objective-c - When creating a new viewController, the code prints the width and height of the built-in xib. Why is it different from the actual display on the interface?

Question

When you create a new ViewController, it comes with xib. The width and height of self.view
printed in viewController.m is 600*600, but the interface display effect, constraint layout and the effect of running on the simulator are normal. ?

Answer 1

In viewDidAppear:或者viewDidLayoutSubviews中打印才是正常，因为在viewDidLoad:, the view is only loaded and not laid out