目录

1. 使用 append 方法:

2. 使用 setPlainText 方法

3.例子：

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1. 使用 append 方法:

如果你希望在 QTextEdit 控件上追加显示新的信息，可以使用 append 方法。例如，当你想要追加一行新的日志信息：

self.text_edit.append("This is a new log message")
 

2. 使用 setPlainText 方法

如果你希望设置或替换整个 QTextEdit 控件的文本内容，可以使用 setPlainText 方法：

self.text_edit.setPlainText("This is the new content replacing any existing content")
 

3.例子：

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QVBoxLayout, QWidget, QTextEdit, QPushButton, QHBoxLayout

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle("Text Display Example")

        self.text_edit = QTextEdit(self)
        self.text_edit.setReadOnly(True)

        # Create buttons
        self.append_button = QPushButton("Append Text", self)
        self.append_button.clicked.connect(self.append_text)

        self.set_text_button = QPushButton("Set Plain Text", self)
        self.set_text_button.clicked.connect(self.set_plain_text)

        # Create layout for buttons
        button_layout = QHBoxLayout()
        button_layout.addWidget(self.append_button)
        button_layout.addWidget(self.set_text_button)

        # Create main layout
        layout = QVBoxLayout()
        layout.addWidget(self.text_edit)
        layout.addLayout(button_layout)

        # Set the main layout to a central widget
        container = QWidget()
        container.setLayout(layout)
        self.setCentralWidget(container)

    def append_text(self):
        """ Append text to the QTextEdit """
        self.text_edit.append("Appended Text: This is a new line of text.")

    def set_plain_text(self):
        """ Set plain text to the QTextEdit """
        self.text_edit.setPlainText("Set Plain Text: This text replaces all existing text.")

# Main code to start the application
if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())