```c++
#include <iostream>
using namespace std;
class B{
public:
	int b=10;
	B();
};
B::B(){
	cout<<"输入b";
	cin>>b;
}
class A{
public:
	int a;
	A(B b_obj); // 添加B类型的参数
};
A::A(B b_obj){
	a = b_obj.b; // 访问B对象的数据成员b
	cout<<"构造"<<a;
}
int main(){
	B BB;
	A AA(BB); // 创建A对象时将B对象传递进去
}
```
```
--------
|输入b20
|构造20
--------
```

classB构造函数中得到的值给构造时的classA


![image.png](https://wiki.momen.world/static/img/f9e17da193d4ddb56001942fc64a889f.image.png)
`allCredentialsLayout->insertWidget(allCredentialsLayout->count() - 1, credentialWidget);`

qt在垂直布局插入一条widget到指定位置

解决方案
![image.png](https://wiki.momen.world/static/img/1716878bf1243d33c16dd821fc2e1556.image.png)

deepin fn快键失效

credentialWidget->setFixedSize(816, 53);

另外，你可以在循环结束后再加入QSpacerItem，这样可以确保弹簧位于所有密码条目的下方。修改后的代码如下：

QWidget *allCredentialsWidget=new QWidget(scrollArea);
QVBoxLayout *allCredentialsLayout=new QVBoxLayout(allCredentialsWidget);//设置样式
scrollArea->setWidget(allCredentialsWidget);//设置滚动
for(int i=0;i<x;i++){
QWidget credentialWidget=new QWidget(allCredentialsWidget);
credentialWidget->setFixedSize(816, 53);
allCredentialsLayout->addWidget(credentialWidget);
}
//设置密码条目底部弹簧
QSpacerItem passbookSpacer = new QSpacerItem(0, 0, QSizePolicy::Minimum, QSizePolicy::Expanding);
//将弹簧加入布局
allCredentialsLayout->addItem(passbookSpacer);
allCredentialsWidget->setLayout(allCredentialsLayout);

qt列表显示多个条目

```c++
//代码片段
    QScrollArea *scrollArea = new QScrollArea(passWidget);
    scrollArea->setFixedSize(836, 266);
    scrollArea->move(0,32);
    scrollArea->setWidgetResizable(true);
    QWidget *allCredentialsWidget=new QWidget(scrollArea);
    allCredentialsWidget->setFixedSize(816, 0);
    scrollArea->setWidget(allCredentialsWidget);
```

![image.png](https://wiki.momen.world/static/img/ee56f20a7f5a75b8669ca22aa9f58708.image.png)
解决方案：QScrollArea边框设为0
`scrollArea->setFrameShape(QFrame::NoFrame);`


![image.png](https://wiki.momen.world/static/img/4162475e1dde4e4fca71a0d91d74ce20.image.png)