lineEdit.setPlaceholderText()
时间: 2023-06-21 15:15:18 浏览: 74
`lineEdit.setPlaceholderText()` 是一个函数,它可以设置 QLineEdit 组件的占位文本。当用户未输入任何内容时,该文本将显示在 QLineEdit 中。例如,以下代码将 QLineEdit 的占位文本设置为“请输入用户名”:
```python
lineEdit = QLineEdit()
lineEdit.setPlaceholderText("请输入用户名")
```
相关问题
用pyqt5写一个实现点击任意lineedit弹出osk.exe虚拟键盘,点击其他部分隐藏键盘的程序
可以使用以下代码实现:
```python
import sys
from PyQt5.QtWidgets import QApplication, QWidget, QLineEdit
from PyQt5.QtCore import QProcess
class MyWidget(QWidget):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
self.setGeometry(300, 300, 300, 200)
self.setWindowTitle('Virtual Keyboard')
self.lineedit = QLineEdit(self)
self.lineedit.setGeometry(50, 50, 200, 30)
self.lineedit.setPlaceholderText('Click here to input')
self.process = QProcess(self)
self.lineedit.clicked.connect(self.showKeyboard)
self.lineedit.editingFinished.connect(self.hideKeyboard)
def showKeyboard(self):
self.process.start('osk.exe')
def hideKeyboard(self):
self.process.kill()
if __name__ == '__main__':
app = QApplication(sys.argv)
widget = MyWidget()
widget.show()
sys.exit(app.exec_())
```
当点击任意 `QLineEdit` 时,会弹出虚拟键盘 `osk.exe`。当点击其他部分时,虚拟键盘会隐藏。
用pyqt5写一个实现点击lineedit弹出osk.exe虚拟键盘,点击其他控件隐藏键盘的程序
可以使用以下代码实现:
```python
import os
from PyQt5.QtWidgets import QApplication, QLineEdit, QWidget, QVBoxLayout, QPushButton
class MainWindow(QWidget):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
self.setWindowTitle('Virtual Keyboard')
self.setGeometry(100, 100, 300, 200)
vbox = QVBoxLayout()
self.lineedit = QLineEdit()
self.lineedit.setPlaceholderText('Click here to show virtual keyboard')
self.lineedit.setFocusPolicy(1)
self.lineedit.mousePressEvent = self.show_keyboard
vbox.addWidget(self.lineedit)
self.button = QPushButton('Hide Keyboard')
self.button.clicked.connect(self.hide_keyboard)
vbox.addWidget(self.button)
self.setLayout(vbox)
def show_keyboard(self, event):
os.system('osk.exe')
def hide_keyboard(self):
os.system('taskkill /IM osk.exe')
if __name__ == '__main__':
app = QApplication([])
window = MainWindow()
window.show()
app.exec_()
```
当用户点击 `QLineEdit` 控件时,会调用 `show_keyboard` 方法,该方法会打开虚拟键盘。当用户点击 `QPushButton` 控件时,会调用 `hide_keyboard` 方法,该方法会关闭虚拟键盘。