QT settext限制字数

您可以使用以下代码来限制QTextEdit的文本长度：

void Test::slot_limitTextEditTextCount(QTextEdit* text_edit, const int& limit_count) {
QString text = text_edit->toPlainText();
int count = text.count();
if (count > limit_count) {
int position = text_edit->textCursor().position();
QTextCursor text_cursor = text_edit->textCursor();
text.remove(position - (count - limit_count), count - limit_count);
text_edit->setText(text);
text_cursor.setPosition(position - (count - limit_count));
text_edit->setTextCursor(text_cursor);
}
}

在您的代码中，连接textChanged信号到槽函数slot_limitTextEditTextCount：

QTextEdit* text_edit = new QTextEdit(this);
connect(text_edit, &QTextEdit::textChanged, this, &Test::slot_limitTextEditTextCount);

在槽函数slot_limitTextEditTextCount中，获取文本内容的长度并进行判断。如果超出了限制的字数，截取文本内容并设置光标位置：

void Test::slot_limitTextEditTextCount() {
QTextEdit* text_edit = static_cast<QTextEdit*>(sender());
QString text = text_edit->toPlainText();
int currentNum = text.length();
if (currentNum > m_maxWordNum) {
text = text.mid(0, m_maxWordNum);
int position = text_edit->textCursor().position();
text_edit->setText(text);
QTextCursor cursor = text_edit->textCursor();
if (position > m_maxWordNum) {
position = m_maxWordNum;
}
cursor.setPosition(position);
text_edit->setTextCursor(cursor);
currentNum = m_maxWordNum;
}
ui->labelCurrentNum->setNum(currentNum);
}

这样，当文本超过限制的字数时，会自动截取文本内容并设置光标位置，同时更新显示当前字数的标签。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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