我有一个TutorialsViewController，它有一个以编程方式添加的PageViewController:-(void)viewDidLoad{[superviewDidLoad];//Doanyadditionalsetupafterloadingtheview.//Createpageviewcontrollerself.pageViewController=[self.storyboardinstantiateViewControllerWithIdentifier:@"TutorialsPageViewController"];self.pageViewContro