Qt/C++ : Is "static_cast" ok for casting in this snippet of code?

I am using Qt5 on Windows 7.
In my current app I have the following piece of code that changes the background color of some push-buttons:

...
for(int i = 0; i < layout()->count(); i++)
{
    QPushButton * button = static_cast<QPushButton*>(layout()->itemAt(i)->widget());
    button->setStyleSheet(backgroundColor);
}

Well, I have 2 questions about the above code (1st important, 2nd not so important, if you can bear with me...):

1) Is it ok/correct to use static_cast or should I use some other type of casting?

2) Is it possible to use foreach instead of the for loop above?

Thanks in advance for your precious time and patience :)