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. ?
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In viewDidAppear:或者viewDidLayoutSubviews中打印才是正常，因?yàn)樵?code>viewDidLoad:, the view is only loaded and not laid out
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