Efficient strategy to creative a UIView which is the size of device's screen

Efficient strategy to creative a UIView which is the size of device's screen

Context
I'm creating a UIView to act as the "container view" (let's call it
containerView) for a UIScrollView, this UIScrollView will then house a
UIWebView. See this question for more context. Matching subview's width to
it's superview using autolayout
Goal
Have the containerView, when created, be "full screen", i.e. take up the
whole screen. I can then tie the containerView's size, through auto-layout
constraints to the UIWebView and make the UIWebView, be full width of the
screen.
Questions
What is the best strategy for this? Using [[UIScreen mainScreen]
applicationFrame];