QLineEdit自定义

1.QAction

void addAction(QAction * action, ActionPosition position) 
QLineEdit::LeadingPosition//前面
QLineEdit::TrailingPosition//后面

2.自定义

QMargins margins=ui->lineEdit_3->textMargins();
tipLbl=new QLabel("密码正确",this);
ui->lineEdit_3->setTextMargins(margins.left(),margins.top(),tipLbl->width(),margins.bottom());//避免与文字重叠，需调整。
QHBoxLayout *layOut=new QHBoxLayout;
layOut->addStretch();
layOut->addWidget(tipLbl);
layOut->setSpacing(0);
layOut->setContentsMargins(0,0,0,0);
ui->lineEdit_3->setLayout(layOut);