单项选择题
UIViewController在显示过程中,各个方法的调用顺序是()
A.init->viewDidLoad->viewDidAppear->viewDidUnload
B.init->viewDidAppear->viewDidLoad->viewDidUnload
C.init->viewDidLoad->viewDidUnload->viewDidAppear
D.init->viewDidAppear->viewDidUnload->viewDidLoad
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