QT connect()函數使用

QT學習

connect()語句：

connect(sender,SIGNAL(signal()),receiver,SLOT(slot()));

sender:你操作的控件或按鈕

signal():你的動作，例如點擊鼠標左鍵是clicked()

slot():動作調用的函數函數在該類的private slots:下

軟鍵盤的輸入效果

添加以下代碼 

#include <QSignalMapper>

QSignalMapper *m = new QSignalMapper(this);
connect(m, SIGNAL(mapped(int)), this, SLOT(addchar(int)));
connect(ui.pushButton_0, SIGNAL(clicked()), m, SLOT(map()));
connect(ui.pushButton_1, SIGNAL(clicked()), m, SLOT(map()));
connect(ui.pushButton_2, SIGNAL(clicked()), m, SLOT(map()));
connect(ui.pushButton_3, SIGNAL(clicked()), m, SLOT(map()));
connect(ui.pushButton_4, SIGNAL(clicked()), m, SLOT(map()));
connect(ui.pushButton_5, SIGNAL(clicked()), m, SLOT(map()));
connect(ui.pushButton_6, SIGNAL(clicked()), m, SLOT(map()));
connect(ui.pushButton_7, SIGNAL(clicked()), m, SLOT(map()));
connect(ui.pushButton_8, SIGNAL(clicked()), m, SLOT(map()));
connect(ui.pushButton_9, SIGNAL(clicked()), m, SLOT(map()));
connect(ui.point, SIGNAL(clicked()), m, SLOT(map()));
m->setMapping(ui.pushButton_0, 0);
m->setMapping(ui.pushButton_1, 1);
m->setMapping(ui.pushButton_2, 2);
m->setMapping(ui.pushButton_3, 3);
m->setMapping(ui.pushButton_4, 4);
m->setMapping(ui.pushButton_5, 5);
m->setMapping(ui.pushButton_6, 6);
m->setMapping(ui.pushButton_7, 7);
m->setMapping(ui.pushButton_8, 8);
m->setMapping(ui.pushButton_9, 9);
m->setMapping(ui.point, 10);

 

Qlabel控件

label->setText(Qstring)設置label控件的顯示的文本

label->show()顯示該控件