PyQt5 QLineEdit(单行编辑器) 学习

QLineEdit is a widget that allows to enter and edit a single line of plain text. There are undo and redo, cut and paste, and drag & drop functions available for the widget.

代码：

# coding='utf-8'

from PyQt5.QtWidgets import QApplication, QWidget,\
    QLineEdit, QLabel
import sys


class Gui(QWidget):
    def __init__(self):
        super(Gui, self).__init__()
        self.start()

    def start(self):
        # 创建基于主窗体的标签
        self.label = QLabel(self)
        self.label.move(60, 40)

        # 创建基于主窗体的单行输入框
        line_edit = QLineEdit(self)
        line_edit.move(60, 100)

        # 将单行输入框的文本改变信号与self.on_changed槽联系起来
        line_edit.textChanged[str].connect(self.on_changed)

        self.setGeometry(300, 300, 280, 170)
        self.setWindowTitle('单行输入框')
        self.show()

    # 每当单行输入控件的内容改变时触发
    def on_changed(self, text):
        # 每当单行输入控件的内容改变时就将该\
        #       单行输入剩余的内容写入label
        self.label.setText(text)
        # label的adjustSize方法可以\
        #   根据label里面文本的长度动态调整label控件的长度
        self.label.adjustSize()


app = QApplication(sys.argv)
gui = Gui()
sys.exit(app.exec_())