PyQt5学习5-行编辑

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QLineEdit

QLineEdit编辑一行的字符

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#!/usr/bin/python3
#-*- coding: utf-8 -*-
import sys
from PyQt5.QtWidgets import QWidget,QApplication, QHBoxLayout, QLabel, QLineEdit, QPushButton, QMessageBox
class ex(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()
    def initUI(self):
        vbox = QHBoxLayout()
        lb = QLabel('Enter you name')
        self.le = QLineEdit()
        bt = QPushButton('Hello')
        bt.clicked.connect(self.hello)
        vbox.addWidget(lb)
        vbox.addWidget(self.le)
        vbox.addWidget(bt)
        self.setLayout(vbox)
        self.setWindowTitle('Hello')
        self.resize(400,300)
        self.show()
    def hello(self):
        QMessageBox.information(self,'Information','Hello '+ self.le.text())
if __name__ == '__main__':
    app = QApplication(sys.argv)
    e = ex()
    sys.exit(app.exec_())

该程序产生如下窗口

QLineEdit-1

在QLineEdit框中输入字符后，点击 Hello, 出现一个信息框

QLineEdit-2

QLabel

QLabel 显示图片或字符。

QComboBox

QComboBox是下拉列表框，通过下拉列表选取需要的选项。

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#!/usr/bin/python3
#-*- coding: utf-8 -*-
import sys
from PyQt5.QtWidgets import QWidget,QApplication, QGridLayout, QLabel, QLineEdit, QComboBox
class ex(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()
    def initUI(self):
        grid = QGridLayout()
        self.setLayout(grid)
        self.lb = QLabel('System')
        self.le = QLineEdit()
        combo = QComboBox(self)
        combo.addItem('Windows')
        combo.addItem('MacOS')
        combo.addItem('Linux')
        combo.activated[str].connect(self.onActivated)
        grid.addWidget(self.lb,0,0)
        grid.addWidget(combo,0,1)
        grid.addWidget(self.le,1,0,1,2)
        self.setWindowTitle('combo')
        self.show()
    def onActivated(self,text):
        self.le.setText(text)
if __name__ == '__main__':
    app = QApplication(sys.argv)
    e = ex()
    sys.exit(app.exec_())

该程序产生一个窗口如下

w3

通过下拉列表选择系统，并在QLineEdit中显示所选的内容。