呵呵, 去年的帖子了,
我是新手, 正在处理一个 TextEdit 选择文本的功能, Google 到这里~
正如 qindq 所说, Qt API 手册中这样描述 textCursor();
Returns a copy of the QTextCursor that represents the currently visible cursor. Note that changes on the returned cursor do not affect QTextEdit's cursor; use setTextCursor() to update the visible cursor.