vc1.view addsubview vc2.view
then pushviewcontroller vc2 观察生命周期:
vc1.viewdidload
addsubview
pushviewcontroller
vc2.viewdidload
vc1.viewwillappear
vc2.viewwillappear
vc1.viewdidappear
vc2.viewdidappear
vc1.viewwilldisappear
vc2.viewwillappear
vc1.viewDidDisappear
vc2.viewdidappear
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