pyside6 如何单独修改plaintextedit内指定字体的颜色，其余的文本不变

在PySide6中，你可以使用QTextCursor来操作QPlainTextEdit中的文本，并单独修改指定文本的颜色。以下是一个示例代码，展示了如何实现这一功能： ```python from PySide6.QtWidgets import QApplication, QPlainTextEdit, QTextEdit, QPushButton, QVBoxLayout, QWidget from PySide6.QtGui import QTextCursor, QTextCharFormat, QColor from PySide6.QtCore import Qt class TextEditor(QWidget): def __init__(self): super().__init__() self.plain_text_edit = QPlainTextEdit() self.plain_text_edit.setPlainText("This is a sample text. We will change the color of the word 'sample'.") self.change_color_button = QPushButton("Change Color") self.change_color_button.clicked.connect(self.change_color) layout = QVBoxLayout() layout.addWidget(self.plain_text_edit) layout.addWidget(self.change_color_button) self.setLayout(layout) def change_color(self): text_to_change = "sample" text = self.plain_text_edit.toPlainText() cursor = self.plain_text_edit.textCursor() format = QTextCharFormat() format.setForeground(QColor("red")) index = text.find(text_to_change) if index >= 0: cursor.setPosition(index) cursor.movePosition(QTextCursor.Right, QTextCursor.KeepAnchor, len(text_to_change)) cursor.setCharFormat(format) if __name__ == "__main__": app = QApplication([]) editor = TextEditor() editor.show() app.exec() ``` 在这个示例中，我们创建了一个QPlainTextEdit和一个QPushButton。当点击按钮时，`change_color`方法会被调用。该方法会查找文本中指定的部分（在这个例子中是"sample"），并将其颜色更改为红色。