控件之间设置伙伴关系
QLineEdit *nameEdit = new QLineEdit(this);
QLabel *nameLabel = new QLabel("&Name:", this);
nameLabel->setBuddy(nameEdit);
QLineEdit *phoneEdit = new QLineEdit(this);
QLabel *phoneLabel = new QLabel("&Phone:", this);
phoneLabel->setBuddy(phoneEdit);
标签文本设置带有&符号,设置伙伴关系后,用alt+N,alt+P都可以把鼠标焦点选中对应的控件nameEdit ,phoneEdit
设置伙伴关系也可以用界面拖拽设置