如何删除迭代创建的 QLabel？

Question

我正在制作一个应用程序，我正在迭代创建 QLabel。我正在尝试使用另一个按钮删除它们。

我想删除 'history'。我已经尝试过不同的东西，比如 label.remove() 等等，但是在这里添加我以前的尝试没有任何价值（而且我的尝试不在 this 可重现的例子中）。

这是我的代码：

from PyQt5.QtWidgets import *
import sys

class MainWindow(QMainWindow):

    def __init__(self, *args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)
        self.left = 10
        self.top = 10
        self.width = 400
        self.height = 75
        self.initUI()

        self.layout = QVBoxLayout()

        self.line = QLineEdit()
        label = QLabel('Enter a WORD:')

        run_button = QPushButton('Run')
        reset_button = QPushButton('Reset History')

        self.layout.addWidget(label)
        self.layout.addWidget(self.line)
        self.layout.addWidget(run_button)
        self.layout.addWidget(reset_button)

        widget = QWidget()
        widget.setLayout(self.layout)

        run_button.clicked.connect(self.on_click)

        self.setCentralWidget(widget)

    def initUI(self):
        self.setGeometry(self.left, self.top, self.width, self.height)

    def on_click(self):
        response = QLabel(self.line.text())

        self.layout.addWidget(response)
        self.line.selectAll()


app = QApplication(sys.argv)

window = MainWindow()
window.show()

app.exec_()

Answer 1

您必须存储 QLabel，以便稍后将它们从布局中删除并删除，然后另外重新计算 window 的大小：

class MainWindow(QMainWindow):
    def __init__(self, *args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)
        self.left = 10
        self.top = 10
        self.width = 400
        self.height = 75
        self.initUI()

        self.layout = QVBoxLayout()

        self.line = QLineEdit()
        label = QLabel("Enter a WORD:")

        run_button = QPushButton("Run")
        reset_button = QPushButton("Reset History")

        self.layout.addWidget(label)
        self.layout.addWidget(self.line)
        self.layout.addWidget(run_button)
        self.layout.addWidget(reset_button)

        widget = QWidget()
        widget.setLayout(self.layout)

        run_button.clicked.connect(self.add_history)
        reset_button.clicked.connect(self.delete_history)

        self.setCentralWidget(widget)

        self._history_labels = []

    def initUI(self):
        self.setGeometry(self.left, self.top, self.width, self.height)

    def add_history(self):
        history = QLabel(self.line.text())
        self.layout.addWidget(history)
        self.line.selectAll()

        self._history_labels.append(history)

    def delete_history(self):
        for history in self._history_labels:
            self.layout.removeWidget(history)
            history.deleteLater()
        self._history_labels = []
        width = self.size().width()
        self.adjustSize()
        height = self.sizeHint().height()
        QTimer.singleShot(0, lambda: self.resize(width, height))

Answer 2

对我来说，使用一个标签来存储您的所有回复会更容易。每次点击“运行”按钮时，在标签中添加一个新行。用 # <---

突出显示的更改行

from PyQt5.QtWidgets import *
import sys

class MainWindow(QMainWindow):

    def __init__(self, *args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)
        self.left = 10
        self.top = 10
        self.width = 400
        self.height = 75
        self.initUI()

        self.layout = QVBoxLayout()

        self.line = QLineEdit()
        label = QLabel('Enter a WORD:')

        run_button = QPushButton('Run')
        reset_button = QPushButton('Reset History')
        
        self.label = QLabel()               # <-----

        self.layout.addWidget(label)
        self.layout.addWidget(self.line)
        self.layout.addWidget(run_button)
        self.layout.addWidget(reset_button)
        self.layout.addWidget(self.label)   # <-----

        widget = QWidget()
        widget.setLayout(self.layout)

        run_button.clicked.connect(self.on_click)
        reset_button.clicked.connect(self.reset_click) # <-----

        self.setCentralWidget(widget)

    def initUI(self):
        self.setGeometry(self.left, self.top, self.width, self.height)

    def on_click(self):
        self.label.setText(self.label.text() + '\n' + self.line.text())  # <-----

        self.line.selectAll()

    def reset_click(self):       # <-----
        self.label.setText('')   # <-----

app = QApplication(sys.argv)

window = MainWindow()
window.show()

app.exec_()

        self.layout = QVBoxLayout()

        self.line = QLineEdit()
        label = QLabel('Enter a WORD:')

        run_button = QPushButton('Run')
        reset_button = QPushButton('Reset History')
        
        self.label = QLabel()               # <-----

        self.layout.addWidget(label)
        self.layout.addWidget(self.line)
        self.layout.addWidget(run_button)
        self.layout.addWidget(reset_button)
        self.layout.addWidget(self.label)   # <-----

        widget = QWidget()
        widget.setLayout(self.layout)

        run_button.clicked.connect(self.on_click)
        reset_button.clicked.connect(self.reset_click) # <-----

        self.setCentralWidget(widget)

    def initUI(self):
        self.setGeometry(self.left, self.top, self.width, self.height)

    def on_click(self):
        self.label.setText(self.label.text() + '\n' + self.line.text()) # <-----

        self.line.selectAll()

    def reset_click(self):        # <-----
        self.label.setText('')    # <-----

app = QApplication(sys.argv)

window = MainWindow()
window.show()

app.exec_()

如何删除迭代创建的 QLabel？

How do I remove QLabels created iteratively?

python

pyqt

pyqt5