1. setPlainText(QString text)设置控件内的纯文本会清空原内容。示例plainTextEdit-setPlainText(这是纯文本内容);2. appendPlainText(QString text)在末尾追加一行文本自动换行。示例plainTextEdit-appendPlainText(追加一行日志信息);3. insertPlainText(QString text)在当前光标位置插入纯文本。示例plainTextEdit-insertPlainText(插入内容);4. toPlainText()获取控件中的纯文本内容。示例QString text plainTextEdit-toPlainText();5. clear()清空整个文本内容。示例plainTextEdit-clear();6. setReadOnly(bool enabled)设置是否只读。示例plainTextEdit-setReadOnly(true);7. setPlaceholderText(QString text)设置占位提示文字。示例plainTextEdit-setPlaceholderText(请输入多行文本...);8. copy()复制选中的文本到剪贴板。示例plainTextEdit-copy();9. cut()剪切选中文本。示例plainTextEdit-cut();10. paste()从剪贴板粘贴文本到当前光标位置。示例plainTextEdit-paste();11. undo() / redo()撤销与重做操作。示例plainTextEdit-undo();plainTextEdit-redo();12. selectAll()全选所有文本。示例plainTextEdit-selectAll();13. setFont(QFont font)设置显示文字的字体。示例plainTextEdit-setFont(QFont(Consolas,12));14. zoomIn(int range 1) / zoomOut(int range 1)放大、缩小文字大小。示例plainTextEdit-zoomIn(2);//放大两级plainTextEdit-zoomOut(1);//缩小一级15. moveCursor(QTextCursor::MoveOperation op)移动文本光标如移动到末尾。示例plainTextEdit-moveCursor(QTextCursor::End);16. textCursor()获取文本光标对象用于高级编辑。示例QTextCursor cursor plainTextEdit-textCursor();cursor.movePosition(QTextCursor::Start);plainTextEdit-setTextCursor(cursor);17. setTextCursor(const QTextCursor cursor)设置当前光标位置。示例QTextCursor cursor plainTextEdit-textCursor();cursor.movePosition(QTextCursor::End);plainTextEdit-setTextCursor(cursor);部分内容省略了课程内容有完整的详细教程。计算机技术课程https://blog.csdn.net/2301_76542477/article/details/149032632?spm1011.2415.3001.5331