之前用的一种方法是在返回页面里面写的

//点击返回操作后

-(void)viewWillDisappear:(BOOL)animated{

UIStoryboard*story=[UIStoryboardstoryboardWithName:@"Main"bundle:[NSBundlemainBundle]];

ScrollerViewController*mainList=[storyinstantiateViewControllerWithIdentifier:@"mainNavigation"];

if([mainListrespondsToSelector:@selector(popoverPresentationController)]) {

mainList.popoverPresentationController.sourceView=self.view;

}

[self.parentViewControllerpresentViewController:mainListanimated:NOcompletion:nil];

}

后来用的方法是在原页面中

-(void)viewWillAppear:(BOOL)animated{

//设置导航栏宽度

CGRectr = [[UIScreenmainScreen]applicationFrame];

self.navigationItem.titleView.frame=CGRectMake(0,0, r.size.width,40);

//设置页面返回时刷新页面

//获取分类

CommenData*c= [[CommenDataalloc]init];

self.category=[cgetCategory];

indexPage=0;

secondPage=0;

//导航更新

[self.scrollnavilayoutSubviews] ;

[self.scrollnavisetSelectedIndex:indexPage];

//页面布局

[selflayoutSubviews];

//设置按钮

[_setButtonaddTarget:selfaction:@selector(goToSet)forControlEvents:UIControlEventTouchUpInside];

}