
        self.line_edit = QLineEdit()
        self.layout = QVBoxLayout()
        self.layout.addWidget(self.my_label)
        self.layout.addWidget(self.line_edit)
        self.setLayout(self.layout)
        self.line_edit.textChanged.connect(self.magic)

    def magic(self):
        self.A = 10
        self.my_label.setText(self.line_edit.text())

if __name__ == "__main__":
    app = QApplication(sys.argv)
    widget = MyWidget()
    widget.resize(200, 150)
    widget.show()
    sys.exit(app.exec())
python

1 个回答

  1. Best Answer

    void QLabel:: setNum (int num)

    将内容设置label为包含整数文本表示形式的纯文本。任何以前的内容都将被删除。

    import sys
from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import (QApplication, QWidget, QLabel, 
    QPushButton, QVBoxLayout, QLineEdit, QMessageBox)
        

class MyWidget(QWidget):
    def __init__(self):
        super().__init__()
        
        self.certain_number = 10
        
        self.my_label = QLabel()
        self.my_label.setAlignment(Qt.AlignCenter)
        self.my_label.setStyleSheet(
            "color: #1E5F74; font: 20pt;")
        self.line_edit = QLineEdit()
        self.line_edit.textChanged.connect(self.magic)
        
        self.layout = QVBoxLayout(self)
        self.layout.addWidget(self.my_label)
        self.layout.addWidget(self.line_edit)

# +++ vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
    def magic(self, text):
        try:
            number = int(text)
            self.my_label.setNum(number + self.certain_number)
        except Exception as e:
            msg = QMessageBox.information(
                self, 
                'Внимание', 
                'Проверьте ввод данных. \nВведите число.')
            return
# +++ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

        
if __name__ == "__main__":
    app = QApplication(sys.argv)
    widget = MyWidget()
    widget.resize(600, 300)
    widget.show()
    sys.exit(app.exec())

    在此输入图像描述

    • 1

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